Extinguishing the MIL

The powertrain control module (PCM) will turn Off the malfunction indicator lamp (MIL) after three consecutive trips that a test passed has been reported for the diagnostic test that originally caused the MIL to illuminate.

The diagnostic trouble code (DTC) will remain in the PCM memory and the Freeze Frame record until forty (40) warm-up cycles have been completed and no faults exist.

An MIL that was illuminated by either a fuel-trim DTC or a misfire-related DTC has additional requirements that must be met in order to turn Off the MIL. The additional requirements are as follows:
^ The diagnostic tests that are passed must occur within 375 RPM of the RPM data stored at the time the last test failed.
^ The diagnostic tests that are passed must occur within ten percent of the engine load that was stored at the time the last test failed.
^ The diagnostic tests that are passed must occur at engine temperature conditions (warmed up or warming up) that are similar to those stored at the time the last test failed.

Meeting these requirements ensures that the fault which turned on the MIL has been corrected.