Powertrain Diagnosis

CIRCUIT DESCRIPTION
The MIL request circuit signals the Powertrain Control Module (ECM) that the Transmission Control Module (TCM) is requesting MIL illumination.

CONDITIONS FOR RUNNING THE DTC
The engine is running.

CONDITIONS FOR SETTING THE DTC
The TCM is requesting MIL illumination, or that the MIL request circuit is shorted to ground.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Use a scan tool in order to clear the MIL and the DTC.

TEST DESCRIPTION

Steps 1-10:

The number below refer to the step number on the diagnostic table.
2. If the TCM has DTCs set that are requesting MIL illumination, those DTCs must be diagnosed first.