|
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癋 (22癈) from its temperature before starting, and reaches at least 160癋 (70癈). 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
|