Dragging Clutch - Failure of friction disc to fully disengage from flywheel, even though clutch pedal is depressed.

Engine Off Self-Test - Test conducted with engine off but ignition key on to cause displaying of trouble codes.

Journal Taper - Difference in diameter of a crankshaft journal from one side to the other.

Pickup Coil Air Gap - Space between the pickup coil and trigger wheel tooth.

PROM Carrier - A plastic case used to protect a PROM making installation easier.