Powertrain Control Module (PCM)

Diagnostic Chart:

Type A codes are emission related faults that will turn on the MIL at the first occurrence of a fail condition.

Type B codes are emission related faults that turn on the MIL if it occurs in two consecutive ignition cycles.

Type C codes are non-emission faults that will cause the SERVICE amp to be illuminated. If a test passes after a fault is detected the Service lamp will turn off after about 3 seconds but the fault remains stored in history and a malfunction history record stored.

Type D codes are used to detect non-emission faults, and aid in diagnosis but do not turn on any lamps.