Glossary of Acronyms

ABS Antilock Brake System

ACM Airbag Control Module

AECM Airbag Electronic Control Module (ACM)

ASDM Airbag System Diagnostic Module (ACM)

Backfire/Popback Fuel ignites in either the intake or the exhaust system.

CAB Controller Antilock Brake

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

EGR Exhaust Gas Recirculation Valve and System

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.

IAC Idle Air Control Valve

IAT Intake Air Temperature Sensor

JTEC Jeep/Truck Engine Controller (combined engine and transmission control module)

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

LSIACM Left Side Impact Airbag Control Module

MAP Manifold Absolute Pressure Sensor

MIC Mechanical Instrument Cluster

MIL Malfunction Indicator Lamp

MTV Manifold Tuning Valve

O2S Oxygen Sensor

PAB Passenger Airbag

PCI Programable Communications Interface (vehicle communication bus)

PCM Powertrain Control Module

PCV Positive Crankcase Ventilation

PDC Power Distribution Center

PEP Peripheral Expansion Port

Poor Fuel Economy There is significantly less fuel mileage than other vehicles of the same design and configuration.

PWM Pulse Width Modulated

RKE Remote Keyless Entry

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.

RSIACM Right Side Impact Airbag Control Module

SAB Side Airbag

SBEC Single Board Engine Controller

SIACM Side Impact Airbag Control Module

SKIM Sentry Key Immobilizer Module

SKIS Sentry Key Immobilizer System

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.

TCM Transmission Control Module

TPS Throttle Position Sensor

TRS Transmission Range Sensor

VFD Vacuum Fluorescent Display

VSS Vehicle Speed Sensor/Signal

VTSS Vehicle Theft Security System