Malfunction Indicator Lamp (MIL) Always On
Engine Control Schematics: MIL And Generator:
CIRCUIT DESCRIPTION
When the ignition is turned ON, the Malfunction Indicator Lamp (MIL) will momentarily flash ON then OFF and remain ON until the engine is running, if no Diagnostic Trouble Codes (DTCs) are stored. The Powertrain Control Module (PCM) controls the MIL by providing a ground path through the MIL control circuit to turn ON the MIL
Diagnostic Chart:
TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table:
2. This step tests the ability of the PCM to control the MIL. The scan tool has the ability to command the MIL ON and OFF.
6. The replacement PCM must be programmed and the Crankshaft Position System Variation Learn procedure must be performed.