For 1990-2009 cars

Abbreviation | Meaning
--- | ---
A
A | Ampere(s)
ABS | Antilock Brake System
A/C | Air Conditioning
AC | Alternating Current
ACC | Accessory, Automatic Climate Control
ACL | Air Cleaner
ACR4 | Air Conditioning Refrigerant, Recovery, Recycling, Recharging
A/D | Analog to Digital
ADL | Automatic Door Lock
A/F | Air/Fuel (Ratio)
AIR | Secondary Air Injection
ALC | Automatic Level Control
AM/FM | Amplitude Modulation/Frequency Modulation
Ant | Antenna
AP | Accelerator Pedal
API | American Petroleum Institute
APP | Accelerator Pedal Position
APT | Adjustable Part Throttle
ARS | Automatic Restraint System
ASR | Acceleration Slip Regulation
A/T | Automatic Transmission/Transaxle
ATC | Automatic Temperature Control
ATDC | After Top Dead Center
Auto | Automatic
AUX | Auxiliary
avg | average
AWD | All Wheel Drive
AWG | American Wire Gage
B
B+ | Battery Positive Voltage
B- | Battery Negative Voltage
BARO | Barometric (pressure)
batt | battery
BBV | Brake Booster Vacuum
BCM | Body Control Module
BHP | Brake Horsepower
BLK | Black
BLU | Blue
BP | Back Pressure
BPM | Brake Pressure Modulator
BPMV | Brake Pressure Modulator Valve
BPP | Brake Pedal Position
BRN | Brown
BTDC | Before Top Dead Center
Btu | British thermal units
C
°C | Degrees Celsius
CAC | Charge Air Cooler
CAFE | Corporate Average Fuel Economy
Cal | Calibration
Cam | Camshaft
CARB | California Air Resources Board
cc | cubic centimeters
CCM | Central Control Module
CCOT | Cycling Clutch Orifice Tube
CCP | Climate Control Panel
CD | Compact Disc
CE | Commutator End
CEAB | Cold Engine Air Bleed
CEMF | Counter Electromotive Force
cfm | cubic feet per minute
cg | center of gravity
CID | Cubic Inch Displacement
CKP | Crankshaft Position
CKT | Circuit
CL | Closed Loop
C/Ltr | Cigar Lighter
CMP | Camshaft Position
CNG | Compressed Natural Gas
CO | Carbon Monoxide
CO2 | Carbon Dioxide
Coax | Coaxial
COMM | Communication
Conn | Connector
CPA | Connector Position Assurance
CPP | Clutch Pedal Position
CPS | Central Power Supply
CPU | Central Processing Unit
CRT | Cathode Ray Tube
CRTC | Cathode Ray Tube Controller
CS | Charging System
CTP | Closed Throttle Position
cu ft | cubic foot/feet
cu in | cubic inch/inches
CV | Constant Velocity (joint)
CVRSS | Continuously Variable Road Sensing Suspension
Cyl | Cylinder(s)
D
DAB | Delayed Accessory Bus
dB | decibels
dBA | decibels on A-weighted scale
DC | Direct Current
DCM | Door Control Module
DE | Drive End
DEC | Digital Electronic Controller
DERM | Diagnostic Energy Reserve Module
DI | Distributor Ignition
dia | diameter
DIC | Driver Information Center
Diff | Differential
DK | Dark
DLC | Data Link Connector
DMM | Digital Multimeter
DOHC | Dual Overhead Camshafts
DR | Driver
DRL | Daytime Running Lamps
DTC | Diagnostic Trouble Code
E
EBCM | Electronic Brake Control Module
EBTCM | Electronic Brake and Traction Control Module
EC | Electrical Center
ECC | Electronic Climate Control
ECI | Extended Compressor at Idle
ECL | Engine Coolant Level
ECM | Engine Control Module
ECS | Emission Control System
ECT | Engine Coolant Temperature
EEPROM | Electronically Erasable Programmable Read Only Memory
EEVIR | Evaporator Equalized Values in Receiver
EFE | Early Fuel Evaporation
EGR | Exhaust Gas Recirculation
EGR TVV | Exhaust Gas Recirculation Thermal Vacuum Valve
EI | Electronic Ignition
ELAP | Elapsed
ELC | Electronic Level Control
E/M | English / Metric
EMF | Electromotive Force
Eng | Engine
EOP | Engine Oil Pressure
EOT | Engine Oil Temperature
EPA | Environmental Protection Agency
EPR | Exhaust Pressure Regulator
EPROM | Erasable Programmable Read Only Memory
ESC | Electronic Suspension Control
ESD | Electrostatic Discharge
ETC | Electronic Throttle Control, Electronic Temperature Control
ETCC | Electronic Touch Climate Control
ETR | Electronically Tuned Receiver
EVAP | Evaporative Emission
EVO | Electronic Variable Orifice
Exh | Exhaust
F
°F | Degrees Fahrenheit
FC | Fan Control
FDC | Fuel Data Center
FED | Federal (all United States except California)
FEDS | Fuel Enable Data Stream
FF | Flexible Fuel
FI | Fuel Injection
FMVSS | Federal Motor Vehicle Safety Standards
F/P | Fuel Pump
ft | foot/feet
FT | Fuel Trim
F4WD | Full Time Four Wheel Drive
4WAL | Four Wheel Antilock
4WD | Four Wheel Drive
FW | Flat Wire
FWD | Front Wheel Drive
G
g | grams, gravitational acceleration
GA | Gage
gal | gallon
gas | gasoline
GCW | Gross Combination Weight
Gen | Generator
GL | Gear Lubricant
GM | General Motors
GM SPO | General Motors Service Parts Operations
gnd | ground
gpm | gallons per minute
GRN | Green
GRY | Gray
GVWR | Gross Vehicle Weight Rating
H
H | Hydrogen
H2O | Water
Harn | Harness
HC | Hydrocarbons
H/CMPR | High Compression
HD | Heavy Duty
HDC | Heavy Duty Cooling
hex | hexagon
Hg | Mercury
Hi Alt | High Altitude
HO2S | Heated Oxygen Sensor
hp | horsepower
HPL | High Pressure Liquid
HPS | High Performance System
HPV | High Pressure Vapor
Htd | Heated
HTR | Heater
HUD | Head-up Display
HVAC | Heater-Vent-Air Conditioning
HVACM | Heater-Vent-Air Conditioning Module
HVM | Heater Vent Module
Hz | Hertz
I
IAC | Idle Air Control
IAT | Intake Air Temperature
IC | Integrated Circuit, Ignition Control
ICM | Ignition Control Module
ID | Identification, Inside Diameter
IDI | Integrated Direct Ignition
ign | ignition
ILC | Idle Load Compensator
in | inch/inches
INJ | Injection
inst | instantaneous
I/P | Instrument Panel
IPC | Instrument Panel Cluster
I/PEC | Instrument Panel Electrical Center
ISC | Idle Speed Control
ISO | International Standards Organization
ISS | Input Speed Shaft
K
KAM | Keep Alive Memory
KDD | Keyboard Display Driver
kg | kilogram
kHz | kilohertz
km | kilometer
km/h | kilometers per hour
km/l | kilometers per liter
kPa | kilopascals
KS | Knock Sensor
kV | kilovolts
L
L | Liter
L4 | Four Cylinder Engine, In-line
L6 | Six Cylinder Engine, In-Line
lb | pound
lb ft | pound feet (torque)
lb in | pound inch (torque)
LCD | Liquid Crystal Display
LDCL | Left Door Closed Locking
LDCM | Left Door Control Module
LED | Light Emitting Diode
LF | Left Front
LH | Left Hand
lm | lumens
LR | Left Rear
lt | left
LT | Light
M
MAF | Mass Air Flow
Man | Manual
MAP | Manifold Absolute Pressure
MAT | Manifold Absolute Temperature
max | maximum
M/C | Mixture Control
MDP | Manifold Differential Pressure
MFI | Multiport Fuel Injection
mi | miles
MIL | Malfunction Indicator Lamp
min | minimum
ml | milliliter
mm | millimeter
mpg | miles per gallon
mph | miles per hour
ms | millisecond
MST | Manifold Surface Temperature
M/T | Manual Transmission/Transaxle
MV | Megavolt
mV | millivolt
N
NAES | North American Export Sales
NC | Normally Closed
NEG | Negative
Neu | Neutral
NLGI | National Lubricating Grease Institute
N·m | Newton-meter (torque)
NO | Normally Open
NOx | Oxides of Nitrogen
NPTC | National Pipe Thread Coarse
NPTF | National Pipe Thread Fine
NVRAM | Non Volatile Random Access Memory
O
O2 | Oxygen
O2S | Oxygen Sensor
OBD II | On-Board Diagnostics II
OC | Oxidation Converter (Catalytic)
OD | Outside Diameter
ODO | Odometer
OE | Original Equipment
OEM | Original Equipment Manufacturer
OHC | Overhead Camshaft
OL | Open Loop
ORN | Orange
OSS | Output Shaft Speed
oz | ounce(s)
P
PAG | Polyalkylene Glycol
PASS | Passenger
PASS-Key® | Personalized Automotive Security System
P/B | Power Brakes
PC | Pressure Control
PCB | Printed Circuit Board
PCM | Powertrain Control Module
PCS | Pressure Control Solenoid
PCV | Positive Crankcase Ventilation
PM | Permanent Magnet (Generator)
P/N | Part Number
PNK | Pink
PNP | Park/Neutral Position
PRNDL | Park, Reverse, Neutral, Drive, Low
POA | Pilot Operated Absolute (Valve)
POS | Positive
POT | Potentiometer (Variable Resistor)
PPL | Purple
ppm | parts per million
PROM | Programmable Read Only Memory
P/S | Power Steering
PSD | Power Sliding Door
PSP | Power Steering Pressure
psi | pounds per square inch
psia | pounds per square inch absolute
psig | pounds per square inch gage
pt | pint
PWM | Pulse Width Modulated
Q
qt | quart(s)
R
R-12 | Refrigerant-12
R-134a | Refrigerant-134a
RAM | Random Access Memory (non permanent memory devise, memory contents are lost when power is removed)
RAP | Retained Accessory Power
RAV | Remote Activation Verification
RCDLR | Remote Control Door Lock Receiver
RDCM | Right Door Control Module
Ref | Reference
Rev | Reverse
RF | Right Front, Radio Frequency
RFA | Remote Function Actuation
RFI | Radio Frequency Interference
RH | Right Hand
RKE | Remote Keyless Entry
Rly | Relay
ROM | Read Only Memory (permanent memory devise, memory contents are retained when power is removed)
RPM | Engine Speed (Revolutions Per Minute)
RPO | Regular Production Option
RR | Right Rear
rt | right
RTD | Real Time Damping
RTV | Room Temperature Vulcanizing (sealer)
RWAL | Rear Wheel Antilock
RWD | Rear Wheel Drive
S
s | second(s)
SAE | Society of Automotive Engineers
SC | Supercharger
SCB | Supercharger Bypass
SCM | Seat Control Module
SDM | Sensing and Diagnostic Module
SEO | Special Equipment Option
SFI | Sequential Multiport Fuel Injection
SI | System International (modern version of metric system)
SIR | Supplemental Inflatable Restraint
SLA | Short/Long Arm (suspension)
sol | solenoid
SO2 | Sulfur Dioxide
SP | Splice Pack
SPO | Service Parts Operations
sq ft | square foot/feet
sq in | square inch/inches
SRC | Service Ride Control
SRI | Service Reminder Indicator
ST | Scan Tool
S4WD | Selectable Four Wheel Drive
Sw | Switch
syn | synchronizer
T
Tach | Tachometer
TBI | Throttle Body Fuel Injection
TC | Turbocharger
TCC | Torque Converter Clutch
TCS | Traction Control System
TDC | Top Dead Center
TEMP | Temperature
Term | Terminal
TFP | Transmission Fluid Pressure
TFT | Transmission Fluid Temperature
TOC | Transmission Oil Cooler
TP | Throttle Position
TPA | Terminal Positive Assurance
TPM | Tire Pressure Monitoring
TR | Transmission Range
TRANS | Transmission/Transaxle
TV | Throttle Valve
TVRS | Television and Radio Suppression
TVV | Thermal Vacuum Valve
TWC | Three Way Converter (Catalytic)
TWC+OC | Three Way + Oxidation Converter (Catalytic)
TXV | Thermal Expansion Valve
U
UART | Universal Asynchronous Receive and Transmit
U/H | Underhood
U/HEC | Underhood Electrical Center
U-joint | Universal Joint
UTD | Universal Theft Deterrent
UV | Ultraviolet
V
V | Volt(s), Voltage
V6 | Six Cylinder Engine, V-Type
V8 | Eight Cylinder Engine, V-Type
Vac | Vacuum
VAC | Vehicle Access Code
VATS | Vehicle Anti-Theft System
VCM | Vehicle Control Module
VDOT | Variable Displacement Orifice Tube
VDV | Vacuum Delay Valve
vel | velocity
VES | Variable Effort Steering
VF | Vacuum Fluorescent
VIO | Violet
VIN | Vehicle Identification Number
VMV | Vacuum Modulator Valve
VR | Voltage Regulator
V ref | Voltage Reference
VSS | Vehicle Speed Sensor
W
w/ | with
W/B | Wheel Base
WHL | Wheel
WHT | White
w/o | without
WOT | Wide Open Throttle
W/P | Water Pump
W/S | Windshield
WSS | Wheel Speed Sensor
WU-OC | Warm Up Oxidation Converter (Catalytic)
WU-TWC | Warm Up Three Way Converter (Catalytic)
X
X-valve | Expansion valve
Y
yd | yard(s)
YEL | Yellow

### Diagnostics Emission Control Terms

The following list contains engine emission control terms and acronyms used by Saturn Corporation. Saturn Service Publications use these terms and acronyms, many of which are similar or identical to former Saturn terms. The list is consistent with he SAE 1930 document. Recommended practice is geared toward standardizing terminology across all automobile manufacturers.

ACRONYM | DESCRIPTION
--- | ---
ACL | Air Cleaner
A/C Pressure Sensor | Air Conditioning Pressure Sensor
AIR | Secondary Air Injection
AIR Pump | Secondary Air Injection Pump
CL | Closed Loop
CKP Sensor | Crankshaft Position Sensor
CMP Sensor | Camshaft Position Sensor
CTP | Closed Throttle Plate
DLC | Data Link Connector
DTC | Diagnostic Trouble Code
ECM | Engine Control Module
ECT Sensor | Engine Coolant Temperature Sensor
EEPROM | Electronically Erasable Programmable Read Only Memory
EGR | Exhaust Gas Recirculation
EI | Electronic Ignition
EOP Switch | Engine Oil Pressure Switch
EPROM | Erasable Read Only Memory
EVAP System | Evaporative Emission Control System
FC Relay | Fan Control Relay
FP | Fuel Pump
HO2S | Heated Oxygen Sensor
IAC Valve | Idle Air Control Valve
IAT Sensor | Intake Air Temperature Sensor
IC (Ignition Control) | Electronic Ignition System
ISS | Input Speed Sensor
KS | Knock Sensor
Long Term FT | Long Term Fuel Trim
MAF Sensor | Mass Air Flow Sensor
MAP Sensor | Manifold Absolute Pressure Sensor
MIL | Malfunction Indicator Lamp
OBD II | On-Board Diagnostics Generation II
OC | Oxidation Catalytic Converter (Pre-Converter)
OL | Open Loop
OSS | Output Speed Sensor
O2S | Oxygen Sensor
PCM | Powertrain Control Module
PCV Valve | Positive Crankcase Ventilation Valve
PWM | Pulse Width Modulation
RAM | Random Access Memory
ROM | Read Only Memory
RPM | Revolutions Per Minute
SFI | Sequential Fuel Injection
Short Term FT | Short Term Fuel Trim
ST Data | Scan Tool Data
TC | Transaxle Control
TCC Solenoid | Torque Converter Clutch Solenoid
TFT Sensor | Transaxle Fluid Temperature Sensor
TP Sensor | Throttle Position Sensor
TWC | Three-Way Catalyst (Main Converter)
TWC + OC | Three-Way + Oxidation Catalytic Converter (Pre and Main Converter)
WOT | Wide Open Throttle