Glossary of Automotive Acronyms
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 – Analog to Digital Converter
A/F – Air Fuel Ratio
A/T – Automatic Transmission
A4R70W – Automatic Overdrive Electronic Wide Ration Transmission
AAC – Auxiliary Air Control Valve
AAT – Ambient Air Temperature
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 – Automatic Climate Control
ACC – Air Conditioning Clutch
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
APCM – Auxiliary Powertrain Control Module
API – Application Programming Interface
APS – Absolute Pressure Sensor (GM)
APS – Atmospheric Pressure Sensor (Mazda)
APT – Adjustable part Throttle
ARC – Automatic Ride Control
ARS – Automatic Restraint System
ASARC – Air Suspension Automatic Ride Control
ASCII – American Standard for Character Information Interchange
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 Center
ATF – Automatic Transmission Fluid
ATM – Actuator Test Mode
ATP – Automotive Telemetry Protocol
ATS – Air Temperature Sensor (Chrysler)
ATX – Automatic Transaxle
AVOM – Analog Volt / Ohm Meter
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
BEV – Barrier Equivalent Velocity (crash testing)
BHP – Brake Horsepower
BHS – Bimetal Heat Sensor (Ford)
BID – Breakerless 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
CAI – Controlled Auto Ignition
CAN – Controller Area Network
CANP – EVAP Canister Purge Solenoid
CARB – Carburetor
CAS – Crank Angle Sensor
CAS – Clean Air System
CAS – Creep Aid System (automatic transmissions)
CASE – Cranking Angle Sensing Error
CBD – Closed Bowl Distributor
CC – Catalytic Converter
CC – Climate Control
CC – Cruise Control
CC – Cubic Centimeters
CCC – Computer Command Control System (GM)
CCC – Converter Clutch Control
CCD – Computer Controlled Dwell
CCD – Chrysler Collision Detection
CCDIC – Climate Control Driver Information Center
CCEI – Coolant Controlled Idle Enrichment (Chrysler)
CCEV – Coolant Controlled Engine Vacuum Switch (Chrysler)
CCM – Continuous Component Monitor
CCM – Central Control Module
CCM – Comprehensive Component Monitor
CCNT, DTC CCNT – Count Code
CCO – Converter Clutch Override
CCOT – Cycling Clutch Orifice Tube
CCP – Controlled Canister Purge (GM)
CCP – Climate Control Panel
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 – Commutator 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)
COLPAS – Column-Integrated Power-Assisted Steering
COP – Coil On Plug Electronic Ignition
CP – Crankshaft Position Sensor (Ford)
CP – Canister Purge (GM)
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
CRC – Cyclic Redundancy Check
CRK – Cranking Signal
CRS – Common Rail System
CRT – Cathode Ray Tube
CSC – Coolant Spark Control (Ford)
CSE GND – PCM Case Ground
CSF – Crankshaft Speed Fluctuation Sensor
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 – Control Valve
CV – Constant Velocity
CVCC – Compound Vortex Controlled Combustion System (Honda)
CVD – Cylinder Valve Deactivation
CVR – Control Vacuum Regulator (Ford)
CVS – Constant Volume Sampler
CVTC – Continuous Valve Timing Control
CVTS – Continuous Variable Tumble System (engine combustion)
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
DDD – Dynamic Data Display
DDL – Diagnostic Data Link
DDL – Diagnostic Information Base
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 – Distributor Ignition (System)
DI – Direct Ignition
DIB – Diagnostic Information Base
DIC – Driver Information Center
DICM – Distributor Ignition Control Module
DIS – Direct Ignition (Waste Spark)
DITDES – Desired Dynamic Injection Timing
DLC – Data Link Connector (OBD)
DLL – Dynamic Link Library
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
DREAMS – Digital Room Enlargement Automotive Sound
DRFS – Demand-Regulated Fuel Supply
DRL – Daytime Running Lights
DSBP – Driver Seat Belt Pretensioner
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
ECO – Electronically Controlled Orifice (power steering)
ECS – Evaporation Control System (Chrysler)
ECS – Emission Control System
ECT – Engine Coolant Temperature
ECU – Electronic Control Unit
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 Feedback Carburetor (Chrysler)
EFC – Electronic Fuel Control
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
EMVT – Electro-Mechanical Valve Train
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)
EPR – Exhaust Pressure Regulator Valve
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)
ESS – Engine Start-Stop
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
EZEE – Equal to Zero Emissions Engine
F4WD – Full Time Four Wheel Drive
FAN – Cooling Fan (Low or High Speed)
FBC – Feedback Carburetor
FBCA – Feedback Carburetor Actuator (Ford)
FC – Fan Control
FCA – Fuel Control Assembly (Chrysler)
FCM – Fan Control Module
FCS – Fuel Control Solenoid (Ford)
FDBK – Feedback
FDC – Fuel Deceleration Valve (Ford)
FDV – Fuel Decel Valve (Ford)
FEEPROM – Flash Electronically Erasable Programmable Read Only Memory
FEPROM – Flash Erasable Programmable Read Only Memory
FF – Flexible Fuel
FFFP – Fuel-Flexible Fuel Processor
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 Center
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 Cutoff
HPL – High Pressure Liquid
HPS – High Performance System
HPV – High Pressure Vapor
HSC – High Swirl Combustion
HSV – Hill Start Valve (mechanical clutch)
HT – High Tension
HUB – Hub Unit Bearing
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
IBS – Intelligent Brake System
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 – Injector Driver Module
IDM – Ignition Diagnostic Monitor
IFI – Indirect Fuel Injection
IFR – In-Frame Response
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)
IOCTL – Input / Output Control
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
ISS – Instant Start System (diesel engine)
ITA – Ignition Timing Adjustment
ITCS – Ignition Timing Control System (Honda)
ITS – Idle Tracking Switch
IVPWR – EEC-Measured Battery Voltage
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 – Kickdown
KDLH – Kickdown Low Hold
Kg/cm2 – Kilograms/ Cubic Centimeters
kHz – Kilohertz
Km – Kilometers
KOEC – Key On, Engine Cranking
KOEO – Key On, Engine Off
KOER – Key On, Engine Running
KPA – Kilopascal
KS – Knock Sensor
KSM – Knock Sensor Module
KWP – Keyword Protocol
L – Liters
L4 – Four Cylinder Inline Engine
LAMBSE – Short Term Fuel Trim
LCD – Liquid Crystal Display
LDP – Leak Detection Pump
LDVSP – Light-Duty Vehicle Surveillance Program
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
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)
MDB – Moving Deformable Barrier (crash testing)
MDP – Manifold Differential Pressure
MECS – Mazda Electronic Control System
MEMCAL – Memory Calibration
MFDES – Desired Mass of Fuel as Determined by the EEC Strategy
MFI – Multiport Fuel Injection
MGP – Manifold Gauge Pressure = MAP – BP
MIC – Mechanical Instrument Cluster
MICE – Multimedia Information Communications and Entertainment
MIL – Malfunction Indicator Lamp
MISAR – Microprocessed Sensing and Automatic Regulation (GM)
MLP – Manual Lever Position
MLP – Manual Lever Position (sensor)
MLS – Multi-Layer Steel
MLUS – Modulated Lock Up Solenoid or its Control Circuit (Ford)
MLVLPS – Manual Valve Lever Position
MODE – Engine Operation Mode, 0 = No Start, 1 = Crank, 2 = Run
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
MSIG – Multiple Spark-Ignition Gasket
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
NCAPS – Non-Contact Angular Position Sensor
NCRPS – Non-Contact Rotary Position Sensor
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
OBEM – On-Board Emissions Measurement
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
OEM – Original Equipment Manufacturer
OHC – Overhead Cam Engine
OHV – Over Head Valve
OL – Open Loop
OLM – Oil Life Monitor
ORC – Oxidation Reduction Converter
OS – Oxygen Sensor
OSAC – Orifice Spark Advance Control (Chrysler)
OSC – Output State Check (Ford)
OSI – Open System Interconnect
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
PASE – Passive Start and Entry (security system)
PASS – Personalized Automotive Security System
PC – Personal Computer
PC – Pressure Control
PCB – Printed Circuit Board
PCI – Programmable Communications Interface
PCM – Powertrain Control Module
PCO – Pressure Controlled Orifice (power steering)
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 – Accelerator Pedal Position Sensor
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 (switch)
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
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
RBS – Regenerative Braking system
RECAL – Calibration Adjustment
REDOX – Reduction Oxidation Converter
REF – Reference
RFCSS – Rear-Facing Child Safety Seat
RFI – Radio Frequency Interference
RHD – Right Hand Drive
RKE – Remote Keyless Entry
RM – Relay Module
ROM – Read Only Memory
RON – Rated Octane Number
RPC – Remote Parameter Test
RPM – Revolutions Per Minute
RPT – Reference Performance Test
RRS – Variable Reluctance Sensor
RTD – Real Time Dampening
RTN – Dedicated Sensor Ground Circuit
RTV – Room Temperature Vulcanizing
RVP – Reid Vapor 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)
SCARES – Selective Car Audio Receptive Evaluation System
SCB – Supercharger Bypass
SCC – Spark Control Computer (Chrysler)
SCF – Steering Characteristic Function
SCI – Serial Communications Interface
SCP – Standard Corporate Protocol
SCP – Standard Corporate Protocol
SDI – Saab Direct Ignition
SDM – Sensing Diagnostic Module
SDV – Spark Deceleration Valve
SDV – Spark Delay 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 – Sulfur 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
SPS – Service Programming System
SRC – Selective Ride Control
SRDV – Spark Retard Delay Valve
SRI – Service Reminder Indicator
SRR – Short-Range Radar
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
STFT – Short-Term Fuel Trim
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 – Thermactor Air Bypass
TAC – Throttle Actuator Control
TAC – Thermostatic Air Cleaner (GM)
TACH – Tachometer
TAD – Thermactor 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
TCI – Turbocharger and Intercooler
TCIL – Transmission Control Indicator Lamp
TCM – Transmission Control Module
TCP – Temperature Compensated Accelerator Pump (Ford)
TCP – Torque Charger
TCS – Transmission Controlled Spark (GM)
TCS – Traction Control Switch
TCS – Transmission Control Switch
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)
TIR – Total Internal Reflector (headlights)
TIS – Toyota Information System
TIV – Thermactor Idle Vacuum Valve (Ford)
TK – Throttle Kicker Actuator (Ford)
TKS – Throttle Kicker Solenoid
TLA – Three-Layer Acronym
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 – Turbine Speed Shaft Sensor
TSS – Transmission Shaft Speed 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 – Underdrive
UHEGO – Universal Heated Exhaust Gas Oxygen-Sensor
UIDI – Up-Integrated Direct Ignition
USB – Universal Serial Bus
V – Volts
VAC – Vacuum
VAF – Volume Air Flow
VAF – Vane Airflow Meter
VAT – Vane Air Temperature Sensor
VATS – Vehicle AntiTheft System
VBAT – Vehicle (system) Battery Voltage
VCC – Vacuum Cut Control Solenoid
VCI – Vehicle Calibration Identification
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
VFDES – Desired Volume of Fuel as Determined by the EEC Strategy
VIM – Vehicle Interface Module
VIN – Vehicle Identification Number
VIPER – Vehicle Initial Performance Evaluation Register
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)
VPW – Variable Pulse Width
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)
VVTS – Variable Valve Timing Sensor
VVV – Vacuum Vent Valve (Ford)
W/B – Wheelbase
WAC – WOT A/C Cutout Relay
WACA – A/C WOT Cutout 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
YRS – Yaw Rate Sensor
