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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
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
DLC - Data Link
Connector
Driving Cycle - A
specific sequence of start-up, warm-up and driving tasks that tests all OBD II
functions
DTC - Diagnostic Trouble
Code
ECM - Engine Control Module-
usually the main in-car computer controlling emissions and engine
operation
ECT - Engine Coolant
Temperature
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
HC - Hydrocarbons
HEI - High Energy
Ignition
HO2S - Heated
Oxygen Sensor
IAT - Intake Air
Temperature
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
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
WOT - Wide Open Throttle
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