Common tech Abbreviations and Acronyms
 

Here is a start on untangling these codes. If you run across acronyms or jargon you don't understand, send them in.

AFC - Air Flow Control
ALDL - Assembly Line Diagnostic Link. Former name for GM (only) Data Link Connector, the connector socket into which the scan tool plug is inserted; sometimes used to refer to any pre-OBD II computer signals
ASE- Automotive Service Excellence. To become fully ASE certified, there are 12 areas of expertise a mechanic is tested on.
BCM- Body Control Module (systematic controls lighting(DRL/AHL), climate controls, radio, automatic intermittent wipers, etc)
CAN - Controller Area Network
CARB - California Air Resources Board
CFI - Central Fuel Injection (a.k.a. Throttle Body Fuel Injection TBI)
CFI - Continuous Fuel Injection
CO - Carbon Monoxide
CPS-crank position sensor
DLC - Data Link Connector
Driving Cycle - A specific sequence of start-up, warm-up and driving tasks that tests all OBD II functions (Details)
DTC - Diagnostic Trouble Code
ECM - Engine Control Module- usually the main in-car computer controlling emissions and engine operation
ECT - Engine Coolant Temperature
ECU- Engine Control Unit- same as ECM, but usually called ECU in imports.
EEC - Electronic Engine Control
EEPROM or E2PROM - Electrically Erasable Programmable Read Only Memory
EFI - Electronic Fuel Injection
EGR - Exhaust Gas Recirculation
EMR - Electronic Module Retard
EPA - Environmental Protection Agency. Federal agency. Office of Mobile Sources is the branch concerned with auto emissions.
ESC - Electronic Spark Control
EST - Electronic Spark Timing
DPFE - Differential Pressure Feedback EGR sensor ( On Ford OBDII systems).
DTC - Diagnostic Trouble Code
FLI - Fuel Level Indicator
Fuel Trim - Engine computer function that keeps the air/fuel mixture as close to the ideal 14.7:1 stoichiometric ratio as possible
HC - Hydrocarbons
HEI - High Energy Ignition
HO2S - Heated Oxygen Sensor
IAC- Idle Air Control
IAT - Intake Air Temperature
ICM- Ignition control module
ISO 9141 - International Standards Organization OBDII communication mode, used by Chrysler and most foreign cars. One of three hardware layers defined by OBD II
J1850PWM - (Pulse Width Modulated) SAE-established OBD II communication standard used by Ford domestic cars and light trucks. One of three hardware layers defined by OBD II
J1850VPW - (Variable Pulse Width Modulated) SAE-established OBD II communication standard used by GM cars and light trucks. One of three hardware layers defined by OBD II
J1962 - SAE-established standard for the connector plug layout used for all OBD II scan tools
J1978 - SAE-established standard for OBD II scan tools
J1979 - SAE-established standard for diagnostic test modes
J2012 - SAE-established standard accepted by EPA as the standard test report language for emission tests
MAF - Mass Air Flow
MAP - Manifold Absolute Pressure
MAT - Manifold Air Temperature
MFG - Manufacturer
MIL - Malfunction Indicator Light. The "Check Engine Light" on your dash.
NOx - Oxides of Nitrogen
O2 - Oxygen
OBD - On-Board Diagnostics
OBDII or OBD II - Updated On-Board Diagnostics standard effective in cars sold in the US after 1-1-96
Parameters - Readings on scan tools representing functions measured by OBD II and proprietary readings
PCM - Powertrain Control Module, the on-board computer that controls engine and drive train
PCV - Positive Crankcase Ventilation
PID - Parameter ID
Proprietary Readings - Parameters shown by on-board computers which are not required by OBD II, but included by manufacturer to assist in trouble-shooting specific vehicles.
PTC - Pending Trouble Code
RPM - Revolutions Per Minute
SAE - Society of Automotive Engineers, professional organization that set the standards that EPA adopted for OBD and OBD II
Scan Tool - Computer based read-out equipment to display OBD II parameters
SES - Service Engine Soon dash light, now referred to as MIL
SFI - Sequential Fuel Injection
Stoichiometric ( Stoy'-kee-o-metric) Ratio - Theoretical perfect combustion ratio of 1 part gas to 14.7 parts air
TBI - Throttle Body Injection
TPI - Tuned Port Injection
TPS - Throttle Position Sensor
TPMS- Tire Pressure Monitoring System
TV- as in Trottle valve
VAC - Vacuum
VCM - Vehicle Control Module, the in-car computer that oversees engine management, transmission operation, anti-lock brakes, and other functions not directly related to emissions control
VIN - Vehicle Identification Number
VSS - Vehicle Speed Sensor
WMS= wheel mounting surface.
WOT - Wide Open Throttle
700R4/4L60- are basically the same thing.
4L60E is an electronically controlled 700R4/4L60.
4x4x4=4wheels x 4driven wheels x 4 doors
4x2x2=4wheels x 2driven wheels x 2 doors
4x2x4
4x4x2
4.3/700R4/207= example of: Engine size/ transmission/ transfer case

RE: Common tech Abbreviations and Acronyms
 

MPFI stands for multi port fuel injection

general discussion
 

Hi,
Well this is very important in student life or in professional life that learn lot of abbreviation for writing short forms for understanding.

CKP- Crank position sensor
CMP- Cam position sensor
EBCM- Electronic brake control module

Wow,,,,,,,,,, Great collection of Chevrolet Car`s, but if there is pic present with model name then its might me too great for visitor ...

Thank you very much. This is great info for the Abbreviations and Acronyms.


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Arctic Cat Atvs | Chevrolet Trucks For Sale

I am a mechanical engineering student.Hope that your list will be very helpful to me.

sorry if im doing this wrong but just purchased a 2007 Silv. LTZ. The dealer told me it is normal to hear a ejecting noise or spining noise from the Navigatin DVD if it is in. Could someone please tell me if this is true and if so is there a way to get it to stop..thanks for any help

roblcopeland99, I would like to escalate this question to our Techincal Assistance team. What I need to do is is for you to direct message me your name and VIN. Hopefully I will get an answer back for you.

Jeff Morris, Chevrolet Customer Service

well this is very important for anyone to know thanks for the info.