Car Abbreviations

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A - Amperes
A/C - Air Conditioning
A/CL BIMET - Air Cleaner Bi-Metal Sensor
A/CL DV - Air Cleaner Duct and Valve Vacuum Motor
A/D - Analogue to Digital Converter
A/F - Air Fuel Ratio
A/T - Automatic Transmission
A4R70W - Automatic Overdrive Electronic Wide Ration Transmission
AAC - Auxiliary Air Control Valve
AAV - Anti-Afterburn Valve (Mazda)
ABCV - Airbleed Control Valve (Ford)
ABS - Antilock Brake System
ABSV - Air Bypass Solenoid Valve (Mazda)
ABV - Air Bypass Valve
AC - Alternating Current
ACC - Air Conditioning Clutch
ACC - Automatic Climate Control
ACCS - A/C Cycling Clutch Switch
ACD - Air Conditioning Demand Switch
ACON - Air Conditioning On Signal
ACP - Air Conditioning Pressure Signal
ACPSW - Air Conditioning Pressure Switch
ACR - Air Conditioning Relay
ACR4 - Air Conditioning Refrigerant, Recovery, Recycling, Recharging
ACT - Air Charge Temperature
ACV - Air Control Valve
ADU - Analog-Digital Unit
AFC - Air Flow Control
AFM - Air Flow Meter
AFR - Air Fuel Ratio
AFS - Air Flow Sensor (Mitsubishi)
AIR - Secondary Air Injection System
AIRB - Air Bypass Solenoid
AIRD - AIR Diverter Solenoid
AIS - Air Injection System (Chrysler)
AIS - Automatic Idle Speed
AIV - Air Injection Valve
ALC - Automatic Level Control
ALCL - Assembly Line Communications Link (GM)
ALDL - Assembly Line Data Link
ALT - Alternator (replaced with GEN)
AM1 - Air Management 1, AIR Bypass
AM2 - Air Management 2, AIR Diverter
AMB - Ambient
AOD - Automatic Overdrive
AODE - Automatic Overdrive Electronic Transmission
AODE-W - Automatic Overdrive Electronic Wide (ratio transmission)
AP - Accelerator Pedal
APC - Automatic Performance Control
APS - Atmospheric Pressure Sensor (Mazda)
APS - Absolute Pressure Sensor (GM)
APT - Adjustable part Throttle
ARC - Automatic Ride Control
ARS - Automatic Restraint System
ASARC - Air Suspension Automatic Ride Control
ASD - Automatic Shutdown Relay
ASDM - Airbag System Diagnostic Module (Chrysler)
ASE - Automotive Service Excellence
ASM - Acceleration Simulation Mode
ASR - Acceleration Slip Regulation
ATC - Automatic Temperature Control
ATDC - After Top Dead Centre
ATF - Automatic Transmission Fluid
ATM - Actuator Test Mode
ATS - Air Temperature Sensor (Chrysler)
ATX - Automatic Transaxle
AVOM - Analog Volt / Ohm Meter
AWD - All-Wheel Drive
AWD - All Wheel Drive
AWG - American Wire Gage'
AX4S - Automatic 4-Speed Trans.
AXOD - Automatic Overdrive Transaxle
AXOD-E - Automatic Overdrive Transaxle - Electronically Controlled
B/MAP - Barometric/Manifold Absolute Pressure
B+ - Battery Positive Voltage
BAC - Bypass Air Control Valve
BARO - Barometric Pressure
BAT - Battery
BC - Blower Control
BCM - Body Control Module
BHP - Brake Horsepower
BHS - Bimetal Heat Sensor (Ford)
BID - Breaker less Inductive Discharge (AMC)
BLM - Block Learn Multiplier (replaced with LT FUEL TRIM)
BMAP - Barometric/Manifold Absolute Pressure Sensor (Ford)
BOB - Breakout Box
BOO - Brake On / Off Switch
BP - Barometric Pressure
BPA - Mechanical Bypass Air
BPCSV - Bypass Control Solenoid Valve
BPP - Brake Pedal Position Switch
BPS - Back Pressure Sensor
BPT - Back-Pressure Transducer
BPV - Bypass Valve (Ford)
BPW - Brake Pulse Width
BSV - Backfire Suppressor (Ford)
BTDC - Before Top Dead Center
BTS - Battery Temperature Sensor
BTSI - Brake Transmission Shift Interlock
Btu - British Thermal Unit
BUS N - Bus Negative
BUS P - Bus Positive
BV - Bowl Vent Port (Ford)
BVSV - Bi-Metal Vent Control Valve
BVT - Backpressure Variable Transducer System (Ford)
C - Carbon
C - Celsius
C.A.R.B. - California Air Resource Board
C3 - Computer Command Control System (GM)
C3I - Computer Controlled Coil Ignition
C4 - Computer Controlled Catalytic Converter System (GM)
CAC - Charge Air Cooler
CANP - EVAP Canister Purge Solenoid
CARB - Carburettor
CAS - Clean Air System
CAS - Crank Angle Sensor
CASE - Cranking Angle Sensing Error
CBD - Closed Bowl Distributor
CC - Catalytic Converter
CC - Cruise Control
CC - Cubic Centimetres
CC - Climate Control
CCC - Converter Clutch Control
CCC - Computer Command Control System (GM)
CCD - Computer Controlled Dwell
CCD - Chrysler Collision Detection
CCDIC - Climate Control Driver Information Centre
CCEI - Coolant Controlled Idle Enrichment (Chrysler)
CCEV - Coolant Controlled Engine Vacuum Switch (Chrysler)
CCM - Central Control Module
CCM - Continuous Component Monitor
CCNT, DTC CCNT - Count Code 
CCO - Converter Clutch Override
CCOT - Cycling Clutch Orifice Tube
CCP - Climate Control Panel
CCP - Controlled Canister Purge (GM)
CCRM - Constant Control Relay Module
CCS - Coast Clutch Solenoid
CCSP - Carbon Canister Storage/Purge
CCV - Canister Control Valve
CDCV - Canister Drain Cut Valve
CDI - Capacitor Discharge Ignition (AMC)
CDR - Chrysler Diagnostic Readout
CDRV - Crankcase Depression Regulator Valve
CE - Commutate End
CEAB - Cold Engine Air Bleed
CEC - Crankcase Emission Control System (Honda)
CECU - Central Electronic Control Unit (Nissan)
CEL - Check Engine Light
CER - Cold Enrichment Rod (Ford)
CES - Clutch Engage Switch
CESS - Cold Engine Sensor Switch
CFC - Chlorofluorocarbons
CFI - Central Fuel Injection
CFI - Continuous Fuel Injection
CFM - Cubic Feet Per Minute
CFV - Critical Flow Venturi
CHM - Cold Mixture Heater
CID - Cylinder Identification Signal
CID - Cubic Inch Displacement
CIS - Continuous Injection System (Bosch)
CKP - Crankshaft Position Sensor
CKP REF - Crankshaft Position Reference
CKT - Circuit
CL - Closed Loop
CLC - Converter Lockup Clutch (replaced with TCC)
CLCC - Closed Loop Carburetor Control
CLNT - Coolant
CLV - Calculated Load Value
CMFI - Central Multi-port Fuel Injection
CMP - Camshaft Position Sensor
CMP REF - Camshaft Position Reference
CO - Carbon Monoxide
CO2 - Carbon Dioxide
COC - Conventional Oxidation Catalyst (Ford)
COP - Coil On Plug Electronic Ignition
CP - Canister Purge (GM)
CP - Crankshaft Position Sensor (Ford)
CPA - Connector Position Assurance 
CPI - Central Port Fuel Injection
CPP - Clutch Pedal Position
CPS - Central Power Supply
CPSOV - Canister Purge Shut Off Valve (Ford)
CPU - Central Processing Unit
CRK - Cranking Signal
CRT - Cathode Ray Tube
CSC - Coolant Spark Control (Ford)
CSE GND - PCM Case Ground
CSSA - Cold Start Spark Advance System (Ford)
CSSH - Cold Start Spark Hold System (Ford)
CTAV - Cold Temperature Actuated Vacuum Switch (Ford)
CTM - Central Timer Module
CTO - Clean Tachometer Output
CTO - Coolant Temperature Override
CTOX - Continuous Trap Oxidizer
CTP - Closed Throttle Position
CTS - Charge Temperature Switch (Chrysler)
CTS - Coolant Temperature Sensor
CTVS - Closed Throttle Vacuum Switch
CV - Constant Velocity
CV - Control Valve
CVCC - Compound Vortex Controlled Combustion System (Honda)
CVR - Control Vacuum Regulator (Ford)
CVS - Constant Volume Sampler
CWM-Ford - Cold Weather Modulator (Ford)
DAB - Delayed Accessory Bus
dB - Decibels
DC - Duty Cycle
DC - Direct Current
DCISCA - DC Motor Idle Speed Actuator
DCL - Data Communication Link
DDL - Diagnostic Data Link
DE - Drive End
DEC - Digital Electronic Controller
DEFI - Digital Electronic Fuel Injection (Cadillac)
DEPS - Digital Engine Position Sensor
DERM - Diagnostic Energy Reserve Module
DFCO - Decel Fuel Cutoff Mode
DFI - Direct Fuel Injection
DFS - Decel Fuel Shutoff
DI - Direct Ignition
DI - Distributor Ignition (System)
DIC - Driver Information Center
DICM - Distributor Ignition Control Module
DIS - Direct Ignition (Waste Spark)
DLC - Data Link Connector (OBD)
DM - Drive Motor
DMCM - Drive Motor Control Module
DMCT - Drive Motor Coolant Temperature
DMPI Module - Drive Motor Power Inverter Module
DMS - Distributor Modulator System
DOHC - Dual Overhead Cam
DOL - Data Output Line to IPC
DPC - Dynamic Pressure Control
DPFE - Differential Pressure Feedback
DPI - Fuel Plug Inhibit
DRB II - Diagnostic Readout Box (Chrysler)
DRCV - Distributor Retard Control Valve
DRL - Daytime Running Lights
DSO - Digital Storage Oscilloscope
DSR - Ford Diagnostic Subroutine
DSS - Downshift Solenoid
DSSA - Dual Signal Spark Advance (Ford)
DSV - Deceleration Solenoid Valve
DTC - Diagnostic Trouble Code
DTC FRZ - Diagnostic Trouble Code Freeze Frame
DTM - Diagnostic Test Mode
DTVS - Dual Temperature Vacuum Switch
DV - Delay Valve
DVAC - Distributor Vacuum Advance Control Valve
DVDSV - Differential Vacuum Delay and Separator Valve
DVDV - Distributor Vacuum Delay Valve
DVOM - Digital Volt-Ohmmeter
DV-TW - Relay Valve Two Way
DVVV - Distributor Vacuum Vent Valve
E4OD - Electronic 4-Speed Overdrive
EAC - Electronic Air Control (replaced with AIR)
EACV - Electronic Air Control Valve
EAIR - Electronic Secondary Air Injection
EBCM - Electronic Brake Control Module
EBP - Exhaust Back :Pressure 
EBTCM - Electronic Brake T/C Module
EC - Engine Control
ECA - Electronic Control Assembly (Ford)
ECC - Electronic Climate Control
ECCS - Electronic Concentrated Control System
ECI - Extended Compressor at Idle
ECIT - Electronic Control Ignition Timing
ECL - Engine Coolant Level
ECM - Engine/Electronic Control Module
ECS - Evaporation Control System (Chrysler)
ECS - Emission Control System
ECT - Engine Coolant Temperature
ECU - Electronic Control Unit
EDF - Electro-Drive Fan
EDIS - Electronic Direct Ignition System (replaced with EI)
EDM - Electronic Distributor Modulator (Ford)
EEC - Electronic Engine Control (Ford)
EEC-I - Control of Ignition Timing
EEC-II - Control of Ignition Timing and Fuel Delivery Through a Feed Carburetor System
EEC-III - Control of Ignition Timing and Fuel Delivery Through a Central Fuel Injection System
EEC-IV - Control of Ignition Timing and Fuel Delivery Through an Electronic Fuel Injection System
EECS - Evaporative Emission Control System
EEGR - Electronic EGR (Solenoid)
EEGR Monitor - Electronic EGR Test
EEPROM - Electronically Erasable Programmable Read Only Memory
EESS - Evaporative Emission Shed System (Ford)
EEVIR - Evaporator Equalized Values in Receiver
EFC - Electronic Fuel Control
EFC - Electronic Feedback Carburetor (Chrysler)
EFCA - Electronic Fuel Control Assembly (Ford)
EFE - Early Fuel Evaporation
EFI - Electronic Fuel Injection
EFT - Engine Fuel Temperature
EFV - Early Fuel Evaporation
EGC - Exhaust Gas Check Valve (Ford)
EGO - Exhaust Gas Oxygen Sensor (Ford)
EGOR - EGO Signal Return (Ford)
EGR - Exhaust Gas Recirculation 
EGR Monitor - OBDII EGR Test 
EGR TVV - Exhaust Gas Recirculation Thermal Vacuum Valve
EGRB - EGR Boost Sensor
EGRC - EGR Control Solenoid (Ford)
EGRC-BPT - EGR Control Back Pressure Transducer
EGRPS - EGR Valve Position Sensor (Mazda)
EGRT - Exhaust Gas Recirculation Temperature
EGRV - Exhaust Gas Recirculation Vent Solenoid
EGTS - Exhaust Gas Temperature Switch (replaced with EGRT)
EH - Electro-Hydraulic
EI - Integrated Electronic Ignition System
EICV - Electronic Idle Control Valve
ELB - Electronic Lean Burn (Chrysler)
ELC - Electronic Level Control
ELCD - Evaporative Loss Control Device
EM - Engine Modification
EMB - Electromagnetic Brakes
EMF - Electromotive Force (voltage)
EMI - Electromagnetic Interference
EMR - Electronic Module Retard
EN - Generator (Alternator)
EOBD - European On Board Diagnostics
EOP - Engine Oil Pressure
EOS - Exhaust Oxygen Sensor
EOT - Engine Oil Temperature
EP - Exhaust Pressure
EPA - Environmental Protection Agency
EPC - Electronic Pressure Control
EPOS - EGR Valve Position Sensor (Ford)
EPROM - Erasable Programmable Read Only Memory
EPT - EGR Pressure Transducer (replaced with PFE)
ESA - Electronic Spark Advance (Chrysler)
ESC - Electronic Spark Control System (Ford)
ESD - Electrostatic Discharge
ESS - Electronic Spark Selection (Cadillac)
EST - Electronic Spark Timing
ETC - Electronic Temperature Control
ETP - EGR Pressure Transducer
ETR - Electronically Tuned Receiver
EVAP - Evaporative Emissions System
EVAP CP - Evaporative Canister Purge
EVAP CV - Evaporative Emissions System Canister Vent
EVIC - Electronic Vehicle Information Center
EVO - Electronic Vehicle Orifice
EVP - EGR Valve Position Sensor
EVR - EGR Vacuum Regulator
EXH - Exhaust
F4WD - Full Time Four Wheel Drive
FAN - Cooling Fan (Low or High Speed)
FBC - Feedback Carburettor
FBCA - Feedback Carburettor Actuator (Ford)
FC - Fan Control
FCA - Fuel Control Assembly (Chrysler)
FCS - Fuel Control Solenoid (Ford)
FDBK - Feedback
FDC - Fuel Deceleration Valve (Ford)
FDV - Fuel Decal Valve (Ford)
FEEPROM - Flash Electronically Erasable Programmable Read Only Memory
FEPROM - Flash Erasable Programmable Read Only Memory
FF - Flexible Fuel
FI - Fuel Injector
FIC - Fast Idle Control
FICD - Fast Idle Control Device
FIPL - Fuel Injection Pump Lever
FLC - Fluid Lock-up Converter (Ford)
FLS - Fluid Level Sensor (GM)
FM - Fan Motor Program in PCM
FMEM - Failure Mode Effect Management
FMVSS - Federal Motor Vehicle Safety Standards
FOM - Fix Operating Mode (Limp Mode)
FP - Fuel Pump Relay (Ford)
FP - Fuel Pump
FPM - Fuel Pump Monitor (in PCM)
FPRC - Fuel Pump Regulator Control
FRC - Forced
FRP - Fuel Rail Pressure
FRT - Fuel Rail Temperature
FRZ - Freeze Frame
FT - Fuel Trim
FTL - Fuel Tank Level Sensor
FTO - Filtered Tachometer Output
FTP - Fuel Tank Pressure
FTT - Fuel Tank Temperature
FWD - Front Wheel Drive
g/sec - Grams per Second
GA - Gage
GCM - Governor Control Module
GCW - Gross Combination Weight
GDC - Fuel Data Centre
GDI - Gasoline Direct Injection
GEM - Generic Electronic Module
GEN - Generator (Alternator)
GND - Electrical Ground Connection
GOOSE - Brief Throttle Open/Close
GPM - Grams Per Mile
GPS - Governor Pressure Sensor
GST - Generic Scan Tool
GVW - Gross Vehicle Weight
H - Hydrogen
H/CMPR - High Compression
H2O - Water
HAC - High Altitude Compensator
HAIS - Heated Air Intake System (Chrysler)
HBV - Heater Blower Voltage
HC - Hydrocarbons
HCDS - High Clutch Drum Speed
HCV - Hydrocarbon (Ford)
HCV - Exhaust Heat Control Valve (Ford)
HD - Heavy Duty
HDC - Heavy Duty Cooling
HDR-CKP - High Data Rate CKP Sensor
HEGO - Heated Exhaust Gas Oxygen Sensor
HEI - High Energy Ignition (GM)
HFC - High (speed) Fan Control
HFP - High Fuel Pump (Relay) Control
Hg - Mercury
HIC - Hot-Idle Compensator (Ford)
HLOS - Hardware Limited Operation System
HO - High Output
HO2S - Heated Oxygen Sensor
HO2S-1-1 - Bank One Sensor One Signal
HO2S-1-2 - Bank One Sensor Two Signal
HO2S-1-3 - Bank One Sensor Three Signal
HO2S-2-1 - Bank Two Sensor One Signal
HO2S-2-2 - Bank Two Sensor Two Signal
hp - Horsepower
HPC - High Pressure Cut off
HPL - High Pressure Liquid
HPS - High Performance System
HPV - High Pressure Vapour
HSC - High Swirl Combustion
HT - High Tension
HUD - Heads Up Display
HVAC - Heater Ventilation and Air Conditioning
HVACM - Heater-Vent-Air Conditioning Module
HVS - High Voltage Switch
Hz - Hertz
I/M - Inspection and Maintenance
I/O - Input / Output
I/P - Instrument Panel
IA - Intake Air
IAC - Idle Air Control (motor or solenoid)
IACV - Idle Air Control Valve
IAS - Inlet Air Solenoid (Ford)
IAT - Intake Air Temperature
IBP - Integral Back Pressure
IC - Integrated Circuit
IC - Ignition Control 
ICM - Ignition Control Module
ICP - Injection Control Pressure
ICS - Idle Control Solenoid (GM)
ID - Inside Diameter
IDI - Integrated Direct Ignition
IDL - Idle Position Switch
IDM - Ignition Diagnostic Monitor
IDM - Injector Driver Module
IFI - Indirect Fuel Injection
IFS - Inertia Fuel Switch
IGN - Ignition
IGN ADV - Ignition Advance
IGN GND - Ignition Ground 
ILC - Idle Load Compensator
IMA - Idle Mixture Adjuster
IMRC - Intake Manifold Runner Control
IMS - Ignition Module Signal
IMS - Inferred Mileage Sensor (Ford)
IMT - Intake Manifold Timing
INJ 1 to INJ 10 - Fuel Injectors 1 to 10
INT - Integrator (replaced with ST FUEL TRIM)
IPC - Instrument Panel Cluster
IPR - Injector Pressure Regulator
IRCM - Integrated Relay Control Module
ISA - Idle Speed Actuator
ISC - Idle Speed Control
ISO - International Standard of Organization
ISS - Input Shaft Speed
ITA - Ignition Timing Adjustment
ITCS - Ignition Timing Control System (Honda)
ITS - Idle Tracking Switch
IVS - Idle Validation Switch
IVSC - Integrated Vehicle Speed Control
IVV - Idle Vacuum Valve (Ford)
JAS - Jet Air System (Mitsubishi)
JSV - Jet Mixture Solenoid Valve
KAM - Keep Alive Memory
KAPWR - Direct Battery Power
KD - Kick down
KDLH - Kick down Low Hold
Kg/cm2 - Kilograms/ Cubic Centimetres
kHz - Kilohertz
Km - Kilometres
KOEC - Key On, Engine Cranking
KOEO - Key On, Engine Off
KOER - Key On, Engine Running
KPA - Kilopascal
KS - Knock Sensor
KSM - Knock Sensor Module
L - Litres
L4 - Four Cylinder Inline Engine
LAMBSE - Short Term Fuel Trim
LCD - Liquid Crystal Display
LED - Light Emitting Diode
LFC - Low Fan Control
LFP - Low Speed Fuel Pump Control
LHD - Left Hand Drive
LOAD - Calculated Load Value
LOC - Light Off Catalyst
LONGFT - Long Term Fuel Trim
LOOP - Engine Operating Loop Status
LOS - Limited Operating Strategy
LPG - Liquid Petroleum Gas
LSS - Linear Shift Solenoid
LTFT - Long Term Fuel Trim
LTS - Low Coolant Switch
LUS - Lock-Up Solenoid
LV8 - Load Variable
LWB - Long Wheel Base
M/C - Mixture Control
M/T - Manual Transmission
MAF - Mass Air Flow Sensor
MAF RTN - Mass Airflow Sensor Ground
MAP - Manifold Absolute Pressure Sensor
MAS - Mixture Adjust Screw
MAT - Manifold Air Temperature
MC - Mixture Control
MCS - Mixture Control Solenoid (GM)
MCT - Manifold Charge Temperature Sensor (Ford)
MCU - Microprocessor Control Unit (Ford)
MCV - Manifold Control Valve (Ford)
MDP - Manifold Differential Pressure
MECS - Mazda Electronic Control System
MEMCAL - Memory Calibration
MFI - Multiport Fuel Injection
MIC - Mechanical Instrument Cluster
MIL - Malfunction Indicator Lamp
MISAR - Micro processed Sensing and Automatic Regulation 
MLP - Manual Lever Position
MLUS - Modulated Lock Up Solenoid or its Control Circuit (Ford)
MLVLPS - Manual Valve Lever Position
MPFI - Multi-Port Fuel Injection
MPG - Miles Per Gallon
MPH - Miles Per Hour
MPI - Multi Port Injection
mS or ms - Millisecond
MSFF - Miles Since First Fail
MSLF - Miles Since Last Fail
MST - Manifold Surface Temperature
MT - Manual Transmission
MTV - Manifold Tune Valve
mV or mv - Milivolt
MVLPS - Manual Valve Lever Position
MVZ - Manifold Vacuum Zone
N - Nitrogen
N.C. - Normally Closed Position
N.O. - Normally Open Position
N/MIL - A Code Set Without a MIL Request
N/V - Input Shaft Speed to Vehicle Speed
NDIR - Non Dispersive Infrared
NDS - Neutral Drive Switch
NGS - Neutral Gear Switch (Ford)
NGV - Natural Gas Vehicles
Nm - Newton Meters
NOx - Oxides of Nitrogen
NTC - Negative Temperature Coefficient
NVRAM - Non Volatile Random Access Memory
O2 - Oxygen
O2S-11 - Oxygen Sensor Signal (Bank 1)
O2S-21 - Oxygen Sensor Signal (Bank 2)
OASIS - Ford Motor Company Online Automotive Service Information System
OBD I - On Board Diagnostics Version I
OBD II - On Board Diagnostics Version II
OBD STAT - On Board Diagnostic System Status
OC - Oxidation Catalytic Converter
OCC - Output Circuit Check (Ford)
OCIL - Overdrive Cancel Indicator Lamp
OCS - Overdrive Cancel Switch
OCT ADJ - Octane Adjust Fuel Switch
OD - Overdrive
OD - Outside Diameter
ODM - Output Device Monitor
ODS - Overdrive Drum Speed
OE - Original Equipment
OEM - Original Equipment Manufacturer
OHC - Overhead Cam Engine
OHV - Over Head Valve
OL - Open Loop
ORC - Oxidation Reduction Converter
OS - Oxygen Sensor
OSAC - Orifice Spark Advance Control (Chrysler)
OSC - Output State Check (Ford)
OSM - Output State Monitor
OSS - Output Speed Shaft
OTIS - Overhead Travel Information System
OVCV - Outer Vent Control Valve
P/B - Power Brakes
P/E - Power Enrichment 
P/N - Part Number
P/S - Power Steering
PA - Pressure Air (Honda)
PAFS - Pulse Air Feeder System (Chrysler)
PAIR - Pulsed Secondary Air Injection
PAS - passive Anti-Theft System
PAS - Power Assisted Steering
PASS - Personalized Automotive Security System
PC - Pressure Control
PCB - Printed Circuit Board
PCI - Programmable Communications Interface
PCM - Power train Control Module
PCS - Pressure Control Solenoid
PCV - Positive Crankcase Ventilation
PECV - Power Enrichment Control Valve
PF - Purge Flow Sensor
PFE - Pressure Feedback EGR Sensor
PFI - Port Fuel Injection
PFI - Port Fuel Injection (GM)
PGM-FI - Programmed Gas Management Fuel Injection (Honda)
PID - Parameter Identification Location
PID SUP - Parameter Identification Supported
PIP - Profile Ignition Pickup Signal
PIV - Peak Inverse Voltage
PKE - Passive Keyless Entry
PMD - Pump Mounted Driver
PNP - Par Neutral Position
POT - Potentiometer
PPM - Parts Per Minute
PPS - Ported Pressure Switch (Ford)
PR - Pressure Relief
PRC - Pressure Regulator Control
PRNDL - Switch
PROM - Programmable Read-Only Memory
PS - Power Steering
PSA - Pressure Switch Assembly
PSC - Power Steering Control
PSI - Pounds Per Square Inch
PSOM - Programmable Speedometer Odometer Module
PSOV - Purge Shut Off Valve (Ford)
PSP - Power Steering Pressure 
PSPS - Power Steering Pressure Switch
PTC - Positive Temperature Coefficient Resistor
PTO - Power Take Off (4WD Option)
PTOX - Periodic Trap Oxidizer
PTU - Part Throttle Unlock
PVA - Ported Vacuum Advance
PVS - Ported Vacuum Switch
PWM - Pulse Width Modulation
PWR GND - Power Ground for PCM
QDM - Quad Driver Module
RABS - Rear Antilock Brake System
RAM - Random Access Memory
RAP - Retained Access Power
RECAL - Calibration Adjustment
REDOX - Reduction Oxidation Converter
REF - Reference
RFI - Radio Frequency Interference
RHD - Right Hand Drive
RKE - Remote Keyless Entry
RM - Relay Module
ROM - Read Only Memory
RON - Rated Octane Number
RPM - Revolutions Per Minute
RRS - Variable Reluctance Sensor
RTD - Real Time Dampening
RTN - Dedicated Sensor Ground Circuit
RTV - Room Temperature Vulcanizing
RVP - Reid Vapour Pressure
RWAL - Rear Wheel Anti-Lock
RWD - Rear Wheel Drive
S4WD - Selectable Four Wheel Drive
SAE - Viscosity Grade
SA-FV - Separator Assembly Fuel/Vacuum
SAVM - Spark Advance Vacuum Modulator
SAW - Spark Angle Work
SBDS - Service Bay Diagnostic System
SBEC - Single Board Engine Controller (replaced with PCM0
SBS - Boost Solenoid (Ford)
SBT - Serial Bus Traveler
SC - Supercharged Engine
SCAP - Silicone Capacitance Absolute Pressure Sensor (Ford)
SCB - Supercharger Bypass
SCC - Spark Control Computer (Chrysler)
SCP - Standard Corporate Protocol
SDI - Saab Direct Ignition
SDM - Sensing Diagnostic Module
SDV - Spark Delay Valve
SDV - Spark Deceleration Valve
SEFI - Sequential Electronic Fuel Injection
SEO - Special Equipment Option
SES - Service Engine Soon (replaced with MIL)
SFI - Sequential Fuel Injection
SHED - Sealed Housing Evaporative Determination System
SHO - Super High Output Engine
SHRT FT - Short Term Fuel Trim
SHRTFT1 - Short Term Fuel Trim Bank 1
SIG RTN - Signal Return (sensor ground)
SIL - Shift Indicator Lamp
SIPS - Side Impact Protections System
SIR - Supplemental Inflatable Restraint
SIS - Solenoid Idle Stop
SMEC - Single Module Engine Controller (replaced with PCM)
SMPI - Sequential Multiport Fuel Injection (Chrysler)
SO2 - Sulphur Dioxide
SOHC - Single Overhead Cam
SPD - Speed
SPFI - Single Point Fuel Injection (throttle body)
SPI - Serial Peripheral Interface
SPL - Smoke Puff Limiter
SPOUT - Spark Output Signal
SPS - Service Programming System
SRC - Selective Ride Control
SRDV - Spark Retard Delay Valve
SRI - Service Reminder Indicator
SRS - Spark Retard Solenoid
SRS - Supplemental Restraint System (air bag)
SRT - System Readiness Test
SS - Speed Sensor (Honda)
SS1, SS2,etc. - Shift Solenoid 1, 2, etc.
SSI - Solid State Ignition (Ford)
ST - Scan Tool
STAR - Self Test Automatic Readout
STI - Self Test Input
STI - Self-Test Input (Ford)
STO - Self Test Output
STO - Self-Test Output (Ford)
STS - Service Throttle System (lamp) 
SUSP - Suspension System Module
SVV - Solenoid Vent Valve (Ford)
SWB - Short Wheel Base
TA - Temperature Air (Honda)
TAB - Thermostat Air Bypass
TAC - Throttle Actuator Control
TAC - Thermostatic Air Cleaner (GM)
TACH - Tachometer
TAD - Thermostat Air Diverter
TAP - Transmission Adaptive Pressure
TAV - Temperature Actuated Vacuum
TBI - Throttle Body Injection
TC - Turbocharger
TCA - Thermostat Controlled Air Cleaner
TCC - Torque Converter Clutch
TCCP - Torque Converter Clutch Pressure
TCCS - Toyota Computer Controlled System
TCIL - Transmission Control Indicator Lamp
TCM - Transmission Control Module
TCP - Torque Charger
TCP - Temperature Compensated Accelerator Pump (Ford)
TCS - Traction Control Switch
TCS - Transmission Control Switch
TCS - Transmission Controlled Spark (GM)
TD - Turbo Diesel
TDC - Top Dead Center
TDI - Turbo Direct Injection
TE - Thermal Expansion
TFP - Transmission Fluid Pressure
TFP - Throttle Fluid Pressure
TFT - Transmission Fluid Temperature
THM - Turbo Hydra-Matic
TI - Transistorized Ignition System
TIC - Thermal Ignition Control (Chrysler)
TIV - Thermactor Idle Vacuum Valve (Ford)
TK - Throttle Kicker Actuator (Ford)
TKS - Throttle Kicker Solenoid
TOT - Transmission Oil Temperature
TP - Throttle Position
TP Mode - Throttle Position Mode
TPCV - Tank Pressure Control Valve
TPI - Tuned Port Injection
TPM - Tire Pressure Monitor
TPP - Throttle Position Potentiometer
TPS - Throttle Position Sensor
TPT - Throttle Position Transducer (Chrysler)
TR - Transmission Range Sensor
TRLHP - Thermal Vacuum Valve
TRS, TRS+1 - Transmission Regulated Spark Control System
TSB - Technical Service Bulletin
TSP - Throttle Solenoid Positioner (Ford)
TSS - Transmission Shaft Speed Sensor
TSS - Turbine Speed Shaft Sensor
TV - Throttle Valve
TVS - Temperature Vacuum Switch 
TVV - Thermal Vent Valve (Ford)
TWC - Three Way Catalyst
TWC + OC - Three Way Catalyst
UART - Universal Asynchronous Receiver-Transmitter
UD - Under drive
UIDI - Up-Integrated Direct Ignition
V - Volts
VAC - Vacuum
VAF - Vane Airflow Meter
VAF - Volume Air Flow
VAT - Vane Air Temperature Sensor
VATS - Vehicle AntiTheft System
VBAT - Vehicle (system) Battery Voltage
VCC - Vacuum Cut Control Solenoid
VCM - Vehicle Control Module
VCRM - Variable Control Relay Module
VCTS - Vacuum Control Temperature Sensing Valve (Ford)
VCV - Vacuum Control Valve (Ford)
VDOT - Variable Displacement Orifice Tube
VDV - Vacuum Delay Valve
VDV - Vacuum Differential Valve (Ford)
VECI - Vehicle Emission Control Information Decal
VF - Vacuum Fluorescent
VIM - Vehicle Interface Module
VIN - Vehicle Identification Number
VIS - Variable Induction System
VLCM - Variable Load Control Module 
VMV - Vapor Management Valve (EVAP)
VMV - Vacuum Modulator Valve
VNT - Variable Nozzle Turbocharger
VOTM - Vacuum Operated Throttle Modulator (Ford)
VPWM - Variable Pulse Width Modulated
VPWR - Ignition Switched Power
VR - Voltage Regulator
VR/S - Vacuum Regulator/Solenoid (Ford)
VRDV - Vacuum Retard Delay Valve (Ford)
VREF - Reference Voltage (from PCM)
VRESER - Vacuum Reservoir (Ford)
VREST - Vacuum Restrictor (Ford)
VRIS - Variable Resonance Induction System
VRS - Variable Reluctance Sensor
VRV - Vacuum Regulator Valve (Ford)
VSS - Vehicle Speed Sensor
VVA - Venturi Vacuum Amplifier (Ford)
VVC - Variable Voltage Choke (Ford)
VVV - Vacuum Vent Valve (Ford)
W/B - Wheelbase
WAC - WOT A/C Cut out Relay
WACA - A/C WOT Cut out Relay Monitor
WOT - Wide Open Throttle
WOTV - Wide-Open Throttle Valve (Ford)
WSS - Wheel Speed Sensor
WU OC - Warm Up Oxidation Catalytic Converter
WU TWC - Warm Up Three Way Catalytic Converter
AAC: Auxiliary Air Control 
AAV: Anti After burn Valve 
ABS: Anti-lock Brake System 
A/C: Air Conditioning 
ACC: Accessory Position 
ACL: Air Cleaner (Thermostatic Type) 
ACM: Air Bag Control Module 
ACR-4: Air Conditioning Refrigerant, Recovery, Recycling, Recharging 
ACT: Air Charge Temperature 
A/D: Analogue to Digital 
AECM: Air Bag Electronic Control Module 
A/F: Air/Fuel Ratio 
AIR: Secondary Air Injection 
AIRB: Secondary Air Injection Bypass 
AIRD: Secondary Air Injection Diverter 
AIS: Secondary Air Injection 
ALDL: Assembly Line Diagnostic Link 
AM1: Thermactor Air Management 1 (TAB) 
AM2: Thermactor Air Management 2 (TAB or TAD) 
AP: Accelerator Pedal 
API: American Petroleum Institute 
APP: Accelerator Pedal Position 
APS: Accelerator Position Sensor 
ARS: Automatic Restraint System 
ASD: Automatic Shutdown 
ASDM: Air Bag System Diagnostic Module 
ASR: Automatic Slip Regulation 
A/T: Automatic Transaxle or Transmission 
ATC: Active Transfer Case 
ATDC: After Top Dead Centre 
BAP: Barometric Atmosphere Pressure 
BAR: Bureau of Auto Repair 
BARO: Barometric Pressure 
BBL: Barrel 
BCM: Body Control Module 
BID: Breaker less Inductive Discharge 
BOB: Breakout Box 
BOO: Brake On/Off 
BP: Barometric Pressure 
BPA: Bypass Air 
BPT: Backpressure Transducer 
BTDC: Before Top Dead Centre 
BVT: Backpressure Variable Transducer 
B+: Battery Positive Voltage 
C: Continuous Memory 
CA: California 
CAB: Controller Anti-lock Brake 
CAC: Charge Air Cooler 
CANP: Canister Purge 
CARB: California Air Resources Board 
CARB: Carburettor 
CAT: Catalytic Converter 
CBD: Closed Bowl Distributor 
CCA: Centre Control Assembly 
CCC: Converter Clutch Control Solenoid 
CCCI:Computer Controlled Coil Ignition 
CCD:Chrysler Collision Detection 
CCD: Computer Controlled Dwell 
CCECS: Computer Controlled Emission Control System 
CCO: Converter Clutch Overdrive Solenoid 
CCOT: Cycling Clutch Orifice Tube 
CCP: Carbon Canister Purge 
CCRM: Constant Control Relay Module 
CEC: Computerized Emission Control System 
CES: Clutch Engage Switch 
CFRM: Condenser Fan Relay Module 
CID: Cylinder Identification 
CID:Cubic Inch Displacement 
CIS: Constant Injection System 
CIS-E: Constant Injection System Electronic 
CKP: Crankshaft Position Sensor 
CLECS: Closed Loop Emission Control System 
CLFCS: Closed Loop Fuel Control System 
CMFI: Central Multi-Port Fuel Injection 
CMP: Camshaft Position Sensor 
CMTC: Compass/Mini-Trip Computer 
CNG: Compressed Natural Gas 
CO: Carbon Monoxide 
COP: Coil On Plug 
CO2: Carbon Dioxide 
CP: Canister Purge 
CP: Crankshaft Position 
CPP: Clutch Pedal Position 
CPU:Central Processing Unit 
CSF: Crankshaft Speed Fluctuation 
CSFI: Central Sequential Fuel Injection 
CTM: Central Timer Module 
CTOX: Continuous Trap Oxidizer 
CTP: Closed Throttle Position 
CVVT: Continuous Variable Valve Timing 
CYP: Cylinder Position 
C3: Computer Command Control 
C-4:Computer Controlled Catalytic Converter 
DAB: Driver Air Bag 
DCL: Data Communications Link 
DDS: Driveline Disengagement Switch 
DEC: Diesel Engine Control 
DERM: Diagnostic Energy Reserve Module 
DFI: Digital Fuel Injection 
DI: Distributor Ignition 
DIC:Driver Information Center 
DIS: Distributorless Ignition System 
DIS: Direct Ignition System 
DLC: Data Link Connector 
DME: Digital Motor Electronics 
DMIVA: Distributor Mounted Ignition Vacuum Advance 
DOHC: Dual Overhead Camshaft 
DPFE: Differential Pressure Feedback EGR 
DPI: Dual Plug Ignition 
DRB: Diagnostic Readout Box 
DRB II:Diagnostic Readout Box II 
DRB III: Diagnostic Readout Box III 
DRL: Daytime Running Lamps 
DS-I: Dura Spark I Ignition System 
DS-II: Dura Spark II Ignition System 
DSAS: Deceleration Spark Advance System 
DSS: Downshift Solenoid 
DTC: Diagnostic Trouble Code 
DTM: Diagnostic Test Mode 
DVOM:Digital Volt Ohm Meter 
EAIR: Electronic Secondary Air Injection 
EAT: Electronically Controlled Automatic Transaxle Or Transmission 
EBCM: Electronic Brake Control Module 
EBL: Electric Back Lite (Rear Window Defroster) 
EBP: Exhaust Back Pressure 
ECA:Electronic Control Assembly 
ECCS: Electronic Concentrated Engine Control System 
ECITS:Electronic Control Ignition Timing System 
ECL: Engine coolant Level 
ECM: Engine Control Module 
ECT: Engine Coolant Temperature 
ECTF: Cooling Fan Engine Coolant Temperature 
ECU: Engine Control Unit 
EDF: Electro Drive Fan 
EDFI: Electronic Diesel Fuel Injection 
EDI: Electronic Controlled Direct Ignition System 
EDIS: Electronic Distributorless Ignition System 
EDL: Engine Data Line 
EEC-I: Electronic Engine Control I 
EEC-II: Electronic Engine Control II 
EEC-III: Electronic Engine Control III 
EEC-IV: Electronic Engine Control IV 
EEC-V: Electronic Engine Control V 
EEPROM: Electronically Erasable Programmable Read Only Memory 
EET: Electronic EGR Transducer 
EFC: Electronic Feedback Carburetor 
EFE: Early Fuel Evaporation 
EFI:Electronic Fuel Injection 
EGO: Exhaust Gas Oxygen Sensor 
EGR: Exhaust Gas Recirculation 
EEGR: Electronic EGR Valve 
EGRC: EGR Control 
EGRT:EGR Temperature 
EGRV: EGR Vent 
EI: Electronic Ignition 
EIC: Electronic Instrument Cluster 
EICU: Electronic Ignition Control Unit 
EITC: Electronic Ignition Timing Control 
ELB: Electronic Lean Burn System 
ELC: Electronic Level Control 
ELCD: Evaporative Loss Control Device 
ELD: Electric Load Detector 
EMR: Electronic Module Retard 
EOP: Engine Oil Pressure 
EOT:Engine Oil Temperature 
EPA: Environmental Protection Agency 
EPC: Electronic Pressure Control 
EPR: Exhaust Back Pressure Regulator 
EPROM: Erasable Programmable Read Only Memory 
EPT: EGR Pressure Transducer 
ESA: Electronic Spark Advance 
ESC: Electronic Spark Control 
ESS: Engine Speed Sensor 
EST:Electronic Spark Timing 
ETC: Electronic Temperature Control 
ETC: Electronic Throttle Control 
ETCS-i: Electronic Throttle Control System-intelligent 
ETW: Equivalent Test Weight 
EVAP: Evaporative Emission Control System 
EVIC: Electronic Vehicle Information Center 
EVO: Electronic Variable Orifice 
EVP: EGR Valve Position 
EVR: EGR Vacuum Regulator 
EVSV: Electronic Vacuum Switching Valve 
EWL: Engine Warning Lamp 
EZL:Electronic Ignition System With Variable Characteristics 
FBC: Feedback Carburetor 
FDCS: Fuel Demand Command Signal 
FED: Federal 
FEEPROM: Flash Electrically Erasable Programmable Read Only Memory 
FEPROM: Flash Electrically Programmable Read Only Memory 
FF: Flexible Fuel 
FI:Fuel Injection 
FMEM: Failure Mode Effects Management 
FMI: Failure Mode Identifiers 
FPM: Fuel Pump Monitor 
FPCM: Fuel Injection Pump Control Module 
FPRC: Fuel Pressure Regulator Control 
FR: Fillpipe Restrictor 
FSS: Flexible Service System 
GFD:Generic Field Data 
GFP: Gaseous Fuel Prep 
GPC: Glow Plug Control 
GPL: Glow Plug Wait Lamp 
GPM: Gallons Per Minute 
gpm: Grams Per Million 
GPR: Glow Plug Relay 
GVW: Gross Vehicle Weight 
GVWR: Gross Vehicle Weight Rating 
HC: Hydrocarbons 
HCU: Hydraulic Control Unit 
HD: Heavy Duty 
HDC: Heavy Duty Emission Cycle 
HE: Hall Effect 
HEDF: High Electro Drive Fan 
HEGO: Heated Exhaust Gas Oxygen Sensor 
HEI: High Energy Ignition System 
HEUI: Hydraulically Actuated Electronically Controlled Unit Injectors 
HFAN: High Speed Cooling Fan 
HFC: High Fan Control 
HFM: Hot Film Air Mass Sensor 
HO: High Output 
HO2S: Heated Oxygen Sensor 
HSC:High Swirl Combustion 
HSIA: High Speed Inlet Air Control 
HVAC: Heater Vent Air Conditioning 
HVS: High Voltage Switch Ignition System 
IAC: Idle Air Control 
IACV-AAC: Idle Air Control Valve-Auxiliary Air Control Valve 
IAT: Intake Air Temperature 
IC: Ignition Control 
ICM: Ignition Control Module 
ICP: Injector Control Pressure 
ICS:Ignition Control System 
ICTO: Ignition Coolant Temperature Override 
IDI: Indirect Diesel Injection 
IDI: Indirect Fuel Injection 
IDM: Ignition Diagnostic Monitor 
IDM: Injector Driver Module 
ILEV: Inherently Low Emissions Vehicle 
IMRC: Intake Manifold Runner Control 
IMT: Intake Manifold Temperature 
IOD: Ignition Current Off Draw 
IPR:Injection Control Pressure Regulator 
ISC:Idle Speed Control 
ITS: Idle Tracking Switch 
IVS: Idle Validation Switch 
JTEC: Jeep Truck Powertrain Control Module System 
KAM: Keep Alive Memory 
KOEO: Key On Engine Off 
KOER: Key On Engine Running 
KS:Knock Sensor 
LCD: Liquid Crystal Display 
LDP: Leak Detection Pump 
LED: Light Emitting Diode 
LEV: Low Emissions Vehicle 
LFAN:Low Speed Cooling Fan 
LH: Lefthand 
LPG: Liquid Propane Gas 
LPT: Light Pressure Turbo 
LUS:Lock-Up Solenoid 
LVW: Loaded Vehicle Weight 
M/CCC: Modulated Converter Clutch Control 
MAF: Mass Air Flow 
MAP: Manifold Absolute Pressure 
MAT: Manifold Air Temperature 
MC-VAF: Measuring Core Volume Air Flow 
MCC: Manifold Catalytic Converter 
MCCA:Message Center Control Assembly 
MCS:Mixture Control System 
MCU: Microprocessor Control Unit 
MDP: Manifold Differential Pressure 
MEMCAL: Memory Calibration Unit 
MFI: Multi-Port Fuel Injection 
MIC: Mechanical Instrument Cluster 
MID: Message Identifier 
MIL: Malfunction Indicator Lamp 
MPI: Multi-Port Injection 
MLP: Manual Lever Position 
MLUS: Modulator Lock-Up Solenoid 
MST: Manifold Surface Temperature 
M/T: Manual Transaxle Or Transmission 
MTA: Managed Thermactor Air 
MUI: Mechanical Unit Injection 
MUT II: Multi-Use Tool, Second Edition 
NGS: New Generation Star Tester 
NGV: Natural Gas Vehicle 
NOx: Oxides Of Nitrogen 
NVRAM: Non Volatile Random Access Memory 
O: Key On Engine Off 
OBD: On-Board Diagnosis 
OBD II: On-Board Diagnosis II 
OC:Oxidation Catalytic Converter 
OCC: Output Circuit Check 
ODO: Odometer 
ODM: Output Driver Module 
OHC: Overhead Cam 
ORVR: On Board Refueling Vapor Recovery 
OSAC: Orifice Spark Advance Control 
OSC: Output State Control 
OSS: Output Shaft 
OSS: Output Speed Sensor 
OTIS: Overhead Travel Information System 
OWL: Oil/Water Warning Lamp 
O2S:Oxygen Sensor 
PAB: Passenger Air Bag 
PAD: Passenger Air Bag Disable 
PAG: Polyalkaline Glycol 
PAIR: Pulsed Secondary Air Injection 
PCI: Programmable Communication Interface 
PCM: Powertrain Control Module 
PCV: Positive Crankcase Ventilation 
PDC: Power Distribution Center 
PFE:Pressure Feedback EGR 
PG: Pulse Generator 
PGM-CARB: Programmed Carburetor 
PGM-FI: Programmed Fuel Injection Control System 
PGM-IG: Programmed Ignition 
PID: Parameter Identifier 
PIP: Profile Ignition Pickup 
PNP:Park/Neutral Position 
ppm: Parts Per Million 
PRC: Pressure Regulator Control 
PROM: Programmable Read Only Memory 
PSI: Pounds Per Square Inch 
PSP: Power Steering Pressure 
PSPS: Power Steering Pressure Switch 
PTEC: Powertrain Electronic Controller Management System 
PTO: Power Take Off 
PWM: Pulse Width Modulated 
R: Key On Engine Running 
RABS: Rear Anti-lock Braking System 
RAM: Random Access Memory 
RAP: Retained Accessory Power 
RDS: Radio Data System 
REDOX: Reduction Oxidation Catalytic Converter 
REGT: Recirculated Exhaust Gas Temperature 
RFI: Radio Frequency Interference 
RH: Righthand 
RKE: Remote Keyless Entry 
ROM: Read Only Memory 
RON: Research Octane Number 
RPM: Revolutions Per Minute 
RPS:Revolutions Per Second 
SAW: Spark Angle Word 
SBEC: Single Board Engine Control 
SC: Supercharger 
SCC: Spark Control Computer 
SCCS:Speed Control Command Switches 
SCS: Speed Controlled Spark 
SFI: Sequential Multi-Port Fuel Injection 
SFTP: Supplementary Federal Test Procedure 
SHO: Super High Output 
SID: Subsystem Identifier 
SIL: Shift Indicator Lamp 
SKIM: Smart Key Immobilizer Module 
SMEC: Single Module Engine Control 
SOHC:Single Overhead Camshaft 
SO2: Sulfur Dioxide 
SPCS: Spark Plug Switching Control System 
SPI: Serial Peripheral Interface 
SPK: Spark Control 
SPOUT: Spark Output 
SRI: Service Reminder Indicator 
SRS:Supplemental Restraint System 
SS: Shift Solenoid 
SSI: Solid State Ignition 
SST: Special Service Tool 
STAR: Self-Test Automatic Readout 
STC: Spark Timing Control 
STI:Self-Test Input 
STO: Self-Test Output 
SULEV: Super Ultra Low Emissions Vehicle 
SVO: Special Vehicle Operations 
SVT: Special Vehicle Team 
TAB: Thermactor Air Bypass Vacuum Solenoid Valve 
TAC: Tachometer Output Signal 
TAD: Thermactor Air Diverter Vacuum Solenoid Valve 
TBI: Throttle Body Fuel Injection 
TC: Turbocharger 
TCC:Torque Converter Clutch 
TCS: Transmission Controlled Spark 
TDC: Top Dead Centre 
TFI-I: Thick Film I Ignition System 
TFI-IV: Thick Film IV Ignition System 
TFT: Transmission Fluid Temperature 
TI Transistor Ignition System 
TLEV: Transitional Low Emission Vehicle 
TOT: Transmission Oil Temperature 
TP: Throttle Position 
TP: Throttle Positioned 
TPI: Tuned Port Injection 
TPOUT: Throttle Position Output 
TPS: Throttle Position Sensor 
TRS: Transmission regulated Spark 
TSB: Technical Service Bulletin 
TSS: Transmission Speed Sensor 
TSS: Turbine Speed Sensor 
TTS: Transaxle Temperature Switch 
TV: Throttle Valve 
TVP: Throttle Valve Potentiometer 
TVV: Thermal Vacuum Valve 
TWC: Three-Way Catalytic Converter 
TWC+OC: Three-Way + Oxidation Catalytic Converter 
UIC: Universal Integrated Circuit Ignition 
ULEV: Ultra Low Emissions Vehicle 
UVC: Under Valve Cover 
VAF: Vane Air Flow 
VAF:Volume Air Flow 
VANOS: Double Variable Camshaft Control 
VAT: Vane Air Temperature 
VCM: Vehicle Control Module 
VCRM: Variable Control Relay Module 
VDV: Vacuum Delay Valve 
VEPS:Vehicle Electronic Programming System 
VFD:Vacuum Fluorescent Display 
VIC: Vehicle Information Center 
VICS: Variable Inertia Charging System 
VIN: Vehicle Identification Number 
VIT: Vehicle Interface Tool 
VPM: Vehicle Personality Module 
VP-20: Bosch VP-20 Diesel Engine Control System 
VRE: Vehicle Retarded Enable 
VREF: Reference Voltage 
VRV: Vacuum Regulator Valve 
VSS:Vehicle Speed Sensor 
VTEC: Variable Valve Timing & Valve Lift Electronic Control 
VTSS: Vehicle Theft Security System 
VVTi: Variable Valve Timing With Intelligence 
WAC: Wide Open Throttle A/C Cut off 
WOT: Wide Open Throttle 
WOTPS: Wide Open Throttle Position Switch 
WSS: Wheel Speed Sensor 
WU-OC: Warm-Up Oxidation Catalytic Converter 
WU-TWC: Warm-Up Three-Way Catalytic Converter 
ZEV: Zero Emissions Vehicle 
1 BBL: 1 Barrel Carburettor 
2 BBL: 2 Barrel Carburettor 
3 BBL:3 Barrel Carburettor 
4 BBL: 4 Barrel Carburettor 
2 VH: 2 Valve Head 
4 VH: 4 Valve Head 
A/C = Air Conditioning
A/F = Air/Fuel Ratio
A/T = Automatic Transmission or Transaxle
ABS = Antilock Braking System
ABSV = Air Bypass Solenoid Valve
AC = Alternating Current
ACTS = Air Charge Temperature Sensor
AFC = Air Flow Control
AFM = Air Flow Meter
AFS = Air Flow Sensor
ALCL = Assembly Line Communications Link
ALDL = Assembly Line Data Link
APS = Absolute Pressure Sensor
APS = Atmospheric Pressure Sensor
ASDM = Airbag System Diagnostic Module
ATDC = After Top Dead Centre
ATF = Automatic Transmission Fluid
ATS = Air Temperature Sensor
AWD = All Wheel Drive
-
B+ = Battery Positive Voltage
BARO = Barometric Pressure
BAT = Battery
BCM = Body Control Module
BHP = Brake Horse Power
BMAP = Barometric/Manifold Absolute Pressure Sensor
BPS = Back pressure Sensor
BPT = Back Pressure Transducer
BTDC = Before Top Dead Center
Btu = British Thermal Units
C = Celsius
C3I = Computer Controlled Coil Ignition
CALPAK = Calibration Pack
CAN = Controller Area Network
CANP = Canister Purge Solenoid Valve
CAS = Crank Angle Sensor
CC = Cubic Centimetres
CDI = Capacitor Discharge Ignition
CEAB = Cold Engine Air Bleed
CECU = Central Electronic Control Unit
CER = Cold Enrichment Rod
CESS = Cold Engine Sensor Switch
CFI = Central Fuel Injection
CFI = Continuous Fuel Injection
cfm = Cubic Feet Per Minute
CID = cylinder identification sensor
CID = Cubic Inch Displacement
CIS = Continuous Injection System
CKP = Crankshaft Position Sensor
CMP = Camshaft Position Sensor
CO = Carbon Monoxide
CO2 = Carbon Dioxide
COP = Coil On Plug ignition
CPI = Central Port Injection
CPU = Central Processing Unit
CSSA = Cold Start Spark Advance
CSSH = Cold Start Spark Hold
CTS = Coolant Temperature Sensor
CTVS = Choke Thermal Vacuum Switch
CVR = Control Vacuum Regulator
dB = Decibels
DC = Direct Current
DEFI = Digital Electronic Fuel Injection
DFS = Deceleration Fuel Shutoff
DIS = Distributorless Ignition System
DIS = Direct Ignition System
DLC = Data Link Connector
DOHC = Double OverHead Camshaft
DPF = Diesel Particulate Filter
DTC = Diagnostic Trouble Code
DVOM = Digital Volt Ohm Meter
E2PROM = Electrically Erasable Programmable Read Only Memory
EACV = Electronic Air Control Valve
EBCM = Electronic Brake Control Module
EBM = Electronic Body Module
ECA = Electronic Control Assembly
ECM = Engine Control Module
ECT = Engine Coolant Temperature
ECU = Electronic Control Unit
EDIS = Electronic Distributorless Ignition System
EEPROM = Electronically Erasable Programmable Read Only Memory
E2PROM = Electronically Erasable Programmable Read Only Memory
EFC = Electronic Fuel Control
EFCA = Electronic Fuel Control Assembly
EFI = Electronic Fuel Injection
EGO = Exhaust Gas Oxygen Sensor
EGR = Exhaust Gas Recirculation
EGRPS = EGR Valve Position Sensor
EGRT = EGR Temperature
EI = Electronic Ignition
EMI = Electromagnetic Interference
EMR = Electronic Module Retard
EOS = Exhaust Oxygen Sensor
EOBD = European Onboard Diagnostics
EPOS = EGR Valve Position Sensor
EPROM = Erasable Programmable Read Only Memory (chip)
ESC = Electronic Spark Control
EST = Electronic Spark Timing
EVAP = Evaporative Emission System
EVP = EGR Valve Position 
F = Fahrenheit
FBC = Feedback Carburetor System
FBCA = Feedback Carburetor Actuator
FCS = Fuel Control Solenoid
FDC = Fuel Deceleration Valve
FI = Fuel Injection
FLS = Fluid Level Sensor
ft.lb. = Foot Pound
FWD = Front-Wheel Drive 
GAL = Gallon
GDI = Gasoline Direct Injection
GEN = Generator
GND = Ground
GPM = Grams Per Mile
GPS = Global Positioning System
GVW = Gross Vehicle Weight 
H20 = Water
HC = Hydrocarbon
HEGO = Heated Exhaust Gas Oxygen Sensor
HEI = High Energy Ignition
Hg = Mercury
HO2S = Heated Oxygen Sensor
hp = Horsepower
HT = High Tension
IAC = Idle Air Control
IAT = Intake Air Temperature
IATS = Intake Air Temperature Sensor
IC = Integrated Circuit
ICM = Ignition Control Module
ICS = Idle Control Solenoid
ID = Inside Diameter
IFI = Indirect Fuel Injection
IGN = Ignition
ISC = Idle Speed Control
ISO = International Standards Organization
ITCS = Ignition Timing Control System
ITS = Idle Tracking Switch
JAS = Jet Air System
kHz = Kilohertz
Km = Kilometres
KOEC = "Key On, Engine Cranking"
KOEO = "Key On, Engine Off"
KOER = "Key On, Engine Running"
kPa = Kilopascals
KS = Knock Sensor
KV = Kilovolts
L = Litres
lb. ft. = Pound Feet
LCD = Liquid Crystal Display
LED = Light Emitting Diode
LHD = Left-Hand Drive
LTFT = Long Term Fuel Trim
LWB = Long Wheel-Base
MAF = Mass Air Flow
MAP = Manifold Absolute Pressure
MAT = Manifold Air Temperature
MCS = Mixture Control Solenoid
MCT = Manifold Charge Temperature
MFI = Multi Port Fuel Injection
MIL = Malfunction Indicator Light
mm = Millimetres
MPFI = Multi Point Fuel Injection
MPG = Miles Per Gallon
MPH = Miles Per Hour
MPI = Multi Port Injection
MPV = Multi-Purpose Vehicle
ms = Millisecond
mV = Millivolts
Nm = Newton Metres
NOX = Oxides of Nitrogen
NVRAM = Nonvolatile Random Access Memory
O2 = Oxygen
O2S = Oxygen Sensor
OBD = Onboard Diagnostics
OBD I = Onboard Diagnostics One
OBD II = Onboard Diagnostics Two
OD = Outside Diameter
OE = Original Equipment
OEM = Original Equipment Manufacturer
OHC = OverHead Camshaft
OHV = OverHead Valve
OS = Oxygen Sensor
P/B = Power Bakes
P/N = Part Number
PA = Pressure Air
PAIR = Pulsed Secondary Air Injection
PAS = Power-Assisted Steering
PCM = Powertrain Control Module
PCV = Positive Crankcase Ventilation
PECV = Power Enrichment Control Valve
PFI = Port Fuel Injection
PID = Parameter ID
PIP = Profile ignition pickup
PNP = Park/Neutral Switch
PPM = Parts Per Million
PROM = Program Read Only Memory (chip)
PS = Power Steering
PSI = Pounds Per Square Inch
PSP = Power Steering Pressure
pt. = Pint
PTC = Pending Trouble Code
PTC = Positive temperature coefficient Additional : This is applied to the way the resistance of a thermistor varies with temperature. In this case, the resistance will increase as the temperature raises
PWR = Power to Weight Ratio
RAM = Random Access Memory
RFI = Radio Frequency Interference
RHD = Right-Hand Drive
ROM = Read Only Memory
RON = Rated Octane Number
RPM = Revolutions Per Minute
RWD = Rear-Wheel Drive
SC = Supercharged
SEFI = Sequential Electronic Fuel Injection
SES = Service Engine Soon (light)
SFI = Sequential Fuel Injection
SIPS = Side Impact Protection System
SOHC = Single Over Head Camshaft
SRS = Secondary Restraint System
SRS = Supplemental Restraint System (air bag)
SRT = System Readiness Test
SS = Speed Sensor
SSI = Solid State Ignition
STFT = Short Term Fuel Trim
SWB = Short Wheel-Base
TACH = Tachometer
TB = Throttle Body
TBI = Throttle Body Injection
TC = Turbocharged
TCC = Torque Converter Clutch
TCM = Transmission or Transaxle Control Module
TCS = Traction control solenoid (SAAB 9000)
TD = Turbo Diesel
TDC = Top Dead Center
TDI = Turbo Direct Injection (A turbo charged direct injected diesel engine)
TIV = Thermactor Idle Vacuum Valve
TKS = Throttle Kicker Solenoid
TPI = Tuned Port Injection
TPP = Throttle Position Potentiometer
TPS = Throttle Position Sensor
TPT = Throttle Position Transducer
TSP = Throttle Solenoid Positioner
TV = Throttle Valve
TVS = Thermal Vacuum Switch
TWC = Three Way Catalyst
TWC+OC = Three Way + Oxidation Catalytic Converter
V V C = Variable Valve Control
V V T = Variable Valve Timing
WOT = Wide Open Throttle