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OBD2 Terminology

The following terms and their definitions are related to OBD2 systems.
  • Powertrain Control Module (PCM) - The PCM is the OBD2 accepted term for the vehicle's "on-board computer." In addition to controlling the engine management and emissions systems, the PCM also participates in controlling the powertrain (transmission) operation. Most PCMs also have the ability to communicate with other computers on the vehicle (ABS, ride control, body, etc.).

  • Monitor - Monitors are "diagnostic routines" programmed into the PCM. The PCM utilizes these programs to run diagnostic tests, and to monitor operation of the vehicle's emissions-related components or systems to ensure they are operating correctly and within the vehicle's manufacturer specifications. Currently, up to eleven Monitors are used in OBD2 systems. Additional Monitors will be added as the OBD2 system is further developed. Not all vehicles support all eleven Monitors.

  • Enabling Criteria - Each Monitor is designed to test and monitor the operation of a specific part of the vehicle's emissions system (EGR system, oxygen sensor, catalytic converter, etc.). A specific set of "conditions" or "driving procedures" must be met before the computer can command a Monitor to run tests on its related system. These "conditions" are known as "Enabling Criteria." The requirements and procedures vary for each Monitor. Some Monitors only require the ignition key to be turned "On" for them to run and complete their diagnostic testing. Others may require a set of complex procedures, such as, starting the vehicle when cold, bringing it to operating temperature, and driving the vehicle under specific conditions before the Monitor can run and complete its diagnostic testing.

  • Monitor Has/Has Not Run - The terms "Monitor has run" or "Monitor has not run" are used throughout this manual. "Monitor has run," means the PCM has commanded a particular Monitor to perform the required diagnostic testing on a system to ensure the system is operating correctly (within factory specifications). The term "Monitor has not run" means the PCM has not yet commanded a particular Monitor to perform diagnostic testing on its associated part of the emissions system.

  • Trip - A Trip for a particular Monitor requires that the vehicle is being driven in such a way that all the required "Enabling Criteria" for the Monitor to run and complete its diagnostic testing are met. The "Trip Drive Cycle" for a particular Monitor begins when the ignition key is turned "On." It is successfully completed when all the "Enabling Criteria" for the Monitor to run and complete its diagnostic testing are met by the time the ignition key is turned "Off." Since each of the eleven monitors is designed to run diagnostics and testing on a different part of the engine or emissions system, the "Trip Drive Cycle" needed for each individual Monitor to run and complete varies.

  • OBD2 Drive Cycle - An OBD2 Drive Cycle is an extended set of driving procedures that takes into consideration the various types of driving conditions encountered in real life. These conditions may include starting the vehicle when it is cold, driving the vehicle at a steady speed (cruising), accelerating, etc. An OBD2 Drive Cycle begins when the ignition key is turned "On" (when cold) and ends when the vehicle has been driven in such a way as to have all the "Enabling Criteria" met for all its applicable Monitors. Only those trips that provide the Enabling Criteria for all Monitors applicable to the vehicle to run and complete their individual diagnostic tests qualify as an OBD2 Drive Cycle. OBD2 Drive Cycle requirements vary from one model of vehicle to another. Vehicle manufacturers set these procedures. Consult your vehicle's service manual for OBD2 Drive Cycle procedures. Do not confuse a "Trip" Drive Cycle with an OBD2 Drive Cycle. A "Trip" Drive Cycle provides the "Enabling Criteria" for one specific Monitor to run and complete its diagnostic testing. An OBD2 Drive Cycle must meet the "Enabling Criteria" for all Monitors on a particular vehicle to run and complete their diagnostic testing.

  • Warm-up Cycle - Vehicle operation after an engine off period where engine temperature rises at least 40░F (22░C) from its temperature before starting, and reaches at least 160░F (70░C). The PCM uses warm-up cycles as a counter to automatically erase a specific code and related data from its memory. When no faults related to the original problem are detected within a specified number of warm-up cycles, the code is erased automatically.

The following terms and their definitions are related to OBD 1 systems.

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

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 Center

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 - 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

CANP - EVAP Canister Purge Solenoid

CARB - Carburetor

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 Centimeters

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 Center

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 - 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)

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 Carburetor

FBCA - Feedback Carburetor Actuator (Ford)

FC - Fan Control

FCA - Fuel Control Assembly (Chrysler)

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

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

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 - 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

L - Liters

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 - Microprocessed Sensing and Automatic Regulation (GM)

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 - Powertrain 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 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)

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 - 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

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 - 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

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 - Underdrive

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 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

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