Jaguar Acronyms, Abbreviations & Terms

This glossary was compiled from Jaguar Workshop Manuals, Dealer Training Manuals, Owner’s Manuals, TSBs, new model brochures, press releases, Jaguar web pages, periodicals, the Jaguar Forums, JCNA Concours Manual, etc. Please send any additions or corrections to Don B.


For the sake of brevity I have omitted most easily-understood North American/Queen’s English cognates (aluminum/aluminium, program/programme, vapor/vapour, etc.)

For additional information, see the separate thread of Jaguar Original Equipment Manufacturers (OEM)

Special thanks to KrissMotors for converting the OEM and Acronymns, Abbreviations and Terms lists into a searchable database:

Jaguar Terminology Database

Thanks to the following for contributing terms or corrections to this list: JagV8, H20Boy, Translator, Thermo, JimC64, iscamerica, bdboyle, rocklandjag, theJPster, GrahamPhotog and b1mcp.

+ve = Positive
–ve = Negative
1234yf = HFO-1234yf, new EPA-approved DuPont/Honeywell refrigerant that may replace R-134a
2BBL = Two-barrel carburetor
2DR = Two-door
2OHC = DOHC, Dual- or Double Overhead Cam
2WD = Two-Wheel Drive
420 = Jaguar compact sporting saloon produced 1966-68, also known as the Daimler Sovereign
420G = New name for the Jaguar Mark X large luxury saloon from 1966
4BBL = Four-barrel carburetor
4DR = Four-door
4WD = Four Wheel Drive, selectable 2WD or 4WD system (not to be confused with AWD)
A = Ampere, Amperes; Acceleration
A Bank = (cylinders 1, 3, 5 or 1, 3, 5, 7) (Bank 1, RH Bank)
A-Pillar = A-Post, structure that connects roof to chassis alongside the windshield/screen
A-Post = A-Pillar, structure that connects roof to chassis alongside the windshield/screen
AAC = Auxiliary Air Valve
AAFV = Adaptive Air Flow Value (AMFR)
AAI = Air Assist Injection
AAIV =Air Assist Injection Valve
AAMFR = Adaptive Air Mass Flow Rate (AAFV, AFR, AMFR)
AAT = Ambient Air Temperature Sensor (AATS)
AATS = Ambient Air Temperature Sensor (AAT)
ABC = After Bottom Center, After Bottom Dead Center (ABDC)
ABDC = After Bottom Dead Center, After Bottom Center (ABC)
ABS = Anti-lock Brake System, ABS Control Module
ABS Sensor = Anti-lock Brake System wheel speed sensor (WSS)
ABSSCP = Anti-lock Brake System Speed Control Processor
AC = Alternating Current
AC or A/C = Air Conditioning (AC)
A/C CM = Air Conditioning Control Module (A/C ECU, ATC, CCM, CC ECU)
A/C ECU = Air Conditioning Electronic Control Module (A/C CM, ATC, CCM, CC ECU)
ACC =Accessory, A/C Clutch, Adaptive Cruise/Speed Control, ACC Module (ACCM, ASCM)
ACCM = Adaptive Cruise/Speed Control Module (ACC, ASCM)
Accumulator = Spherical reservoir in which hydraulic fluid is held under pressure (ATE or ACDelco)
ACEA = Association des Constructeurs Européens d’Automobiles, European standards organization
ACJC = Australian Council of Jaguar Clubs
ACM = Audio Control Module or Audio Connectivity Module
ACT = Air Charge Temperature, Air Charge Temp. Sensor (CTS, IAT, IATS, MAT, MCT, VAT)
A/D = Analog-to-Digital (see D/A)
ADAS = Advanced Driver Assistance Systems (see LKA, Mobileye, Gentex)
ADC = Analog-to-Digital Converter (see DAC)
ADC = Active Differential Control, Jaguar EAD system based on GKN Driveline’s ETM (w.s.)
ADCM = Active Dampening Control Module (ADM) (controls CATS/ECATS, part of ASM on X350 & late S-Type)
ADHLS = Axle Deflection Height Level System (LCM)
ADHLS_L = Left Hand Axle Deflection Height Level System (LHLCM)
ADHLS_R = Right Hand Axle Deflection Height Level System (RHLCM)
ADM = Adaptive Damping Module (ADCM) (controls CATS/ECATS, part of ASM on X350 & late S-Type)
ADRC = Adaptive Dampening Ride Control Module
AE = AutoEnginuity, an advanced professional OBD diagnostic system
AEB = Autonomous Emergency Braking
AED = Automatic Enrichment Device
AEM = Active Engine Mount
Aerial = Antenna
Aeroscreen = A low windscreen as often seen on early Jaguar racing cars
AF or A/F = Air Flow, Air/Fuel, Air-Fuel Ratio (AFR), Automatic Frequency Switching (radio)
AF or A/F Across the Flats, wrench size based on fastener head size rather than shaft diameter
AFM = Air Flow Meter (AMS, MAF, MAFS, MAS)
AFR = Air/Fuel Ratio or Air Flow Rate (AAFV, AAMFR, AMFR)
AFSV = Air Flow Sensor Voltage, MAF sensor voltage
Agent, Main = Jaguar Dealer/Dealership
AGM = Absorbed Glass Mat battery, type of VRLA with electrolyte contained in fiberglass mats
Ah = Ampere-Hour, a measure of Quantity of Electricity (Q), a measure of battery capacity
AHB = Automatic High-Beam control
AHCM = Auxiliary Heater Control Module
AHR = Active Head Restraint
AIR = Antipollution Industrial Research, firm of Michael May, designer of HE Fireball cylinder head
AIR = Secondary Air Injection System
Air Cleaner = Air Filter
Air Cleaner Box = Air Filter Housing
Air Filter = Air Cleaner
Air Filter Housing = Air Cleaner Box
Air Mass Sensor = Mass Air Flow Sensor (AFM, MAF, MAFS)
AIRC = Air Injection Check Valve, Secondary Air Injection Check Valve (SAIRC)
AIRP = Air Injection Regenerative Pump, Secondary Air Injection Pump (SAIP)
AKA or a.k.a. = Also Known As
AKI = Anti-Knock Index, fuel performance rating system, same as (R+M/2); see MON, RON
Alfin = ALuminium-FINned brake drums fitted to some XK120s to help overcome brake fade
Allen screw = Set screw, Grub screw
Alligator Clip = Crocodile Clip
Alloy = Aluminum/Aluminium or Magnesium Wheel or Rim
ALR = Automatic Locking Retractor
Alternator = Generator (AC), see Dynamo
Ambla = Vinyl upholstery fabric with expandable knit backing introduced by Jaguar in 1968
Amecoil = AMECA tradename for helical thread insert in Amelock nuts used on many Jaguar axles
Amelock = AMECA trademark for self-locking nut with Amecoil insert, used on many Jaguar axles
AMFR = Air Mass Flow Rate, Adaptive Air Mass Flow Rate (AAFV, AAMFR, AFR)
Amp, Amps = Ampere, Amperes
AMP = Amplifier, Audio Power Amplifier
Ampere = Unit of Electric Current, the measure of electric charge flowing in a circuit (Amps), see Volt
AMRE = Automotive Maintenance & Repair Association, organization behind MAP
AMS = Air Mass Sensor (AFM, MAF, MAFS, MAS)
ANSI = American National Standards Institute Establishes standards such as the UTS (w.s.)
Antenna = Aerial
Anti-clockwise = counter-clockwise
Antipollution Industrial Research = AIR, firm of Michael May, designer of HE Fireball cylinder head
Anti-roll Bar = Anti-sway bar, sway bar, stabilizer bar, torsion bar
Anti-sway Bar = Anti-roll bar, sway bar, stabilizer bar, torsion bar
AP = Accelerator Pedal
API = American Petroleum Institute, trade assoc. that establishes motor oil stds.; see ILSAC, ACEA
APP = Accelerator Pedal Position Sensor
APP1= Accelerator Pedal Position Sensor Resistive Element 1
APP2 = Accelerator Pedal Position Sensor Resistive Element 2
ARB = See CARB
ARC = Active Roll Control
ARHUD = Augmented Reality Head-Up Display (see HUD, LHUD)
ARM = Automatic Restraint Module or Adaptive Restraint Module
Armature = The rotating coil in a generator or electric motor; crash-reinforcement plate in a bumper
ARTS = Adaptive Restraint Technology System
ASC = Adaptive Speed Control, Adaptive Speed/Cruise Control Module (ASCM, ACC, ACCM)
ASCM = Adaptive Speed/Cruise Control Module (ACC, ACCM)
ASE = Automotive Service Excellence, National Institute for Automotive Service Excellence
ASL = Automatic Speed Limiter
ASLS = Automatic Speed Limiter Switch
ASM = Air Suspension Module (ASCM, ASU)
ASME = American Society of Mechanical Engineers Establishes standards such as the UTS (w.s.)
Aspect Ratio = Ratio of height to width, esp. ratio of a tire’s section height divided by its section width
ASU = Air Suspension Control Unit (ASCM, ASM)
ASME = American Society of Mechanical Engineers, establishes various industrial standards
ASIS = Adaptive Shift Strategy (TCM shift strategy adaptation based on driving style)
AT, A/T = Automatic transmission
ATC = Automatic Transmission Control or Automatic Temperature Control (see DATC)
ATC = Automatic Temperature Control Module ( A/C CM, A/C ECU, ATCM, CCM, CC ECU)
ATCISO = Automatic Temperature Control ISO bus
ATC = After Top Center, After Top Dead Center (ATDC)
ATCM = Automatic Temperature Control Module (A/C CM, A/C ECU, ATC, CCM, CC ECU)
ATDC = After Top Dead Center, After Top Center (TC)
ATF = Automatic Transmission Fluid
ATMC = Automotive Training Managers Council
ATO Fuse = Standard-size two-blade or spade automotive fuse patented in 1976 by Littelfuse (w.s.)
AUDIO = Audio Unit, Audio Control Unit
Auto Parts Store = Motor Factor
Autobahn = Freeway, Highway, Interstate, Main Road, Motorway, Parkway
Autocalf = Grade of Connolly Leather with embossed grain (see Autolux, Vaumol)
A/V = Audio Visual or Audio/Video
Autolux = Premium grade of Connolly Leather, extra supple with little discernible grain (see Autocalf)
AVC = Automatic Volume Control
AVOM = Analog Volt/Ohm Meter
AWD = All Wheel Drive, all four wheels driven at all times (not to be confused with 4WD)
AWS = Anti-Whiplash System
B Bank = Ccylinders 2, 4, 6 or 2, 4, 6, 8; Bank 2; LH Bank
B+ = Battery Positive Voltage, Vbat
B-Pillar = B-Post, narrow structure that connects roof to body behind the front door
B-Post = B-Pillar, narrow structure that connects roof to body behind the front door
Backlight = Rear windscreen/windshield
Badge = Emblem, Medallion; brand, as in Daimler or Vanden Plas
Ballast Resistor = A device that limits the amount of current in an electric circuit
Bank 1 = A Bank; RH Engine cylinder bank (cylinders 1, 3, 5, 7)
Bank 2 = B Bank; LH Engine cylinder bank (cylinders 2, 4, 6, 8)
Bar = Unit of pressure; 1 bar = 100,000 Pa or = 14.5 psi
BAR = Beyond All Repair (see FUBAR)
BARO = Barometric Pressure Sensor
BAT = Battery
BBC = Before Bottom Center, Before Bottom Dead Center (BBDC)
BBDC = Before Bottom Dead Center, Before Bottom Center (BBC)
BBL = Barrel, or orifice, as in 1BBL, 2BBL or 4BBL carburetor
BBS = Germany-based manufacturer of some OE Jaguar wheels
BC = Bottom Center, Bottom Dead Center (BDC)
BDC = Bottom Dead Center, Bottom Center (BC)
Bellows = Tube suggesting a bellows in form, as seen in air intakes, cruise control actuators, etc.
Bezel = A mount, holder or decorative trim for a gauge, lamp, air vent, shifter, switch, door handle, etc.
BFH = Big F**king Hammer, a bashing tool used to “persuade” a stuck part
BHP = Brake Horsepower, Engine power measured by the resistance of an applied brake
Bimetallic Strip = Band of two dissimilar metals bonded together that bends when heated or cooled
Bimetallic Switch = A thermal switch based on the movement of a bimetallic strip, such as an
BIPM = Bureau International des Poids et Mesures, Int’l Bureau of Weights and Measures (IBWM)
Bitumen = Asphalt, sticky black liquid or semi-solid form of petroleum used in insulating materials
Bitumen Board = Black weatherproof board with high bitumen content used in Jaguar interiors
Bearing = Machine part that constrains relative movement and reduces friction between moving parts
BL = British Leyland, (BLMC) result of 1968 merger of British Motor Corp. and Leyland Motor Corp.
Black Box = Flight Data Recorder, data recorder built into ECM (first introduced on X-Type)
BLMC = British Leyland Motor Corporation, result of 1968 merger of BMC and LMC (w.s.)
Bluetooth = International short-range radio standard to replace cables between electronic components
BMC = British Motor Corporation; result of 1952 merger of Austin and Morris
BMH = British Motor Holdings, result of 1966 merger of Jaguar with British Motor Corp. (w.s.)
Bodge = Botch, make a mess of
Body Stripe = Coach Line, Pin Stripe
Boot = Gaiter, a covering of rubber, plastic, or leather that protects against dust & other contamination
Boot = Trunk
Bolster = Trim panel or finishing panel (see Knee bolster, Scuttle, Underscuttle)
Bonnet = Hood
Bolt = An externally-threaded headed fastener used in conjunction with a nut. (see Screw)
Bore Wash = Cylinder Wash (w.s.)
Botch = Bodge, make a mess of
Bottle Cap = Castellated retainer for Jaguar axle castle nuts that resembles a Coke- or beer bottle cap
Bottom Dead Center = Position of piston when it is closest to crankshaft
Box End Wrench or Box Wrench = Ring Spanner
BPM = Body Processor Module, Body Processor Unit (BPU, CPU on XJ40 and earlier cars )
BPMISO = Body Processor Module ISO bus
BPP = Brake Pedal Position, Brake Pedal Position Switch or Sensor
BPU = Body Processor Unit, Body Processor Module
Breaking Capacity = Current at which a fuse melts; Imax, Interrupting Rating, Short-Circuit Rating
British Imperial = System of measurement units: Inch, Foot, Yard, Mile, Quart, Gallon, Pound (SAE)
British Leyland = (BL), result of 1968 merger of BMC and LMC (w.s.)
British Motor Corp. = (BMC), merged with Jaguar in 1966 to form BMH (w.s.)
British Motor Holdings = (BMH), result of 1966 merger of Jaguar with BMC (w.s.)
British Standard Whitworth = Imperial unit-based thread measurement standard
Brooklands = Twin-aeroscreen arrangement on early Jaguar racing cars
Browns Lane = Post-WWII Jaguar factory in Allesley, Coventry, England
Brush Nylon = Headliner fabric used on Jaguars from 1971 to present
BSD = Blind Spot Detection
BT = Bluetooth
BTC = Before Top Center, Before Top Dead Center (BTDC)
BTDC = Before Top Dead Center, Before Top Center (BTC)
BTU = British Thermal Unit
BTW = “By the way” (OBTW)
BSA = Birmingham Small Arms Co., from whom Jaguar acquired Daimler Co. Ltd. in 1960
Bulkhead = Firewall
Bump = A forum message intended to move a thread to the front page to keep it active
BUS, Communications = A circuit for communication among electronic modules
BUS, Ground/Earth/Common = A common circuit to which multiple components connect
Bush/Bushing, Metal, Ceramic or Plastic = A plain Bearing with no moving parts
Bush/Bushing, Rubber = A vibration isolator, flexible mounting or antivibration mounting
Butterfly Valve = Circular plate in the throttle body that controls flow of intake air
C = Carbon, Cold, degrees Centigrade/Celsius, Capacitance in Farads
C = Coupe or Coupé, as in XJ12C
C-Pillar = C-Post, structure that connects roof to body behind the rear door
C-Post = C-Pillar, structure that connects roof to body behind the rear door
C-Type = Jaguar racing car produced 1951-53, Le Mans winner 1951 & 1953 (also called XK120-C)
CAAT = Council of Advanced Automotive Trainers
CAD = Computer Aided Design
Cadmium = Chemical element Cd, used as a corrosion-resistant coating on Jaguar fasteners & hardware
CAF = Current Air Flow
CAFÉ = Corporate Average Fuel Economy standards mandated by the U.S. government
Callum, Ian = Jaguar Design Director from 1999, responsible for X350, XK (2006), XF, XJ (2010)
Cam Cover = Protective cap on overhead-cam (OHC) engine, see Valve Cover
CAN = Controller Area Network, Bosch-designed comm. protocol (see CAN ISO 15765)
CAN ISO 15765 = Bosch protocol required on all U.S. cars from 2008 (see CAN, ISO 15765 CAN)
Capacitor = Condensor, device that can store electric charge and block DC
Car Park = Parking Lot
Carb = Carburetor, Carburator, Carburettor, Caburetter
CARB = California Air Resources Board, establishes standards that impact automakers worldwide
Castle Bromwich = Birmingham, U.K. factory where Jaguar XF, XJ, XK and F-Type are assembled
Castle Nut = Nut with castellated notches on top for alignment with a Cotter Pin hole in axle or shaft
Castellated Retainer = “Bottle Cap,” retainer for Jaguar axle castle nuts that resembles a beer bottle cap
CAT = Catalytic Converter, Catalyst
Catalytic Converter = Catalyst (CAT)
Catalyst = Catalytic Converter or its active element (e.g. Platinum, Palladium, Rhodium) (CAT)
CATS = Computer Active Technology Suspension system (Jaguar adaptation of Wabco ECAS)
CBS = Crankcase Breathing System (EBS)
CC = Climate Control or Cruise Control (SC, Speed Control)
cc = cubic centimeter, (cm³), 1/1000 Liter/Litre, 1 cc = 1 ml, a unit of volume or displacement
CCA = Cold Cranking Amperes
CCM = Climate Control Module (A/C CM, A/C ECU, ATC, ATCM, CC ECU)
CCM = Carbon-Ceramic Matrix brakes
CCMCAN = Climate Control Module CAN communications bus
CC ECU = Climate Control Electronic Control Module (A/C CM, A/C ECU, ATC, ATCM CCM)
CCRG = Critical Concerns Review Group, JLR committee that investigates potential recalls (see FRG)
CCV = Coolant Control Valve (DCCV, DCFV, HCV, HWCV, HV, WV)
CCV = Canister Close Valve, EVAP Canister Close Valve
CD = Compact Disc, or in reference to a carburetor, constant depression
CDC = Compact Disc Changer
CDL = Central Door Locking
CDMA = Code Division Multiple Access mobile telephony protocol (see GSM)
CEI = Constant-Energy Ignition, Lucas ignition system employed on Jaguar V12 engines (LCEI)
CEL = Check Engine Light or Lamp (EML, MIL, SEL, SES)
Celstran = Celanese brand of LFRT Polypropylene used in many modern Jaguar components
CFC = Chlorofluorocarbon, such as R-12 refrigerant (see HFC)
cfm or CFM = Cubic Feet Per Minute
CGI = Compacted Graphite Iron (used in 2.7L diesel engine block)
Channellock Pliers = Water pump pliers, slip-joint pliers, tongue-and-groove pliers
Cheers = To wish someone well, thanks, or a formal salutation
CHT = Cylinder Head Temperature
CID = Cubic Inch Displacement, 1 Liter =61.0237 cubic inches
CIP = Cold Inflation Pressure
Circlip = Notched circular flat spring-steel retainer to fit in a slot around a shaft, clevis pin, etc.
CJB = Central Junction Box
CJLR = Chery Jaguar Land Rover Automotive Company Ltd. based in Changshu, China
CKP = Crankshaft Position Sensor (CKPS, CPS) (Jaguar adopted the acronym CKPS from X300 on)
CKPS = Crankshaft Position Sensor (CKP, CPS) (Prior to X300 Jaguar used the acronym CKP)
CL = Closed Loop, ECM controlling fueling in reaction to O2S feedback (see OL)
Clevis Pin = Headed metal dowel fastener with a hole for a Cotter Pin or slot for a Circlip on the end
Clockspring = Device that carries electrical signals to steering wheel components (e.g.airbag, switches)
Closed Loop = ECM controlling fueling in reaction to O2S feedback (CL) (see OL)
CM = Control Module
cm³ = cubic centimeter (cc), 1/1000 Liter/Litre, 1 cc = 1 ml, a unit of volume or displacement
CMM = Column Memory & Mirror Control Module
CMP = Camshaft Position Sensor (CMPS)
CMP 1 / A = Camshaft Position Sensor 1 / A / RH Bank
CMP 2 / B = Camshaft Position Sensor 2 / B / LH Bank
CMPS = Camshaft Position Sensor (CMP)
CMS = Catalyst Monitor Sensor
CO = Carbon Monoxide
CO Meter = Carbon Monoxide Meter
CO2 = Carbon Dioxide
Coach Line = Pin Stripe, Body Stripe
Coast = Freewheel
Code = Diagnostic Trouble Code or Fault Code
Coil-on-Plug = Each spark plug is fitted with its own ignition coil (COP, On-Plug Ignition Coil)
Common = Circuit to which multiple components connect, Ground/Earth circuit
COMP = Compass
Condenser = Front A/C heat exchanger in which gaseous refrigerant condenses to liquid, releasing heat
Condensor = Capacitor, device that can store electric charge and block DC
Connecting Rod End = Tie Rod End, Track Rod End (steering)
Connellize, Connellizing = misspellings of Connollize, Connollizing
Connollize, Connollizing = Process of colouring or re-colouring leather, named for Connolly Leather
Convertible = Drophead
COP = Coil-on-Plug Electronic Ignition (On-Plug Ignition Coil)
Core Plug = Freeze Plug
Cotter Pin = Split Pin
Cotton Bud = Cotton swab, Q-tip
Cotton Swab = Cotton Bud, Q-tip
Counter-clockwise = anti-clockwise
Coupe or Coupé = A passenger car, traditionally with two doors, but we now see “four door coupes”
Coventry = England headquarters of Jaguar Cars and now Jaguar Land Rover
Cowl = Trim or finisher at base of windshield/rear of hood, steering column finisher, a scuttle
CPCM =Cellular Phone Control Module (CPM)
CPM = Cellular Phone Module (CPCM)
Cps = Cycles-per-second, Hertz 1 cps = 1 Hz
CPS = Crankshaft Position Sensor (CKP, CKPS)
CPU = Central Processing Unit (BPM on X300 and later ???? )
CPV = Canister Purge Valve, Evaporative Emissions Canister Purge Valve (EECPV)
Crank Pulley Damper = Crankshaft Damper, Harmonic Balancer or Damper, Vibration Damper
Crankshaft Damper = Crank Pulley Damper, Harmonic Balancer or Damper, Vibration Damper
CRLP = Current Run Line Position
Crocodile Clip = Alligator Clip
Crosshead Screwdriver = Phillips Screwdriver
Crossmember = Subframe
Crown Wheel = Ring Gear
Cruise Control = Speed Control
CSA = Canada Standards Association
CSI = Cold Start Injector
CSTS = Cold Start Thermotime Switch
CT = Closed Throttle or Coolant Temperature, Engine Coolant Temperature (ECT)
CTA VCT = BorgWarner Cam Torque Actuated Variable Camshaft Timing system
CTP = Current Throttle Position or Closed Throttle Position
CTS = Coolant Temperature Sensor (ECT)
CTS = Charge Temperature Sensor (ACT, IAT, IATS, MAT, MCT, VAT)
C-Type = Jaguar racing car produced 1951-53, Le Mans winner 1951 & 1953 (also called XK120-C)
Cubby Box = Glove Box or Glove Compartment
Curb = Kerb
Curb Side = Side nearest the curb for a RHD car, farthest from the curb for a LHD car
Current, Electric = Rate of flow of electric charge in a circuit (Ampere, Amp) see Voltage
CUV = Crossover Utility Vehicle (see F-Pace)
CV Joint = Constant-velocity joint
Cycles-per-second = Unit of frequency, (Hertz, Hz), 1 cps = 1 Hz
Cyl = Cylinder
Cylinder Wash, Washing, Washdown = Loss of compression due to fuel washing oil from the cylinder
C-X17 = Crossover Utility Vehicle concept on which the Jaguar F-Pace CUV is based (X761)
D = Drive or Daimler
D2B = Digital Data Bus Network, telematics network (fiber/fibre optic; optical fiber)
D-Jetronic = Bosch EFI system, man. by Lucas for Jaguar V12 engines (superseded by Digital P)
D-Pillar = D-Post, structure rearward of C-pillar that connects roof to body, as on an estate car
D-Post = D-Pillar, structure rearward of C-pillar that connects roof to body, as on an estate car
D-Type = Jaguar racing car produced 1954-57, Le Mans winners 1955, ’56 and ‘57
D-Washer Round washer with a flat-sided center hole that resembles the letter D
D/A = Digital-to-Analog
DAC = Digital-to-Analog Converter
DAMB = Direct-Acting Mechanical Bucket tappets
DATC = Dual Automatic Temperature Control, Dual Electronic Automatic Temperature Control
DAB = Digital Audio Broadcast
Daimler = Daimler Co. Ltd., acquired by Jaguar in 1960 from BSA (not Daimler-Benz or Daimler AG)
Daimler Double Six = U.K. badge for 12-cylinder version of XJ40 saloon (XJ12 in the U.S.)
Daimler Sovereign = Jaguar compact sporting saloon produced 1966-68, also known as the Jaguar 420
Da Vina = An advanced computer-based OBD diagnostic system
Damper = Shock Absorber
Damper, Crankshaft = Crank Pulley Damper, Harmonic Balancer or Damper, Vibration Damper
Dash = Dashboard, Facia, Facia Panel
Dashboard = Dash, Facia, Facia Panel
Data Link Connector = The vehicle OBDII connector port (DLC)
DATC = Dual Automatic Temperature Control system
dB = Decibels Unit of sound energy (SPL), electrical power ratio, or ratio of two voltages or currents
DB = Driveshaft Balancer
DBW = Drive-by-wire
DC = Direct Current or Duty Cycle
DCCV = Dual Coolant Control Valve (CCV, DCFV, DFCV, HCV, HWCV, HV, WV)
DCFV = Dual Coolant Flow Valve (DCCV, DFCV, CCV, HCV, HWCV, HV, WV)
DD = Daily Driver
DDM =Driver Door Module, Driver Door Control Module
Dead Battery = Flat Battery
Dead Pedal = Stationary rest for driver’s left foot (position may be adjustable)
Dealer/Dealership, Jaguar = Jaguar Main Agent
DEF = Defrost, Defog
Delamination = Separation or splitting of layers of laminated wood in Jaguar steering wheels and panels
Denatured alcohol = Methylated spirit
Department of Transportation = Ministry of Transport (DOT, MOT)
Detonation = Combustion of end-gas after normal combustion (see Pre-ignition, Misfire, Knock)
Dewis, Norman, OBE = Chief Jaguar test driver and development engineer from 1952-1985
DEXRON, DEXRON II, DEXRON III =Automatic Transmission Fluid trademark of GM
DFCV = Dual-flow Coolant Valve (CCV, DCCV, DCFV, HCV, HWCV, HV, WV)
DHC = Drophead or Drop Head Coupe, convertible version of a 2-door coupé (see OTS, Roadster)
DHM = Driver’s Head Restraint Module
DI = Direction Indicators, Indicators, Turn Signals
Diaphragm = Flexible membrane separating two cavities, as in a carburetor or hydraulic accumulator
Diaphragm = A flexible disc that vibrates when receiving or producing sound (microphone or speaker)
DIC = Digital Instrument Cluster (Jaguar terminology: Virtual Instrument Cluster)
Diesel Cycle = Thermodynamic cycle invented by Rudolph Diesel (see Otto Cycle)
Diff = Differential (w.s.)
Differential = A gear set that transmits driveshaft power to the axles, typically offset by 90-degrees
Differential Gear Ratio = The number driveshaft/propshaft rotations for each wheel rotation
Digital P = Bosch/Lucas EFI system that replaced D-Jetronic on XJ-S from 1980
DIN = Deutches Institut für Normung, “German Institute for Standardization,” German ISO body
DIN Connector = Standardized electrical connector such as the circular format used for audio signals
Direction Indicators = Indicators, Turn Signals (DI)
Discs = Brake rotors
Divided Highway = Dual Carriageway
DIY = Do It Yourself
DLC = Data Link Connector (the vehicle OBDII connector port)
DMM = Digital Multi-Meter, for measuring voltage, resistance, and more (see VOM, DVOM)
DMS = Driver Monitoring System, Driver Attention-Monitoring System by Seeing Machines & Intel
DMV = Department of Motor Vehicles (U.S. States)
DOHC = Dual or Double Overhead Camshaft (see OHC, Twin Cam, Twin OHC)
Downstream = Later/following in a circuit/system, as in Downstream O2S (Post Cat) (see Upstream)
Door Card = Door Interior Trim Panel
Door-Cap = Top trim piece of door card, often incorporating wood veneer and/or leather in Jaguars
DOT = Department of Transportation, Ministry of Transport (MOT)
Double-Six = 12-cylinder Jaguar XJ saloon
DPF = Diesel Particulate Filter
DPO = Despised Previous Owner of one’s Jaguar
Draught Excluder = Moquette-covered trim for door and sunroof opening edges, Weather Seal/strip
DRDM = Driver Rear Door Control Module; Driver Side Rear Door Module
Driveshaft = Propshaft, Propeller Shaft
DRL = Daytime Running Lights
Drophead = Convertible
Drophead Coupe = Convertible version of a 2-door coupe or coupé, see Roadster (DHC)
DS= Driver’s Side, Near Side (DS, NS), see Passenger Side
DSC = Dynamic Stability Control, Electronic Stability Control (ESC), DSC Module (DSCM)
DSCM = Dynamic Stability Control Module (DSC, ESC); Driver Seat Control Module (DSM)
DSM = Driver’s Seat Control Module or Diagnostic Status Manager (ECM system that triggers DTCs)
DSO = Digital Storage Oscilloscope
DSP = Digital Signal Processing
DTC = Diagnostic Trouble Code (Fault Code, Code)
DTMF Tones = Dual Tone Multi-Frequency tones (related to in-car telephony)
D-Type = Jaguar racing car produced 1954-57, Le Mans winners 1955, ’56 and ‘57
Dual Carriageway = Divided highway
Dumpy Screwdriver = Stubby Screwdriver, short screwdriver
DVD = Digital Versatile Disc
DVOM = Digital Volt/Ohmmeter
Dynamo = Generator (DC), see Alternator
Dynamometer = “Dyno,” apparatus for measuring force, torque and power of an engine or powertrain
Dyno = Dynamometer, apparatus for measuring force, torque and power of an engine or powertrain
E = Electric Field
E2PROM = Electrically Eraseable Programmable Read-Only Memory (see EEPROM)
E-Type = Jaguar range of sports cars produced from 1961 to 1975, E-Type in the U.K., XK-E in the U.S.
EAD = Jaguar Electronic Active Differential (GKN Driveline’s ETM, w.s.)) (ADC)
EAV = Extra Air Valve
Earth = Ground (see Common)
Earth Bus = Ground Bus, circuit to which multiple components are Earthed/grounded
EBA = Emergency Brake Assist
EBD = Electronic Brake force Distribution system
EBS = Engine Breathing System (CBS)
ECAS = Wabco adaptive air suspension system on which Jaguar CATS and ECATS are based
ECATS = Jaguar Enhanced Computer Active Technology Suspension system (based on Wabco ECAS)
ECM = Engine Control Module (ECU, PCM)
ECMSCP =Engine Control Module Speed Control Processor
Econoseal = Electrical connectors by Tyco Int’l used in many Jaguars (now TE Connectivity)
ECT = Engine Coolant Temperature, Engine Coolant Temperature Sensor (CT, CTS, ECTS)
ECTS = Engine Coolant Temperature Sensor (CT, CTS, ECT)
ECU = Electronic Control Unit, any of several control modules (ABS, CCM, ECM, TCM, etc.)
ECU = Engine Control Unit (ECM, PCM)
EDIS = Ford Electronic Distributorless Ignition System, often retrofitted to classic Jaguars
EECPV = Evaporative Emissions Canister Purge Valve (CPV)
EEPROM = Electrically Eraseable Programmable Read-Only Memory (E2PROM)
EFI = Electronic Fuel Injection (see FI)
EFT = Engine Fuel Temperature, Engine Fuel Temperature Sensor (EFTS, FT, FTS)
EFTS = Engine Fuel Temperature Sensor (EFT, FTS)
e.g. = exempli gratia (Latin); for example, for the sake of example, such as
EGR = Exhaust Gas Recirculation, EGR Valve
EGR Valve = Exhaust Gas Recirculation Valve (EGRV)
EGRC = Exhaust Gas Recirculation Cooler
EGRT = Exhaust Gas Temperature Sensor (EGRTS, EGT, EGTS)
EGRTS = Exhaust Gas Temperature Sensor (EGRT, EGT, EGTS)
EGRV = Exhaust Gas Recirculation Valve (EGR Valve)
EGT = Exhaust Gas Temperature Sensor (EGRT, EGRTS, EGTS)
EGTS = Exhaust Gas Temperature Sensor (EGRT, EGRTS, EGT)
Electrochromic = Jaguar rear view mirrors by Gentex that dim electronically (see Photochromic)
Electromotive Force = Potential difference between terminals of a source of electrical energy
ELM = An OBD scanning device made by ELM Electronics
ELM327 = OBDII interpreter, Bluetooth scanning device that pairs with the Torque Pro Android app
ELM329 = CAN-only interpreter by ELM Electronics
EM = Engine Management
Emblem = Badge, Medallion
EMC = Electro-Magnetic Interference Control
Emergency Brake = Hand Brake, Handbrake, Parking Brake
EMI = Electromagnetic Interference caused by EMR (see RFI)
EML = Engine Management Lamp or Light (CEL, MIL, SEL, SES)
EMR = Electromagnetic radiation: e.g. radio waves, visible light, etc. (see EMI, RFI, IR, UV)
EMS = Engine Management System
Engine Speed = Rotational speed of engine in rpm, as opposed to Vehicle Road Speed
England, Raymond “Lofty” = ‘50s Jaguar Racing Chief, Jaguar Chairman & Chief Executive 1971-74
Enleanment = The AFR becoming leaner due to ECM action or another cause (e.g. air leak)
Enrichment = The AFR becoming richer due to ECM action or another cause (e.g. clogged air filter)
Entrance Ramp = On Ramp, Slip Road entering a motorway
EOBD = European On Board Diagnostics, equivalent to OBDII, mandatory on petrol cars from 2001
EOBD2 = Marketing-speak for enhanced features beyond OBDII or EOBD requirements
EOC = Engine Overspeed Control, ECM cancellation of fuel injection to prevent engine overspeed
EOP = Engine Oil Pressure or Engine Oil Pressure Sensor
EOT = Engine Oil Temperature or Engine Oil Temperature Sensor (EOTS, OT, OTS)
EOTS = Engine Oil Temperature Sensor (EOT, OT, OTS)
EPA = Environmental Protection Agency (U.S.)
EPAS = Electric Power Assisted Steering
EPB = Electric/Electronic Park/Parking Brake (appears in all permutations in Jaguar literature)
EPB Module = Electric/Electronic Park/Parking Brake Module (PBM)
EPC = Jaguar Electronic Parts Catalog
EPROM = Eraseable Programmable Read-Only Memory (see EEPROM)
ESC = Electronic Stability Control, Dynamic Stability Control (DSC)
Escutcheon = An ornamental plate or trim ring around a keyhole, door handle, switch, etc.
ESD = Electrostatic Discharge
ESP = Electronic Stability Program, Bosch technology used in some Jaguars
Estate Car = Shooting-brake, Station Wagon
ETM = Engineering Test Mode
ETM = GKN Driveline’s Electronic Torque Manager differential, Jaguar’s EAD and basis of ADC
E-Type = Jaguar range of sports cars produced from 1961 to 1975, E-Type in the U.K., XK-E in the U.S.
EU = European Union
EVAP = Evaporative Emissions, EVAP Management System (Fuel Vapor/Vapour Management)
EVAP =Canister Evaporative Emissions Carbon/Charcoal Canister
EVAP =Canister Close Valve Evaporative Emission Canister Close Valve
EVAP = Canister Purge Valve Evaporative Emission Canister Purge Valve
EVAPP = Evaporative Emission Control Purge Valve
Evaporator = A/C heat exchanger inside vehicle in which liquid refrigerant boils to gas, absorbing heat
EWP = Electric Water Pump
Exit Ramp = Off Ramp, Slip Road leaving a motorway
Expansion Tank = Header tank (coolant)
EXT = External (as in external air temperature)
Eyelet Terminal = Ring Terminal
F = Force; degrees Fahrenheit
Facelift = Superficial changes to a current model (see also Redesign)
Facia = Facia Panel, Dash Panel, Dashboard
Facia Panel = Facia, Dash Panel, Dashboard
Fault Code = Diagnostic Trouble Code or “Code”
FAQ = Frequently Asked Questions
FCC = Federal Communications Commission (U.S.)
FEA = Finite Element Analysis, computer study of how a material or design will perform under stress
FEAD = Front End Accessory Drive belt
Fender = Wing
Fender Skirts = Spats
FEM = Front Electronic Module, Front Electronic Control Module
FETM = Front Entertainment Control Module, Front Seat Entertainment Control Module
FFH = Fuel Fired Heater
FHC = Fixed-head coupe, hardtop 2-door coupe with non-removable roof
FI = Fuel Injector or Fuel Injection, petrol injection (PI), see EFI, MFI
Fibremod = LGF polypropylene plastic used in F-Type IP and airbag chute (see Borealis & Borouge)
Final Drive = Mechanism that changes power transmission direction 90 degrees (Pinion & Ring Gear)
Final Drive Ratio = Number of engine rotations for each wheel rotation in a given transmission gear
Firewall = Bulkhead
FIS = Fuel Injection Strategy
FIPC = Fuel Injection Primary Control
FISC = Fuel Injection Secondary Control
Fixed-Head Coupe = Hardtop 2-door coupe (FHC)
Flashlight = Torch
Flat Battery = Dead Battery
Fleece = Lambswool, as used in OE and aftermarket Jaguar rugs or overmats
Flex Disc = (Flexible Coupling, Giubo, Jurid) as incorporated in many Jaguar driveshafts/propshafts
Flex Plate = Connects engine output to torque converter input on car with auto trans (see Flywheel)
Flexible Coupling = Flex Disc, Giubo or Jurid as incorporated in many Jaguar driveshafts/propshafts
Flight Data Recorder = Black Box, data recorder built into ECM (first introduced on X-Type)
FLS = Fuel Level Sensor
Flyover = Overpass
Flywheel = Connects engine output to clutch on car with manual transmission (see Flex Plate)
FMEM = Failure Mode Effect Management (TCM maintains maximum function in the event of a fault)
FMFR = Fuel Mass Flow Rate, Adaptive Fuel Mass Flow Rate
FMVSS = Federal Motor Vehicle Safety Standards (U.S.)
FOB = The security and locking remote control portion of an automotive key
Foot-Pounds = Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Pound-Feet, Nm, N·m, Newton-metre)
Ford = Ford Motor Company, owner of Jaguar Motorcars 1989-2008, OEM of many Jaguar parts
F-Pace = Jaguar’s upcoming Crossover Utility Vehicle (CUV)
FP = Fuel Pump
FPaid = Front Parking Aid
FPCV = Fuel Pressure Control Valve
FPDB = Front Power Distribution Box, Front Power Distribution Fuse Box
FPR = Fuel Pressure Regulator or Fuel Pump Relay
FPS = Fuel Pressure Sensor
Freeway = Autobahn, Highway, Interstate, Main Road, Motorway, Parkway
Freewheel = Coast
Freeze Plug = Core Plug
Freon = Registered trademark of DuPont applied to R-12 refrigerant used in older A/C systems
FRG = Field Review Group, JLR internal committee that reviews potential recalls per CCRG (w.s.)
FRP = Fuel Rail Pressure or Fuel Rail Pressure Sensor
FSU = Fuel Supply Unit
FTP = Fuel Tank Pressure Sensor
FT = Fuel Trim, Fuel Temperature
ft. lb. or ft·lb = Foot-pounds, unit of torque (lb.ft., lb·ft., Pound-Feet, Nm, N·m, Newton-metre)
FTLT= Fuel Trim Long Term
FTS = Fuel Temperature Sensor (EFT, EFTS)
FTST = Fuel Trim Short Term (STFT, SHRTFT)
F-Type = Jaguar sports car range produced from 2013
FUBAR = F**ked Up Beyond All Repair (see BAR)
Fuel Wash = Cylinder Wash
Furflex = Moquette-covered rubber piping or U-channel clip-on edge trim or “draught excluder”
Fuse = Current-sensitive device that melts under current overload to protect other circuit components
FVCV = Fuel Volume Control Valve
FWD = Front Wheel Drive (see RWD)
g/sec = Grams-per-second, unit of airflow measured by the MAFS
Gaiter = Boot, a covering of rubber, plastic, or leather that protects against dust & other contamination
gal or GAL = Gallon(s)
Gallon, Imperial or British Imperial = 4.546 Liters = 1.2 U.S. Liquid Gallon
Gallon, U.S. Liquid Gallon = 3.79 Litres = 0.8337 Imperial Gallon
Gas = Gasoline, Petrol; any gaseous substance
Gasket = Rubber, plastic, metal, leather or cloth seal for mating surfaces between two or more parts
Gasoline = Fuel, Petrol
Garage = Shop, Repair Shop
Gaydon = Jaguar Land Rover Gaydon Centre, principal engineering headquarters
GDO = Garage Door Opener
Gearbox = Transmission, Trans, Trannie, Box
Gedore = Germany-based OEM of adjustable wrenches in Jaguar tool kits
Gel Cell = Type of VRLA battery in which silica dust is added to the electrolyte to form a paste
GEM = Generic Electronic Module, Bosch ECU for ZF Servotronic electronic steering racks
Generator = Alternator (AC) or Dynamo (DC)
Girling, Albert H. = Inventor of SS & Jaguar drum and disc brake systems manufactured by Lucas
Giubo = Flex Disc, Flexible Coupling, Jurid, named for inventor Giunti Boschi, often misspelled Guibo
Global Opening/Closing = Opening/closing all doors, windows, sunroof/moonroof with key or remote
Glove Box = Glove Compartment or Cubby Box
Glove Compartment = Glove Box or Cubby Box
GND = Ground, Earth
GOR = Grille Opening Reinforcement
GPC = Glow Plug Control
GPC = Glow Plug Control Module
GPL = Glow Plug Lampe
GPS = Global Positioning System (Sat Nav) (see NAV, NCM)
Grommet = Ring or eyelet, often a rubber ring that protects wires passing through a hole in a metal part
Ground Bus = Earth Bus, circuit to which multiple components are grounded/Earthed
Ground = Earth (see Common)
Grub screw = Allen screw, Set screw
GSM = Group Spécial Mobile/Global System for Mobile Communications mobile telephony standard
GT = Grand Touring car, a 2-door in the coupe/convertible style designed for comfort and high speed
GTR = Global Technical Resource, Jaguar onine resource for dealers and technicians, now TOPix
Gudgeon Pin = Wrist Pin, piston-to-connecting rod pin
Guibo = Misspelling of Giubo
GVW = Gross Vehicle Weight
GWM = Gateway Module
GYRO = Gyroscope, Gyroscopic Sensor
H = Hot
Half-axle = Half-shaft, Sideshaft, connects differential, transaxle or transfer case/box to wheel
Half-shaft = Half-axle, Sideshaft, connects differential, transaxle or transfer case/box to wheel
Hall Effect = Voltage generated in a conductor carrying an electric current when near a magnetic field
Hall Effect Sensor = A sensor that uses the Hall Effect to provide a variable electric signal
Hand Brake = Handbrake, Emergency Brake, Parking Brake
Hardura = Jute felt-backed grain-embossed PVC vinyl-faced material used for Jaguar interior parts
Harmonic Balancer = Crankshaft Damper, Crank Pulley Damper, Harm. Damper, Vibration Damper
Harmonic Damper = Crankshaft Damper, Crank Pulley Damper, Harm. Balancer, Vibration Damper
Harness = Loom Wiring Harness
Harrison = Brand of A/C compressors used in some Jaguars (frmly. Div of AC Delco, now Delphi)
Hassan, Walter “Wally” = Ex-Bentley engineer who helped design the Jaguar Twin-OHC XK engine
HC = Hydrocarbons
HCM = High Speed CAN Network Module
HCV = Heater Control Valve (DCCV, DCFV, CCV, HWCV, HV, WV)
HD = Heavy Duty
Header = Exhaust manifold
Header Tank = Expansion tank (coolant)
Heat Exchanger Transfers heat from one fluid to another: radiator, oil cooler, intercooler, condenser
HE = Hall Effect or High Efficiency
HEGO = Heated Exhaust Gas Oxygen sensor (O2S, HO2, HO2S, Lambda Sensor, UHEGO)
HEI = High-Energy Ignition
Hertz = Unit of frequency, cycles-per-second, (Hz), 1 Hz = 1 cps
HES = Hall Effect Sensor
Heynes, William “Bill” = Principal designer of the Jaguar Twin-OHC XK engine, with Wally Hassan
HFC = Hydrofluorocarbon, such as R-134a refrigerant (see CFC)
HFO-1234yf = New EPA-approved DuPont/Honeywell refrigerant that may replace R-134a (1234yf)
HFS = Heated Front Screen (see HRS)
Hg = Mercury (see inHg)
HID = High Intensity Discharge, High Intensity Discharge Headlamp
Hide = Leather used in Jaguar interiors (see Autolux, Autocalf)
High Tension Leads = Spark Plug Cables or Wires
Highway = Autobahn, Freeway, Interstate, Main Road, Motorway, Parkway
HLM = Headlamp Leveling Module
HMI = Human Machine Interface
HMSL = High Mounted Stop Lamp
HO2 = Heated Oxygen Sensor (HEGO, HO2S, O2, O2S, Lambda Sensor, UHEGO)
HO2S = Heated Oxygen Sensor (HEGO, HO2, O2, O2S, Lambda Sensor, UHEGO)
HO2 Sensor 1 / 1 = Heated Oxygen Sensor – RH Bank or Bank 1 / Upstream
HO2 Sensor 1 / 2 = Heated Oxygen Sensor – RH Bank or Bank 1 / Downstream
HO2 Sensor 2 / 1 = Heated Oxygen Sensor – LH Bank or Bank 2 / Upstream
HO2 Sensor 2 / 2 = Heated Oxygen Sensor – LH Bank or Bank 2 / Downstream
Hood = Bonnet, or convertible top
HP = Horsepower, a measure of power. 1 HP = 550 foot-pounds per second, or 745.7 watts
HRS = Heated Rear Screen (see HFS)
HS = High Speed
HSMO = Hydraulic System Mineral Oil
HSW = Heated Steering Wheel
HT or H.T. = High Tension
HT Leads = Spark Plug Cables or Wires
HU = Head Unit, Audio/Video System Head Unit
Hubcap = Nave Plate
HUD = Head-Up or Heads-Up Display (see ARHUD, LHUD)
HVAC = Heating Ventilation and Air Conditioning
HWCV = Heater Water Control Valve (DCCV, DCFV, CCV, HV, WV)
HWP = Heated Wiper Park
HYCYOSTY = “Have you changed your original secondary tensioners yet?” (X308 necessity)
Hz = Hertz, unit of frequency, cycles-per-second, 1 Hz = 1 cps
I = Symbol for Current in electronics equations
I6 = Inline six-cylinder engine, Straight Six engine
IA = Intake Air
IAC = Idle Air Control or Idle Air Control Valve (IACV), see also ISC, ISCM, ISSM
IACV = Idle Air Control Valve (IAC), see also ISC, ISCM, ISSM
IAT = Intake Air Temperature, Intake Air Temperature Sensor (IATS, ACT, CTS, MAT, MCT, VAT)
IATS = Intake Air Temperature Sensor (IAT, ACT, CTS, MAT, MCT, VAT)
IBWM = Int’l Bureau of Weights and Measures, Bureau International des Poids et Mesures (BIPM)
IC = Instrument Cluster (INST, IP, IPK, ICCM), Internal Combustion, Industry/Industrie Canada, integrated circuit
ICCM = Instrument Control Center Module (IC, INST, IP, IPK)
ICE = In-Car Entertainment System
ICM = Ignition Control Module (ICU)
ICU = Ignition Control Unit (ICM)
ID or I.D. = Identification, or Inside Diameter (see OD)
Idle = Tick Over, or the engine speed at idle
IDM = Injector Driver Module
IDS = Integrated Diagnostic System, Ford/JLR computer-based diagnostics (See PDU, SDD, WDS)
i.e. = id est (Latin): that is, that is to say
IFS = Independent Front Suspension
IG = Ignition
IGN = Ignition
IIABDFI = “If It Ain’t Broken Don’t Fix It” (IIIBDFI)
IIRC = “If I recall correctly”
IIIBDFI = “If It Isn’t Broken Don’t Fix It” (IIABDFI)
ILSAC = Int’l Lubricant Standardization & Approval Committee, motor oil standards, see ACEA, API
Imax = Current at which a fuse melts; Breaking Capacity, Interrupting Rating, Short-Circuit Rating
Impeller = Bladed rotor for transmitting motion to a fluid, as in a water pump, torque converter, etc.
Imperial = British Imperial measurement units: Inch, Foot, Yard, Mile, Quart, Gallon, Pound (SAE)
IMT = Intake Manifold Tuning Valve (see VIS)
IMT = Valve Intake Manifold Tuning Valve; Valve 1 = Top, Valve 2 = Bottom
IMHO = In my humble opinion
IMO = In my opinion
IMT = Intake Manifold Tuning Valve, LH or RH (LHIMT, RHIMT)
In Good Nick = In good condition
Indicators = Direction Indicators, Turn Signals, Signals (DI)
inHg = Inches of Mercury, unit of pressure, measure of engine manifold vacuum, 1 inHg = 3386.389 Pa
Inline Six = Straight Six engine (I6)
INST = Instrument Cluster, Instrument Pack (IC, IP, IPK, ICCM)
Interactive Voice = Jaguar voice-recognition control system
Interstate = Autobahn, Freeway, Highway, Main Road, Motorway, Parkway
Interrupting Rating = Current at which a fuse melts; Imax, Breaking Capacity, Short-Circuit Rating
Int’l = International
I/O = Input/Output
IP = Injection Pressure, Injector Pressure Sensor, Fuel Injection Pressure Sensor
IP or I/P = Instrument Pack or Panel (IC, ICCM, INST, IPK)
IPC = Ignition Primary Control (see ISC)
IPD = Injector Pulse Duration (On Time, Pulsewidth, Pulse Width)
IPDA = Definition not yet known, probably diesel-related; from p. 208 of X350 Owner’s manual
IPR = Ignition Positive Relay
IPS = Injection Pressure Sensor, Fuel Injection Pressure Sensor
IPK = Instrument Pack (IC, ICCM, INST, IP)
IR = Infrared, radiant energy/EMR with wavelengths longer than visible light (see EMR, UV)
IRS = Independent Rear Suspension, Jaguar’s, designed by Bob Knight, is one of the world’s best
IS = Inertia Switch, Intrusion Sensor or Intrusion Sensor Module (ISM)
ISC = Idle Speed Control (see also IAC, IACV, ISCM, ISSM)
ISC = Ignition Secondary Control (see IPC)
ISCM = Idle Speed Control Motor (ISSM), see also ISC, IAC, IACV
ISM = Intrusion Sensor Module (IS)
ISR = Idle Speed Reference
ISSM = Idle Speed Stepper Motor (ISCM), see also IAC, IACV, ISC, ISCM)
ISO = International Standards Organization, establishes various industrial standards
ISO = Serial Data Link Network (ISO 9141)
ISO Relay = Relay conforming to ISO automotive relay standards (ISO, Mini ISO & Micro ISO sizes)
ISO 9001 = Fundamental quality management systems & standards for automotive makers & suppliers
ISOFIX = Child safety seat restraint system
ISO 15765 CAN = Bosch protocol required on all U.S. cars from 2008 (see CAN, CAN ISO 15765)
ISO/TS 16949 = Quality assurance standard for OEM parts suppliers that superseded QS9000
ISO 9141 = Serial Data Link Network
ISU = International System of Units (SI)
ITA = Ignition Timing Advance (measured in degrees)
IVT = In-Vehicle Temperature, In-Vehicle Temperature Sensor (see IVTH, IVTS, IVTHS)
IVTH = In-Vehicle Temperature and Humidity, In-Vehicle Temperature and Humidity Sensor
IVTHS = In-Vehicle Temperature and Humidity Sensor (IVT, IVTH, IVTS)
IVTS = In-Vehicle Temperature Sensor (see IVT, IVTH, IVTHS)
JADE = Jaguar Alive Driving Experience
JAG = Jaguar Association Germany
JagNet = Vehicle Emergency Messaging System (VEMS)
JaguarSport = Joint venture between Jaguar and TWR to create the XJ40 XJR models
JaguarVoice = Voice Activated Control system, see VAC, VACM
JCCT = Jaguar Car Club of Tasmania
JCNA = Jaguar Clubs of North America
JDC = JaguarDrive Control, Jaguar Driver’s Club
JDCA = Jaguar Driver’s Club of Australia
JDCSA = Jaguar Driver’s Club of South Australia
JDHT = Jaguar Daimler Heritage Trust
JDS = Jaguar Diagnostic System
JGM = J-Gate Module, gear selector module
JDS = JaguarDrive Selector
JIL = Jaguar Innovation Lab, fictional laboratory featured in Jaguar television commercials
j/k = Just kidding
JLR = Jaguar Land Rover
JLRA = Jaguar Land Rover Australia
JOBD = Japan On Board Diagnostics, a version of OBDII for vehicles sold in Japan
JOC = Jaguar Owners Club
JPCS = Jaguar Pedestrian Contact Sensing
JPDA = Jaguar Performance Driving Academy
JSS = Jaguar Sequential Shift
JTB = Jaguar Technical Bulletin (TSB)
JTIS = Jaguar Technician Information System, computer-based Workshop Service Manuals
JTRS = Jaguar Tyre Repair System
Jubilee Clamp or Clip = Worm-drive hose clamp, generic term derived from U.K.-based Jag OEM Jubilee
Jump = Jump Start, Boost
Jump Leads = Jumper Cables, Booster Cables
Jump Start = Boost, to supplement a dead/flat battery by connecting to the battery of another vehicle
Jumper Cables = Jump Leads, Booster Cables
Jurid = Flexible Coupling, Flex Disc, Giubo; named for the early manufacturer Jurid Werke (w.s.)
K = degrees Kelvin
KAM = Keep Alive Memory
KC = Knock Control
KD = Kick Down or Kickdown
KDS = Kick Down or Kickdown Switch
Kerb = Curb
Kerosene = Paraffin
KERS = Kinetic Energy Regeneration System
Key, Woodruff = Half-moon shaped tab that aligns and connects a gear or pulley to a drive shaft
Kg = Kilogram, unit of mass commonly also used as unit of weight, 1000 grams, 1 kg = 2.2 pounds
kHz = kilo-Hertz, one-thousand Hertz, one-thousand cycles per second
Kickdown = Wide Open Throttle accompanied by a gear downshift for overtaking/passing
Kickdown Switch = Usually associated with Accelerator Pedal mechanism, initiates Kickdown
Kilogram = kg, unit of mass commonly also used as unit of weight, 1000 grams, 1 kg = 2.2 pounds
KISS = Keep It Simple, Stupid
km/h = Kilometers Per Hour (see mph)
kmpl = Kilometers Per Litre, a measure of fuel economy (see mpg, l/100km)
Knight, Robert “Bob” = Master Jaguar chassis engineer, designer of the renowned Jaguar IRS
Knock = Audible indication of Misfire, Detonation or Pre-ignition
Knockoffs, Octagonal “Safety” = Wheel hub nuts fitted to wire-wheeled Jaguars from 1968
Knockoffs, “Two-earred or winged” = Rudge-Whitworth hub nuts fitted to wire-wheeled Jags to 1968
Knuckle = Suspension component that locates front stub axle or rear hub (see Steering Knuckle)
KOEO = Key On, Engine Off
kPa = Kilopascal(s), 1 kPa = 1000 Pascals
KS = Knock Sensor or Knock Sensing; KS 1 = RH Bank or Bank 1; KS 2 = LH Bank or Bank 2
KTM = Key Transponder Module
kV = Kilovolt(s), 1 kV = 1000 Volts
KWP = Keyword Protocol (a form of OBD)
L = Liter or Litre, unit of volume or displacement, 1 L = 1.05669 qt. or 61.0237 cubic inches
L = Long Wheel Base as in XJ8L (LWB)
L/100km = Litres Per 100 Kilometers, a measure of fuel economy (see mpg, kmpl)
Lag = Delay in response to an input, such as Fuel Injector Lag
Lambda (λ) = Air-Fuel Equivalence Ratio = AFR/Stoichiometric AFR (for gasoline/petrol 1λ = 14.7:1)
Lambda Sensor = Oxygen Sensor (O2, O2S, HO2, HO2S)
Lambswool = Fleece, as used in OE and aftermarket Jaguar rugs or overmats
Lawson, Geoff = Jaguar Design Director 1989-1999 (XJ220, X300, XK8, S-Type, X-Type)
lb. = Pound, unit of weight, 1 pound = 0.453592 kilogram
lb. ft. or lb·ft = Pound-Feet, unit of torque (ft. lb., ft·lb, Foot-Pounds, Nm, N·m, Newton-metre)
LCD = Liquid Crystal Display
LCEI = Lucas Constant-Energy Ignition, ignition system employed on Jaguar V12 engines (LCEI)
LCM = Level Control Module (ADHLS), Lamp Control Module or Lighting Control Module
Lead Substitute = Added to unleaded fuel to reduce valve seat wear in engines designed for leaded fuel
Lean = AFR with too much air and/or too little fuel, Lambda (λ) > 1 (see Rich)
Leaper = The Jaguar leaping cat trademark, especially in hood/bonnet ornament form
LED = Light-Emitting Diode
Leyland Motor Corp. = LMC, merged with BMH in 1968 to form British Leyland (w.s.)
LFRT = Long-Fiber Reinforced Thermoplastic, used in many Jaguar parts (Celstran)
LGF = Long Glass Fiber (used to reinforce plastics, see Fibremod, Borealis and Borouge)
LH = Left Hand, Left Hand Side, typically referenced from the driver’s seat facing forward
LHD = Left Hand Drive
LHIMT = Left-Hand Intake Manifold Tuning Valve, (see IMT, RHIMT)
LHLCM = Left Hand Level Control Module (ADHLS L)
LHM = Limp Home Mode, permits driving while reducing risk of engine or transmission damage (RP)
LHUD = Laser Head-Up Display (see ARHUD, HUD)
LHS = Left Hand Side, typically referenced from the driver’s seat facing forward
License Plate = Number Plate
Limp Home Mode = Restricted performance, impaired transmission function due to a fault (LHM, RP)
Limp Mode = Limp Home Mode
Liter / Litre = L or l, unit of volume, 1 L = 1.05669 qt.
LKA = Lane-Keeping Assistance (see ADAS, Mobileye, Gentex)
LKAS = Lane-Keeping Assistance and Support (see ADAS, Mobileye, Gentex)
Lock Washer = Spring Washer, Helical Spring Lock Washer
LONGFT = Long Term Fuel Trim (FTLT, LTFT)
Loom = Wiring Harness, Harness
Lorry = Truck
LPG = Liquefied Petroleum Gas or Liquid Petroleum Gas
LSD = Limited-Slip Differential
LTAI = Long Term Adaptive Idle (see also STAI)
LTFT = Long Term Fuel Trim (FTLT, LONGFT)
LTI = Long Term Idle adaptation (see STI)
Lug Nut = Wheel Nut
LUMP = “Less Upkeep More Power,” slogan of Chevy engine conversion advocates
Luxan = Dye-enhanced-grain grade of Connolly Vaumol leather (see Autolux, Autocalf)
LW = Long Waveband (see MW)
LWB = Long Wheel Base, indicated by “L” in model name, such as XJ6L (see SWB, WB)
Lyons, Sir William = “Mr. Jaguar,” co-founder of Jaguar Cars with William Walmsley
M = Meter/Metre
M = Mass; U.S. terminology of SE version of XK120
M = Position Memory set button (for seats, steering wheel, pedals, exterior mirrors, etc.)
MACS = Mobile Air Conditioning Society
MAF = Mass Air Flow Sensor (AFM, AMS, MAFS, MAS)
MAFS = Mass Air Flow Sensor (AFM, AMS, MAF, MAS)
mA·h or mAh = milliamp-hour, 1/1000 of an ampere-hour, unit of battery power/discharge interval
Main Agent, Jaguar = Jaguar Dealer/Dealership
Main Road = Autobahn, Freeway, Highway, Interstate, Motorway, Parkway
MAP = Manifold Absolute Pressure Sensor or Motorist Assurance Program (AMRE)
Mark 1 = Jaguar 2.4L and 3.4L saloons produced 1955-59 (known as Mark 1 after Mark 2 introduced)
Mark 2 = MK 2, Jaguar medium-sized saloon produced 1959-67
Mark V = Pronounced “Mark Five,” large Jaguar luxury saloon produced 1948-51
Mark VII = Pronounced “Mark Seven,” large Jaguar saloon produced 1951-56, successor to Mark V
Mark VIII = Pronounced “Mark Eight,” large Jaguar saloon produced 1956-58, successor to Mark VIII
Mark IX = Pronounced “Mark Nine,” large Jaguar saloon produced 1959-61, successor to Mark IX
Mark X = “Mark Ten,” full-size Jaguar saloon produced 1961-70, renamed 420G in 1966
MAS = Mass Airflow Sensor (AFM, AMS, MAF, MAFS)
Mass = Amount of matter in a body, does not vary with altitude but commonly equated with Weight
MAT = Manifold Air Temperature Sensor (ACT, CTS, IAT, IATS, MCT, VAT)
MAX = Maximum
May Fireball Engine = Michael May designed High-compression stratified charge V12 HE head (AIR)
May, Michael = Designer of Jaguar V12 HE high-compression stratified charge cylinder head (AIR)
MCCM = Message Control Center Module
MCP = Multimedia Control Panel
MCT = Manifold Charge Temperature Sensor (ACT, CTS, IAT, IATS, MAT, VAT)
Mechatronics = Field combining mechanical, electrical, telecomm, control & computer engineering
Medallion = Bade, Emblem
Mega Fuse = Fuse with a very high Imax
MegaSquirt = Customizable aftermarket EFI control system by Bruce Bowling and Al Grippo
MEM = Memory, as in stored radio station, seat position, etc.
Metalastik = Trademarked rubber/metal bonded anti-vibration isolation bushes by Trelleborg AB
Meter, Metre = m, Unit of length, 1 m = 39.3701 inches or 1.09361 yards
Methylated spirit = Denatured Alcohol
Metre, Meter = m, Unit of length, 1 m = 39.3701 inches or 1.09361 yards
MFI = Mechanical Fuel Injection
MIL = Malfunction Indicator Lamp (CEL, EML, SEL, SES)
Milometer or Mileometer = Odometer (ODO)
MIN = Minimum
Mini-lite = U.K.-based maker of alloy wheels retro-fitted to classic racing Jaguars
Ministry of Transport = Department of Transportation (MOT, DOT
Misfire = Combustion failure in a cylinder due to malfunction with fuel, spark, timing, etc.
Mistry, Cyrus P. = Current Chairman of the Tata Group, including Tata Motors/JLR
MK 2 = Mark 2, Jaguar medium-sized saloon produced 1959-67
Ml = milliliter/milliliter, 1/1000 Liter/Litre, 1 ml = 1 cc, a unit of volume or displacement
ML/kM =Mile/kilometer selector for instrument panel display units
mm = millimeters
Mohair = Angora goat fleece textile used in classic Jaguar convertible tops & tonneaus (Wigan cloth)
Mole Grips Pliers = Vise Grips Pliers
MON = Motor Octane Number, a fuel performance rating system; see RON, (R+M/2), AKI
Mongoose = OBDII-to-USB serial communications gateway adapter cable for use with JLR SDD
Monocoque = Unibody
Moonroof = Roof window with a glass panel that may or may not open to the air (see Sunroof)
Moquette = Short-nap woolcloth with velour-like surface used in Jag interiors and on draught excluders
MOT = Ministry of Transport, Department of Transportation (MOT, DOT)
Moto-Lita = U.K.-based maker of classic wood-rim OE and aftermarket Jaguar steering wheels
Motor Factor = Auto Parts Store
Motorway = Autobahn, Freeway, Highway, Interstate, Main Road, Parkway
Montreal Protocol = Int’l treaty on ozone protection effective 1989 that prompted R-12 phase-out
mpg = Miles Per Gallon, a measure of fuel economy (see kmpl, l/100km)
mph = Miles Per Hour (see km/h)
MPS = Manifold Pressure Sensor
MSDT = Material Safety Data Sheet
MT or M/T = Manual Transmission
MTBE= Methyl Tertiary Butyl Ether, an oxygenate used to enhance unleaded fuel octane rating
ms = Millisecond, 1 ms = 1/1000 second
Muffler = Silencer
mV = millivolt(s), 1 mV = 1/1000 volt
MW = Medium Waveband (see LW)
MY = Model Year
N = Neutral or Nitrogen
NA or N/A =Normally (or Naturally) Aspirated (as opposed to Supercharged or SC), or Not-Applicable
NATEF = National Automotive Technician’s Education Foundation
NAV = Navigation System, Navigation Control Module (NCM, GPS)
Nave Plate = Hubcap
NAS = North American Specification
NC or N.C. = Normally Closed (see NO)
NCM = Navigation Control Module (NAV)
Near Side = Driver’s Side (NS, N/S, DS), see Off Side
New Old Stock = Unused older manufacture as opposed to modern reproduction (NOS)
Newton Metre = Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Foot-Pounds, Pound-Feet, Nm, N·m)
NHTSA = National Highway Travel Safety Administration (U.S.)
NIASE = National Institute for Automotive Service Excellence, commonly known by ASE
Nick, In Good Nick = In good condition
Nikasil = Electrodeposited lipophilic nickel matrix silicon carbide; problematic cylinder coating
NLA = No Longer Available (seen in Jaguar parts listings)
Nm or N·m = Newton-metre Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Foot-Pounds, Pound-Feet)
NO or N.O. = Normally Open (see NC)
NOS = New Old Stock, unused older manufacture as opposed to modern reproduction
NOX or NOx = Oxides of Nitrogen, collectively Nitrogen Monoxide (NO) & Nitrogen Dioxide (NO2)
NS or N/S = Near Side
NSD = Neutral Sense Diode
NTC = Negative Temperature Coefficient
Number Plate = License Plate
Nut = An internally-threaded fastener, typically with a hex-shaped perimeter, used with a bolt or stud.
NVH = Noise, Vibration and Harshness
Nyloc Nut = Nut with a deforming Nylon insert that resists loosening due to vibration or shaft rotation
Nylock = Misspelling of Nyloc
Nylon = DuPont trademark for family of aliphatic polyamide thermoplastics first produced in 1935
Nylon, Brush = Brush Nylon headliner fabric used in Jaguars from 1971 to present
O2 = Oxygen, at STP, two atoms bind to form dioxygen, with the chemical formula O2
O2S = Oxygen Sensor (O2, HO2, HO2S, Lambda Sensor)
O2S, Narrowband = Older sensor that responds to narrow AFR range, Lean/Stoic/Rich
O2S, Wideband = Newer sensor that responds to wide AFR range and eliminates lean-rich cycling
OBD = On Board Diagnostics
OBD I = On Board Diagnostics, first generation CARB standards, implemented on Jaguars 1991-’94
OBD II = On Board Diagnostics, second generation CARB standards, implemented on Jags from 1995
OBTW = “Oh, By The Way” (BTW)
O/C = Open Circuit
OCC = Oil Catch Can
OCS = Occupant Classification System
OCSCM = Occupant Classification Sensor Control Module (seat weight sensor)
OD or O.D. = Outside Diameter (see ID)
O/D or OD = Overdrive
ODO = Odometer, milometer or mileometer
Odometer = Milometer or mileometer (ODO)
ODST= On Demand Self Test (a function in IDS, WDS or SDD)
OE = Original Equipment, part or component fitted to new vehicles at Jaguar factory
OEM = Original Equipment Manufacturer/Manufacture, may be Jaguar or a third party vendor
OFC = Overrun Fuel Cutoff, ECM cancellation of fuel injection during engine overrun conditions
Off Ramp = Exit Ramp, Slip road leaving a motorway
Off Side = Passenger Side (OS, O/S, PS), see Near Side
OHC = Overhead-cam, design used on Jaguar engines, see SOHC, DOHC, OHV
OHV = Overhead-valve engine design, see OHC
Oil Pan = Sump
OL = Open Loop, ECM controlling fueling based on stored maps rather than O2S feedback (see CL)
On Ramp = Entrance Ramp, Slip Road entering a motorway
On Time = Duration of fuel injector opening, controlled by ECM (IPD, Pulsewidth, Pulse Width)
On-Plug Ignition Coil = Each spark plug is fitted with its own ignition coil (COP)
OP = Original Poster or Post in a forum thread
Open Loop = ECM controlling engine by stored fueling maps rather than O2S feedback (OL) (see CL)
OPUS = Oscillating Pick-Up System, Lucas ignition system employed on Jaguar V12 engines
ORVR = On-Board Refueling Vapor/Vapour Recovery (part of the X308 EVAP system)
OS or O/S = Off Side, passenger side (see Near Side), or Oxygen Sensor
OSH = Oxygen Sensor Heater
OSS = Occupancy Sensing System
OT = “Off Topic;” Oil Temperature or Oil Temperature Sensor (EOT, EOTS, OTS)
OTS = Oil Temperature Sensor (EOT, EOTS, OT); Other Than Sedan; Open Two-Seater
Otto Cycle = 4-stroke thermodynamic cycle used in most gas/petrol auto engines (see Diesel Cycle)
Overmat = Footwell rug or carpet mat
Overpass = Flyover
Overrider or Over Rider = Projection mounted to bumper to prevent interlocking with another vehicle
OZRA = Upgraded version of GM400 automatic transmission used in Jaguar XJR-S[/CODE][CODE]
P = Park; Power in Watts
Pa = Pascal or Pascals
PACM = Parking Aid Control Module (PAM)
PAD = Passenger Airbag Deactivation (lamp)
PADi = Passenger Airbag Deactivation indicator lamp, PAD lamp
PAG = Polyalkylene Glycol (oil), a principal lubricant for air conditioning compressors
PAM = Parking Aid Module (PACM)
Paraffin = Kerosene
Parking Brake = Hand Brake, Handbrake, Emergency Brake
Parking Lot = Car Park
Parkway = Autobahn, Freeway, Highway, Interstate, Main Road, Motorway
PAS = Parking Aid System, Power-Assisted Steering (PS)
PASCM = Power-Assisted Steering Control Module (Servotronic, Servotronic 2, VAPS)
Pascal = (Pa), Unit of pressure, one newton per square metre; 1 Pa = 0.00001 bar or = 0.000145 psi
Passenger Side = Off Side (PS, OS), see Driver’s Side
PATS = Passive Anti-Theft System
PB or P/B = Power Brakes, Power-assisted Brakes (PAS)
PBA = Panic Brake Assist
PBM = Parking Brake Module (EPB)
PCB = Printed Circuit Board
PCM = Powertrain Control Module (ECM, ECU)
PCMISO = Powertrain Control Module ISO bus
PCMPTEC = Powertrain Control Module, Security (PATS), Throttle Electronics Module
PCSS = Pedestrian Contact Sensing System
PCV = Positive Crankcase Ventilation
PDBS = Pedestrian Deployable Bonnet System
PDC = Park Distance Control, Park Distance Control Sensor
PDI = Pre-Delivery Inspection (performed by Jaguar dealer)
PDM = Passenger Door Control Module
PDU = Portable Diagnostic Unit, a Jaguar dealer-level diagnostic tool (see IDS, SDD, WDS)
PDWA Valve = Pressure Differential Warning Actuator valve, activates brake pressure warning lamp
PECUS = Programmable Electronic Control Units (market specific ECU variants)
Petrol = Petroleum Spirit, Fuel, Gasoline
Phillips Screwdriver = Crosshead Screwdriver
PHM = Passenger Head Restraint Module
Photochromaic = Misspelling of Photochromic
Photochromatic = Misspelling of Photochromic
Photochromic = Rearview mirror that auto-dims in response to ambient light (see Electrochromic)
PI = Petrol injection, fuel injection, radio Program Identification
Pico = Powerful automotive diagnostics system from Pico Technology
PID = Parameter ID
PIN = Personal Identification Number
Pinpoint Diagnostic = Measurement of a specific conductor or circuit (e.g. voltage, resistance, short)
Pin Stripe = Coach Line, Body Stripe
PJB = Passenger Junction Box
PKE = Passive Keyless Entry
Plinth = A supporting device, such as a bumper plinth or number plate plinth, a mount
PM = Particulate Matter, Private Message or Private Mail Message
PN or P/N = Part Number
PN or P-N = Park Neutral Switch (PNP, PNS)
PNP = Park-Neutral Position, Park-Neutral Position Switch
PNS = Park-Neutral Switch (PN, P-N, PNP, PNS)
PO = Previous Owner of one’s Jaguar
Poly Bush = Suspension bushing made with polyurethane for reduced flex and increased durability
Porcelain Enamel = Vitreous Enamel: fused powdered-glass coating on some Jaguar exhaust manifolds
POS = Position, “Piece of S**t”
Post Cat = Mounted after the Catalytic Converter (Downstream) (see Pre Cat)
Pound = lb., unit of weight, 1 pound = 0.453592 kilogram
Pound-Feet = Unit of torque (ft.lbs., ft·lb, lb.ft., lb·ft, Foot-Pounds, Nm, N·m, Newton-metre)
Powr-Lok = Dana/Spicer heavy-duty Limited Slip Differential used in some Jaguars
Pozidrive = Crosshead screw similar to Phillips designed to reduce slipping of the screwdriver
PPS = Pedal Position Sensor
PPTY = Priority Program Type (see PTY)
PRDM = Passenger Rear Door Control Module; Passenger Side Rear Door Module
PRV = Pressure Retaining Valve
Pre Cat = Mounted before the Catalytic Converter (Upstream) (see Post Cat)
Pre-ignition = Ignition of air-fuel mixture prior to spark plug firing (see Detonation, Misfire, Knock)
Prince of Darkness, The = Nickname for Lucas Industries based on perceived lack of reliability
Prise = Pry
Propeller Shaft = Propshaft, Driveshaft
Propshaft = Propeller Shaft, Driveshaft
Potentiometer = Potentio Meter, 3-terminal variable resistor used as voltage divider, volume control, etc.
Proud = Raised, stands above surrounding surface, “To stand proud of…”
Pounds-per-square-inch = (psi or p.s.i.), unit of pressure; 1 psi = 0.0689475729 bar or 6894.75729 Pa
ppm = Parts-per-million
PRV = Pressure Relief Valve (part of air spring/shock absorber assembly)
Pry = Prise
PS = Power-Assisted Steering (PAS), or Passenger Side (w.s.)
psi or p.s.i. = Pounds-per-square-inch, unit of pressure; 1 psi = 0.0689475729 bar or 6894.75729 Pa
PSE = Phone Support Equipment
PSM = Passenger Side Module; Passenger Seat Control Module
pt. = Pint
PTC = Positive Temperature Coefficient fluid temperature sensor (in some transmissions)
PTEC or PTec = Engine Management System by Visteon used on 2000-02 S-Type 3.0L & 4.0L
PTFE = Polytetrafluoroethylene, a high-molecular-weight plastic known by the brand name Teflon
PTU = Portable Test Unit (e.g. an IDS, WDS or SDD computer system)
PTY = Program Type (see PPTY)
PTY31-ALARM = Radio broadcast emergency alert message that overrides regular programming
Pulsewidth = Duration of signal to open fuel injector, controlled by ECM (IPD, On Time, Pulse Width)
Pulse Width = Duration of signal to open fuel injector, controlled by ECM (IPD, On Time, Pulsewidth)
PWM = Pulse Width Modulation, Pulse Width Modulated
PWR = Power-to-Weight Ratio, horsepower-per-pound, see WPR
Q = Quality factor; Quantity of electricity in Ampere-Hours
Q-tip = Cotton Bud, Cotton Swab
qt. or Qt. = Quart, unit of volume, 1 qt. = 0.946353 L
Quarter Window = Quarterlight, vent window
Quarterlight = Quarter window, vent window
QS9000 = Quality assurance standard for OEM parts suppliers, superseded by ISO/TS 16949
R = Reverse; Resistance in Ohms
(R+M/2) = Fuel octane or performance rating derived from average of RON and MON (AKI)
R-12 = DuPont Freon CFC refrigerant used in auto A/C systems, phased out after Montreal Protocol
R-134a = Refrigerant 134a, tetrafluoroethane (C2H4F4), HFC refrigerant that replaced R-12
R-152a = Refrigerant 152a, difluoroethane (C2H4F2), may replace R-134a in autos (see HFO-1234yf)
RAM = Random Access Memory
RATC = Rear Automatic Temperature Control Module (not to be confused with RCCM)
RCM = Restraints Control Module or Resistance Deployment Control Module
RCCM = Remote Climate Control Module (not to be confused with RATC)
RCCP = Rear Climate Control Panel
RLCM = Rear Lighting Control Module
RCMISO = Resistance Deployment Control Module ISO bus
RCMSCP = Resistance Deployment Control Module Secondary Control Processor
RDS = Radio Data System(s)
RECM = Rear Electronic Control Module (REM)
RECP = Rear Entertainment Control Panel
Redesign = Major design and engineering changes to an auto model (see also Facelift)
Reluctor = Sensor Ring, sensor rotor, trigger wheel
REM = Rear Electronic Module (RECM)
Resonator, Helmholtz = Tuned chamber designed to reduce noise, especially in exhausts or air intakes
Restricted Performance = Limited transmission and/or engine function due to a fault (LHM, RP)
RETM = Rear Entertainment Control Module, Rear Seat Entertainment Control Module
Rev = Reverse or Revolution
Rev Counter = Revolution Counter, Tachometer, Tach or TACH
Revolution Counter = Rev Counter, Tachometer, Tach or TACH
Rexine = Thin early forerunner of vinyl used on XK140 and earlier interiors (see vynide)
RF = Radio Frequency
RFI = Radio Frequency Interference (see EMR, EMI)
RH = Right Hand, Right Hand Side, typically referenced from the driver’s seat facing forward
RHD = Right Hand Drive
Rheostat = A two-terminal variable resistor used to control current, as in a light dimmer
Rheostat Switch = A combination rheostat and On/Off switch
RHIMT = Right-Hand Intake Manifold Tuning Valve, (IMT, LHIMT)
RHLCM = Right Hand Level Control Module (ADHLS R)
RHS = Right Hand Side, typically referenced from the driver’s seat facing forward
Rich = AFR with too little air and/or too much fuel, Lambda (λ) < 1 (see Lean)
Rimbellisher = Decorative trim ring for outer rim of wheel, often chrome plated
Ring Gear = Crown Wheel (in differential), or Starter Gear on flywheel or flex plate
Ring Terminal = Eyelet Terminal
Ring Spanner = Box End Wrench or Box Wrench
RKE = Remote Keyless Entry
RME = Rapeseed Methyl Ester, a biodiesel fuel produced from low erucic acid varieties of canola seed
RMM = Rear Memory Module
Roadster = Non-hardtop coupe, may or may not have a convertible top or hood
Rocker Cover = Protective cap on overhead-valve engine, Valve Cover, see Cam Cover
Rocker Panel = Sill
ROM = Read-Only Memory
RON = Research Octane Number, a fuel performance rating system; see MON, (R+M/2), AKI
Roots = A Roots-type supercharger or blower, positive displacement lobe pump
Rotor = Brake disc or distributor rotor
ROW = Rest of World, Rest of the World Specification
RP = Restricted Performance, permits driving while reducing risk of engine or trans damage (LHM)
RPaid = Rear Parking Aid
RPDB = Rear Power Distribution Box, Rear Power Distribution Fuse Box
rpm or RPM = Revolutions Per Minute
RS = Road Speed, typically expressed in mph o km/h (VS, VRS)
RSE = Rear Seat Entertainment
RSIS = Rear Seat Infotainment System
RSM = Rear Seat Module, Rear Seat Control Module, Rear Head Restraint Module
RTFM = Read the f**king manual
RTM = Read the manual
Rug = Footwell rug, overmat or carpet
RWD = Rear Wheel Drive (see FWD)
RWHP = Rear Wheel Horsepower
S-Type (Classic) = Jaguar saloon produced 1963-68
S-Type (Modern) = (X200-206) 1999-2008 Saloon on Ford DEW98 platform (Lincoln LS/Ford Thunderbird)
SAE = Society of Automotive Engineers, establishes standards such as motor oil grades, OBDII port
SAE J1850 PWM = Ford Motor Company OBDII standard, pulse-width modulation, 41.6 kB/s
SAE Measurement Units = System based in part on British Imperial units: Inch, Foot, Yard, Mile
SAI = Secondary Air Injection
SAIRC = Secondary Air Injection Check Valve (AIRC)
SAIP = Secondary Air Injection Pump (AIRP)
Saloon = A full-size passenger car, a Sedan
SAS = Secondary Air Status
Sat Nav = Satellite Navigation (GPS) (see NAV, NCM)
Sayer, Malcolm = Aerodynamicist and designer of Jaguar C-, D- and E-Types and XJ-S
SC = Speed Control (CC, Cruise Control)
SC or S/C = Supercharger, Supercharged engine (as opposed to Normally Aspirated or N/A)
SCLM = Steering Column Lock Module or Security and Locking Control Module (SLM)
Scope = Shorthand for oscilloscope, endoscope, the graphic display of a live data scanner, etc.
SCP = Standard Corporate Protocol Network
Screen = Windscreen/Windshield
Screw = Externally-threaded headed fastener that threads into the material it will hold (see Bolt)
SCU = Starter Control Unit
Scuttle = Trim panel or finishing panel (see Cowl, Knee bolster, Underscuttle)
SDC = Soft Door Close
SDD = Ford/JLR System-Driven Diagnostics, computer-based diag. system (see IDS, PDU, WDS)
SE = Special Equipment version of XK120 (M in the U.S.)
Seat Back = Squab, the upright portion of the seat
Security Torx = Torx screw with a cylinder centered in the internal lobes requiring a special bit
Sedan = A full-size passenger car, a Saloon
SEFI = Sequential Electronic Fuel Injection (SFI)
SEL = Service Engine Lamp (CEL, EML, MIL, SES)
Sender = A transducer whose electrical or electronic signal varies with fuel level, oil pressure, temperature, rotary speed, etc.
Sensor Ring = Reluctor, sensor rotor, trigger wheel
Sensor Rotor = Reluctor, sensor ring, trigger wheel
Servo = Servomechanism, augments the force of other mechanisms, such as a brake or clutch servo
Servotronic, Servotronic 2 = ZF-Bosch Speed-sensitive variable ratio electronic steering rack system
SES = Service Engine Soon lamp (CEL, EML, MIL, SEL)
Set screw = Allen screw, Grub screw
SFI = Sequential Fuel Injection (SEFI), Stratified Fuel Injection System
Shakeproof Washer = Toothed Lock Washer (Internal or External Teeth), Star Washer (External Teeth)
Shim = Thin metal spacer, made in precise thicknesses for adjusting the free play of moving parts
Shock = Shock Absorber, Damper
Shock Absorber = Damper
Shooting-brake = Estate Car, Station Wagon
Shop, Repair Shop = Garage
Short-Circuit Rating = Current at which a fuse melts; Imax, Breaking Capacity, Interrupting Rating
Shoulder (of road) = Verge (of road)
SHRTFT = Short Term Fuel Trim (FTST, STFT)
SI = Le Système International d'Unités, International System of Units (ISU)
Side Curtains = Removable side windows
Sideshaft = Half-shaft, Half-axle, connects differential, transaxle or transfer case/box to wheel
Signals = Turn Signals, Indicators, Direction Indicators (DI)
Silencer = Muffler
Sill = Rocker Panel
Sill Plate = Tread Plate, sill finisher
SIM = Subscriber Identity Module, telephone SIM card
Sir William Lyons = Known as “Mr. Jaguar,” co-founded Jaguar Cars with William Walmsley
SIS = Side Impact Sensor
Slip Road = On/Entrance Ramp or Off/Exit Ramp, a short road for joining or leaving a freeway
SLM = Security Locking Module; Security and Locking Control Module (SLCM)
SLS = Self-Leveling Suspension
Smog = Contraction of Smoke and Fog; air pollution, often consisting of smoke, fog and chemical fumes
SMOG Sensor = Automatically closes HVAC recirculation flap when CO, HC or NOx fumes detected
SMS = Short Message Service, telephone text messaging
SOHC = Single Overhead Camshaft (see OHC)
Solenoid = Mechanism that converts electricity, hydraulic or pneumatic pressure into physical motion
SORN = Statutory Off Road Notice, filed to avoid paying vehicle tax while a car is out of use (U.K.)
Sovereign = Jaguar saloon with upgraded trim compared to Base model
**** Nuts = Panel-mounted threaded fasteners made by RB&W (w.s.)
Spanner = Wrench
Spark Plug Cables or Wires = High Tension Leads
Spats = Fender Skirts
Speed Control = Cruise Control
Speed Nut = Spire Nut, Clip-on Nut
Speedo = Speedometer, Speed Meter, Velocimeter, Velocity Meter
Spire Nut = Speed Nut, Clip-on Nut
SPL = Sound Pressure Level
Split Pin = Cotter Pin
SportBrake = Proposed Jaguar sporty shooting brake/station wagon based on current XJ
Spring Washer = Lock Washer, Helical Spring Lock Washer
Sprocket = Timing chain gear
SPS = Seat Position Sensor
Squab = Seat Back, the upright portion of the seat
SRS = Supplementary Restraint System
SS Cars Ltd. = Standard Swallow Car company, renamed Jaguar Cars Ltd. in 1945
SS90 = SS Cars Ltd. “SS Jaguar” sports car produced in 1935, predecessor to the SS100
SS100 = SS Cars Ltd. “SS Jaguar” sports car produced 1936-40, successor to the SS90
SSP = Switched System Power
STAI = Short Term Adaptive Idle (see also LTAI)
Stabilizer Bar = Anti-sway Bar, Anti-roll Bar, Sway Bar, Torsion Bar
Star = Torx fastener, trademarked screw head design with 6 internal or external lobes or points; 6lobe
Star Washer = External Toothed Lock Washer, Shakeproof Washer
Starter Gear = Ring Gear on flywheel or flex plate
Station Wagon = Estate Car, Shooting-brake
Steering Knuckle = Vertical Link, suspension component that locates front stub axle
STI = Short Term Idle adaptation (see LTI)
Stick = A manual transmission or a vehicle with a manually-shifted transmission
STFT = Short Term Fuel Trim (FTST, SHRTFT)
Stoic = Stoichiometric AFR (Lambda)
Stoichiometric AFR = Ideal fuel mixture with just enough oxygen to burn all the fuel (Lambda, Stoic)
STP = Standard Temperature and Pressure, (0 deg. C/32 deg. F at 1 atm/14.7 psi/1.01325 bar)
Straight Six = Inline six-cylinder engine (I6)
STR = Stored Throttle Position (see alternate meaning)
STR or ST-R = S-type R, the supercharged S-type
STS = Seatbelt Tension Sensor, Service Technicians Society
Stub Axle = Short axle for non-powered wheel, such as the front wheels of a RWD vehicle
Stubby Screwdriver = Dumpy Screwdriver, short screwdriver
Stud = Wheel stud; or a fastener with two threaded ends, one screwed in place, one used with a nut.
S-Type (Classic) = Jaguar saloon produced 1963-68
S-Type (Modern) = (X200-206) 1999-2008 Saloon on Ford DEW98 platform (Lincoln LS/Ford Thunderbird)
Subframe = Crossmember
Sump = Oil Pan
Sundym = Non-exclusive trademark of Triplex Safety Glass Co. Ltd., now used by Pilkington
Sunroof = A movable roof panel that opens to the air; often also used in reference to a Moonroof (w.s.)
Swallow Sidecar Company = Founded in 1922, became SS Cars Ltd. in 1934, Jaguar Cars Ltd. in 1945
Swapover Valve = On vehicles with two fuel tanks, this valve selects which tank supplies the engine
SWAS = Steering Wheel Angle Sensor
Sway Bar = Anti-sway bar, anti-roll bar, torsion bar
SWB = Short Wheel Base (see LWB, WB)
Swing Link = Double U-joint that permits a more acute steering column bend angle
T = Time in seconds
TA = Traffic Announcements
Tab Washer = Flat washer with projecting tab that is bent upward to lock against the nut or bolt head
Tach or TACH = Tachometer, Rev Counter, revolution counter
Tachometer = Rev Counter, revolution counter, Tach or TACH
Tappet = A sliding rod or capped cylinder intermittently struck by a camshaft lobe to open a valve.
Tata Motors = Mumbai, India-based corporate owner of JLR since 2008
Tata, Ratan = Former Chairman of Tata Motors who oversaw the acquisition of JLR from Ford Tattered = In poor condition
TAU = Theft Alarm Unit
TAVDICT = Torque Actuated Variable Dual Independent Camshaft Timing (See VCT, VVT)
TB = Throttle Body
TC = Torque Converter; Turbocharger/Turbocharged engine; Top Center (TDC); Traction Control
TCC = Torque Converter Clutch
TCM = Transmission Control Module
TCMISO = Transmission Control Module ISO bus
TCS = Traction Control System
TDC = Top Dead Center, Top Center (TC)
Teflon = DuPont trademark for polytetrafluroethylene (PTFE) class of thermoplastics
TFT = Thin-Film Transistor, Transmission Fluid Temperature Sensor
TFT LCD = Thin-Film Transistor Liquid Crystal Display
TFTS = Transmission Fluid Temperature Sensor
Thermistor = Temperature-sensitive resistor
Throwout Bearing = Thrust Bearing
Thrust Bearing = Throwout Bearing
Tick Over = Idle, or the engine speed at tick over
Tie Rod = Track rod, connecting rod (steering)
Tie Rod End = Track rod end (steering)
Tire = Tyre
TFT = Transmission Fluid Temperature Sensor
TM = Throttle Motor
Toll Motorway = Turnpike
Tonneau = Tonneau Cover A waterproof cover fastened over the cockpit of a roadster or convertible
Toothed Lock Washer = Internal or External Teeth, Shakeproof Washer, Star Washer (External Teeth)
TOPix = JLR Technical and Owner Publications Information Exchange (formerly GTR)
Top Dead Center = Position of piston when it is at its farthest distance from the crankshaft (see BDC)
Torch = Flashlight
Torque = Rotational force, measured in pound-feet (lb-ft) or Newton-meters (Nm)
Torque & Torque Pro = Android OBDII app that pairs with a Bluetooth device such as an ELM327
Torque Converter = Fluid coupling that replaces a mechanical clutch in an automatic transmission.
Torsion Bar = Anti-sway bar, anti-roll bar, stabilizer bar, sway bar
Torx = “Star” fastener, trademarked screw head design with 6 internal or external lobes or points; 6lobe
Torx Plus = Improved head profile Torx fastener
Torx, Security = Torx screw with a pin centered in the internal lobe socket requiring a special bit
TOT = Transmission Oil Temperature
TP = Throttle Position, Throttle Position Sensor (TPS), Throttle Potentiometer (TPP)
TP = radio Traffic Program
TP1 = Throttle Position Sensor Resistive Element 1
TP2 = Throttle Position Sensor Resistive Element 2
TPM = Tire Pressure Monitoring System
TPMS = Tire Pressure Monitoring System or Sensor
TPP = Throttle Potentiomenter, Throttle Position Sensor (TPS)
TPS = Throttle Position Sensor (potentiometer) (TP), Throttle Position Switch (On/Off only)
TQ = Torque (TRQ)
Track Rod = Tie rod, connecting rod (steering)
Track Rod End = Tie rod end, Connecting rod end (steering)
Trannie = Transmission, Trans, Gearbox, Box
Tranny = Transmission (Gearbox)
Trans = Transmission, Trannie, Gearbox, Box
Transaxle = Combination transmission & axle drive for front-wheel and all-wheel drive systems
Transducer = Converts one form of energy to another, e.g. pressure to electricity; electricity to sound
Transfer Box = Transfer Case, additional gear set for AWD and 4WD vehicles
Transfer Case = Transfer Box, additional gear set for AWD and 4WD vehicles
Transmission = Gearbox, Trans, Trannie, Box
Transponder = Passive security device in the key or fob of a PATS-equipped vehicle
Tread Plate = Sill plate, sill finisher
Trigger Wheel = Reluctor, sensor ring, sensor rotor
TRQ = Torque (TQ)
TS = Throttle Switch
Trunnion = Cylindrical device fitted to a throttle cable, choke cable, etc. to serve as a stop
Truck = Lorry
Trumpet = Bell- or horn-shaped section of a carburetor or throttle body inlet, warning horn output, etc.
TS = Twin Screw (a type of supercharger)
TSB = Technical Service Bulletin, updated information from Jaguar to Dealers & Technicians (JTB)
Tuffelt = Thick underfelt fabric used for sound-deadening and padding in Jaguar interiors
TURN = Turn Signal
Turn Signals = Indicators, Direction Indicators, Signals (DI)
Turnpike = Toll Motorway
TV = Television
TVbB or TVBB = Torque Vectoring by Braking
Twin Cam = Dual- or Double-Cam engine, typically a DOHC engine
Twin OHC = Dual- or Double-Cam engine, typically a DOHC engine
TWR = Tom Walkinshaw Racing, partner in JaguarSport and TWR special edition models (see TRW)
Tyre = Tire
U = Potential Energy (see Ue)
Ue = Electric Potential Energy (see U)
UEGO = Upstream Exhaust Gas Oxygen sensor (UHEGO, HO2, HO2S, Lambda Sensor, O2S)
UHEGO = Upstream Heated Exhaust Gas Oxygen sensor (HEGO, HO2, HO2S, O2S, UEGO)
UHP = Ultra-High Performance, a manufacturer’s classification for tires/tyres
U-joint = Universal joint (UJ)
UJ = Universal Joint (U-joint)
Underfelt = Thick natural jute with rubber coating used as Jaguar carpet padding and soundproofing
Underscuttle = Knee bolster, trim panel, finishing panel, etc.
UNF = Unified National Fine Thread (see UTS)
Unibody = Monocoque
Unmetered = Not measured by the EMS
Unmetered Air = Air drawn into Intake Manifold but not measured by the MAFS (e.g. vacuum leak)
Unmetered Fuel = Fuel drawn into Intake Manifold but not measured by the ECM (e.g. leaking FPR)
Upstream = Earlier/preceding in a circuit/system, as in Upstream O2S (Pre Cat) (see Downstream)
U.T. = United Technologies (w.s.)
UTS = Unified Thread Standard, ASME/ANSI standard for threads used in the U.S.A. & Canada
UV = Ultraviolet, EMR with wavelengths shorter than visible light, longer than X-rays (see EMR, IR)
V = Volt, Volts
V6 = Six-cylinder engine with two banks of three cylinders arranged in a vee orientation
V8 = Eight-cylinder engine with two banks of four cylinders arranged in a vee orientation
V12 = Twelve-cylinder engine with two banks of six cylinders arranged in a vee orientation
V12, Jaguar = Engine designed by Jaguar engineers Wally Hassan, Claude Baily and Harry Mundy
VAC = Volts Alternating Current (see VDC), or Vacuum
VACM = Voice Activated Control Module (VAM), see JaguarVoice
Valance = A long narrow horizontal trim panel or finisher
Valet Key = Key that will operate ignition switch but not glove box or trunk locks
Valey Mode = Mode in which glove box and trunk opening are inhibited
Valve Cover = Protective cap on overhead-valve (OHV) engine, rocker cover, see Cam Cover
VAM = Voice Activation Module (VACM), see JaguarVoice
Vanden Plas = Name of early luxury coachbuilder used in place of Daimler for U.S. market
Vapor Lock = Non-start due to fuel changing from liquid to gas while still in the fuel delivery system
VAPS = Variable Assist Power Steering (see ZF-Bosch Servotronic, PAS, PASCM)
VASA = Variable Assist Steering Actuator (Transducer/Solenoid Valve)
VAST = Variable Assist Steering Transducer (Actuator/Solenoid Valve)
VAT = Vane Air Temperature Sensor (ACT, CTS, IAT, IATS, MAT, MCT)
Vaumol = Trademarked natural-grain grade of Connolly Leather (see Autolux, Autocalf)
Vbat = Battery Positive Voltage, B+
VBR = Definition not yet known; from p. 208 of X350 Owner’s Manual, appears diesel-related
VCATS = Vehicle Configuration And Test System
VCM = Ford/JLR Vehicle Communication Module OBDII serial comm. gateway for IDS, WDS, SDD
VCM II = Second generation Ford/JLR Vehicle Communication Module
VCT = Variable Camshaft Timing (see VVT, TAVDICT)
VCTOCS = Variable Camshaft Timing Oil Control Solenoid
VCV = Volume Control Valve, Diesel Fuel Volume Control Valve
VDC = Volts Direct Current (see VAC)
VEMS = Vehicle Emergency Messaging System (JagNet)
Veneer = Thin sheet material, often figured wood, used a finish surface over a less-expensive substrate
Vent Window = Quarterlight, quarter window
Verge (of road) = Shoulder (of road)
Vertical Link = Steering Knuckle
VFD = Vacuum Fluorescent Display used on early XJ40 instrument panels
Vibration Damper = Crankshaft Damper, Crank Pulley Damper, Harmonic Balancer or Damper
VIC = Virtual Instrument Cluster, Virtual Instruments (dev. for Jaguar by VST and QNX) (DIC, VI)
VICS = Vehicle Information Control System (Japan)
VIN = Vehicle Identification Number, unique factory-applied automobile identifier code
Vinyl = Upholstery fabric with surface made of vinyl polymers (see Rexine, Vynide, Ambla)
VIS = Variable Intake System (see IMT)
vis-à-vis = Face-to-face, facing, opposite, in relation to, compared to
Viscosity = The extent to which a liquid resists the tendency to flow
Viscosity Index = Scale indicating the variation of an oil’s viscosity with variation in temperature
Viscous Coupling = Hydromechanical device that transfers torque & rotation by way of a viscous fluid
Vise Grips Pliers = Mole Grips Pliers
Vitreous Enamel = Porcelain Enamel: fused powdered-glass coating on some Jaguar exhaust manifolds
Volt = Unit of electric potential, electric potential difference (Voltage), & Electromotive Force
Voltage = Electric potential difference or Electromotive Force, measured in Volts, see Current
Voltage Regulator = Voltage Stabilizer
Voltage Stabilizer = Voltage Regulator
VOM = Volt-Ohm Meter, still useful but in general supplanted by the more modern DMM
VPW = Variable Pulse Width Modulation, a GM OBD protocol
VR = Voltage Regulator
VRLA = Valve-Regulated Lead Acid battery (sealed or maintenance-free battery)
VRS = Vehicle Road Speed, typically expressed in mph o km/h (RS, VS)
VS = Vehicle Speed, typically expressed in mph o km/h (RS, VRS)
VSS = Vehicle Speed Sensor
VSO = Vehicle Speed Output
VVA = Vehicle Vibration Analyzer
VVT = Variable Valve Timing (see VCT)
VVT = Variable Valve Timing Solenoid Valve; VVT1 = Bank 1/ RH Bank; VVT2 = Bank 2/ LH Bank
Vynide = Early form of vinyl introduced on the XK150, thicker than Rexine but no knit backing
Wabco ECAS = Electronically Controlled Air Suspension, basis of Jaguar CATS and ECATS
WAG = Wild-assed guess
Washed Cylinder = Cylinder in which excess fuel has washed away oil causing loss of compression
Washer = Windshield/Windscreen washer
Washer = A ring of steel or other material used with a bolt and nut to distribute pressure, seal, etc.
Washer, D = D-Washer Round washer with a flat-sided center hole that resembles the letter D
Washer, Tab = Flat washer with projecting tab that is bent upward to lock against the nut or bolt head
Water Pump Pliers = Channellock Pliers, slip-joint pliers, tongue-and-groove pliers
Waxoyl = Rustproofing liquid used on many Jaguars to protect against body and chassis corrosion
WB = Wideband or Wide Band, a type of O2 Sensor
WB or W/B = Wheel Base or Wheelbase (see LWB, SWB)
WDS = Ford/JLR Worldwide Diagnostic System, computer-based diagnostics (see IDS, PDU, SDD)
Weather Seal = Weatherstrip, Draught Excluder
Weatherstrip = Weather Seal, Draught Excluder
Weight = Force exerted on a body by gravity, varies with altitude but commonly equated to Mass (w.s)
Weslake, Harry = Cylinder-head and engine tuning specialist who helped refine the Jaguar XK engine
Weslake Research and Development = Firm of cylinder-head specialist Harry Weslake (XK engine)
Wheel Nut = Lug Nut
Whitley = Coventry, U.K. headquarters of Jaguar Land Rover from 2011
Whitworth, British Standard Imperial unit-based thread measurement standard
WHP = Wheel horsepower
Wilton Cloth = Angora goat fleece textile used in classic Jaguar convertible tops & tonneaus (Mohair)
Windscreen = Windshield
Windshield = Windscreen
Wing = Fender
Wiring Harness = Loom, Harness Loom
Woodruff Key = Half-moon shaped tab that aligns and connects a gear or pulley to a drive shaft
Woolcloth = Woolen textile used in Jaguar headliners until c. 1971
Worm-Drive Hose Clamp = Jubilee Clip; hose clamps made by Cheney, Jubilee, Norma, Regent, TEX
WOT = Wide Open Throttle
WOT During Cranking = ECM senses WOT and cancels fuel injection to clear flooded engine
WPR = Weight-to-Power Ratio, pounds-per-horsepower, see PWR
Wrench = Spanner
Wrist Pin = Gudgeon Pin, piston-to-connecting rod pin
w.s. = Which See, see the separate entry in this list
WSS = Wheel Speed Sensor (ABS Sensor)
WTF = “What the F**k”
WV = Water Valve (DCCV, DCFV, CCV, HCV, HWCV, HV)
X-Type = Jaguar compact saloon range produced 2001-2009 (X400) based on Ford CD132 platform
X100 = Jaguar project code for XK8/XKR GTs produced 1995-2005 (replaced the XJS)
X150 = Jaguar project code for 2nd gen. XK8/XKR produced 2005-2014 (facelifted 2011)
X200 = Jaguar project code for S-Type (Modern) produced 1999-2002
X202 = Jaguar project code for S-Type (Modern) produced 2002-04
X204 = Jaguar project code for S-Type (Modern) produced 2004-06
X206 = Jaguar project code for S-Type (Modern) produced 2006-08
X250 = Jaguar project code for XF & XFR from 2008 (replaced S-Type)
X300 = Jaguar project code for XJ6/XJR saloon range produced 1995-1997 (replaced the XJ40)
X305 = XJ12 12-cylinder version of the X300 saloon
X306 = XJR6 S/C version of the X300 saloon
X308 = Jaguar project code for XJ8/XJR saloon range produced 1998-2003 (replaced the X300)
X330 = LWB version of the X308
X350 = Jaguar project code for aluminum bodied XJ8/XJR range produced 2004-?????
X350 XJ6 = Reintroduction of a 6-cylinder saloon with a 3.0L V6 engine
X351 = Jaguar project code for current XJ range from 2009 (replaced the X358)
X358 = Facelifted version of the X350 produced from 2007-2009
X400 = Jaguar project code for the X-Type compact saloon range produced 2001-2009
X760 = Jaguar project code for XE compact saloon range produced from 2015
X761 = Jaguar project code for F-Pace Crossover Utility Vehicle (based on C-X17 concept ) from 2016
XK120 = Jaguar sports car produced from 1948-54, heir to the SS100 which ceased production in 1940
XK120-C = Better known as the C-Type, racing car produced 1951-53, Le Mans winner 1951 & 1953
XK140 = Jaguar sports car produced 1954-57, successor to the XK120
XK150 = Jaguar sports car produced 1957-61, replaced by the E-Type
XK8 / XKR = Jaguar GT produced 1995-2005 (X100), and 2005-14 (X150)
XK-E or XKE = U.S. designation for the E-Type, Jaguar range of sports cars produced from 1961 to 1975
XKSS = 1957 road-legal sports car produced from complete and unfinished D-Type racing cars
XJ12 = 12-cylinder version of XJ saloon (XJ12, XJ81, X305)
XJ12C = 12-cylinder 2-door coupe version of the Series II XJ saloon produced 1975-77
XJ220 = 2-seat Jaguar supercar produced 1992-94, fastest production car in the world when released
XJ40 = Jaguar project code for XJ6/XJR saloon range produced from 1987-1994
XJ6 = Jaguar saloon range 1968-73 (Series I or 1); 1974-79 (Series II or 2); 1979-92 (Series III or 3)
XJ6C = 2-door coupe version of the Series II XJ saloon
XJ81 = Jaguar project code for 12-cylinder version of XJ40 saloon; Daimler Double Six (U.K.); XJ12 (U.S.)
XJ-S / XJS = Jaguar GT produced 1975-96 (replaced the E-Type)
X-Type = Jaguar compact saloon range produced 2001-2009 (X400) based on Ford CD132 platform
Yard = Unit of length, 1 yard = 3 feet = 0.9144 Meter
YCCC = Yellow Chromate Conversion Coating, coating applied over cadmium to prevent white oxidation
YMMV = “Your mileage may vary” (“Your experience may differ from mine”)

Zenith = Jaguar project code for the Mark X saloon