P0512

DTC P0512

Circuit Description
The starter switch signal is inputted to the engine control module (ECM) during the ignition switch "START" position. The ECM uses the starter switch input for fuel crank mode and starter cut relay control. If the ECM detects the starter switch signal is ON when the engine is running, this DTC will set.

Condition for Running the DTC
- The battery voltage is between 10-16 volts.
- The ignition switch is ON.
- The engine is running.

Condition for Setting the DTC
- The ECM detects that the starter switch signal circuit is ON position (high voltage) for 10 seconds.

Action Taken When the DTC Sets
- The ECM illuminates the malfunction indicator lamp (MIL) 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 Failure Records.

Condition for Clearing the DTC
- A current DTC, Last Test Failed, clears when the diagnostic runs and passes.
- Clear the MIL and the DTC with a scan tool.

Diagnostic Aids
If the engine does not crank normally, refer to the Starting System section.
If an intermittent condition is suspected, the following may cause an intermittent:
- Faulty ignition switch.
- Poor connections.
- Misrouted harness.
- Broken wire inside the insulation.
- Rubbed through wire insulation.

Check for the following conditions:
- Poor connection at ECM: 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 P0512" display on the scan tool with the engine running while moving connectors and wiring harness related to the switch. A change in the display will indicate the location of the fault.

DTC P0512

Schematic Reference: Engine Controls Schematics Starting and Charging Schematics