September 30: LEMON manuals is back up on a temporary server! Slowness is possible
Diagnostic Executive
Diagnostic Executive is the computer program in the
Powertrain Control Module (PCM) coordinating the OBD II self monitoring system. The program controls all the monitors, interactions, Diagnostic Trouble Code
(DTC) and
Malfunction Indicator Lamp (MIL) operation, Freeze Frame Data and scan tool interface.