Glossary of Acronyms
ABS Antilock Brake SystemACM Airbag Control Module
AECM Airbag Electrical Control Module also called ACM
AMB/BATT Ambient or Battery Temperature
ASDM Airbag System Control Module also called ACM
Backfire, Popback Fuel ignites in either the intake or the exhaust system.
CCD Chrysler Collision Detection (vehicle communication bus)
CKP Crankshaft Position Sensor
CMP Camshaft Position Sensor
Cuts Out, Misses A steady pulsation or the inability of the engine to maintain a consistent rpm.
DAB Driver Airbag
DLC Data Link Connector (previously called "engine diagnostic connector").
Detonation, Spark Knock A mild to severe ping, especially under loaded engine conditions.
DTC Diagnostic Trouble Code
ECT Engine Coolant Temperature Sensor
EEM Electronic Entry Module
EGR Exhaust Gas Recirculation Valve and System
EMCC Electronic Modulated Converter Clutch
Generator Previously called "alternator".
Hard Start The engine takes longer than usual to start, even though it is able to crank normally.
Hesitation, Sag, Stumble There is a momentary lack of response when the throttle is opened.This can occur at all vehicle speeds. If it is severe enough, the engine may stall.
IAT Intake Air Temperature Sensor
IAC Idle Air Control Valve
JTEC Jeep/Truck Engine Controller
Lack of Power, Sluggish The engine has less than expected power, with little or no increase in vehicle speed when the throttle is opened.
LDP Leak Detection Pump
MAP Manifold Absolute Pressure Sensor
MIL Malfunction Indicator Lamp
MTV Manifold Tuning Valve
O2S Oxygen Sensor
ORVR Onboard Refueling Vapor Recovery
PAB Passenger Airbag
PCI Programable Communications Interface
PCM Powertrain Control Module
[1][2]PCV Positive Crankcase Ventilation
PEP Peripheral Expansion Port
PDC Power Distribution Center
Poor Fuel Economy There is significantly less fuel mileage than other vehicles of the same design and configuration.
Rough, Unstable, or
Erratic Idle, Stalling The engine runs unevenly at idle and causes the engine to shake if it is severe enough. The engine idle rpm may vary (called "hunting"). This condition may cause stalling if it is severe enough.
SQUIB also called Initiator (located in rear of airbag module)
Start & Stall The engine starts but immediately dies.
Surge Engine rpm fluctuation without corresponding change in Throttle Position Sensor.
TPS Throttle Position Sensor
TRS Transmission Range Sensor
VSS Vehicle Speed Sensor/Signal