P064C

DTC P064C

DTC DESCRIPTOR

DTC P064C
Glow Plug Module Control Performance

DIAGNOSTIC FAULT INFORMATION






IMPORTANT: Always perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

TYPICAL SCAN TOOL DATA

Ignition 1 Signal:

CIRCUIT/SYSTEM DESCRIPTION
The glow plug controller has the ability to perform internal diagnostics for voltage and output state of the glow plugs. If the glow plug controller senses an open in the main battery supply to the glow plug controller, or a condition with any of the glow plug driver circuits, the glow plug controller will send an error message to the engine control module (ECM).

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- DTC P064C runs continuously.

CONDITIONS FOR SETTING THE DTC
The glow plug controller detects an open to the main battery supply for the glow plugs, or an open in all 8 glow plug circuits for less than 1 second.

ACTION TAKEN WHEN THE DTC SETS
- The control module illuminates the malfunction indicator lamp (MIL) on the second consecutive ignition cycle that the diagnostic runs and fails.
- The control module records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the control module stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the control module records the operating conditions at the time of the failure. The control module writes the operating conditions to the Freeze Frame and updates the Failure Records.

CONDITIONS FOR CLEARING THE DTC
- The control module turns OFF the 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.
- Clear the MIL and the DTC with a scan tool.

CIRCUIT/SYSTEM VERIFICATION
If you cannot duplicate the conditions refer to Testing for Intermittent Conditions and Poor Connections.

CIRCUIT/SYSTEM TESTING
Monitor the GPCM Data Display ignition 1 signal parameter for battery voltage with a scan tool.
- If the ignition 1 signal parameter is not battery voltage, test the battery positive voltage circuit to the glow plug control module for an open , short to ground or for a faulty glow plug control module.
- If the ignition 1 signal parameter is battery voltage, replace the glow plug control module.

REPAIR INSTRUCTIONS

IMPORTANT: Always perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for ECM replacement, setup, and programming.