P0802

DTC P0802

CIRCUIT DESCRIPTION
The transmission control module (TCM) requests to illuminate the malfunction indicator lamp (MIL) through the request circuit to the engine control module (ECM) when the TCM sets a MIL request DTC(s). If the ECM detects the MIL request circuit is open or the voltage level high when MIL illumination is commanded ON by the TCM, this DTC will set.

This DTC will only run once per ignition cycle within the enabling condition.

Condition for Running the DTC
- The ignition switch is ON.

Condition for Setting the DTC
- The ECM detects that the MIL request circuit is open or the voltage level is high for longer than 2 seconds when MIL illumination is commanded ON by the TCM.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) on the second consecutive driving cycle when the diagnostic runs and fails.
- The ECM records the operating conditions at the time the diagnostic fails. The ECM stores this information in the Freeze Frame/Failure Records on the second consecutive driving cycle when the diagnostic runs and fails.

Condition for Clearing the MIL/DTC
- The ECM turns OFF the MIL after 3 consecutive driving cycles when 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 after the ECM turns OFF the MIL.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
If an intermittent condition is suspected, the following may cause an intermittent:
- Poor connections
- Misrouted harness
- Rubbed through wire insulation
- Broken wire inside the insulation

Check for the following conditions:
- Poor connection at the ECM and TCM: Inspect harness connectors for backed-out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.

Damaged harness: Inspect the wiring harness for damage. If the harness appears to be OK, observe the "DTC P0802 Last Test" display on the scan tool with engine running while moving connectors and wiring harness. A change in the display will indicate the location of the fault.

DTC P0802
Schematic Reference: Engine Controls Schematics
Connector End View Reference: Engine Controls Connector End Views or Engine Control Module (ECM) Connector End Views

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