P064C

DTC P064C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptor
DTC P064C
- Glow Plug Module Control Performance

Diagnostic Fault Information





Typical Scan Tool Data





Circuit/System Description

The glow plug control module (GPCM) has the ability to perform internal diagnostics for voltage and output state of the glow plugs. The GPCM will send a message to the engine control module (ECM) to set this DTC.

Conditions for Running the DTC

* The ignition is ON.
* DTC P064C runs continuously.

Conditions for Setting the DTC

The GPCM detects a variation between the main battery supply to the GPCM and battery supply to the ECM, or an internal condition for 3 second.

Action Taken When the DTC Sets

DTC P064C is a Type B DTC.

Conditions for Clearing the DTC

DTC P064C is a Type B DTC.

Reference Information
Schematic Reference

Engine Controls Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions (Diagnostic Trouble Code Descriptions)
Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Verification

1. If you cannot duplicate the conditions, refer to Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics).
2. Engine running, observe the DTC information with a scan tool. DTC P064C should not set.
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition ON, verify the scan tool GPCM Ignition 1 Signal parameter is battery voltage.

• 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 or short to ground. If the circuit tests normal, replace the GPCM.

2. Ignition OFF, disconnect the X2 harness connector at the GPCM.
3. Ignition ON, verify that a test lamp illuminates between the ignition 1 voltage circuit terminal 52 and ground.

• If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the GPCM.

4. Ignition ON, verify that a test lamp illuminates between the ignition 0 voltage circuit terminal 53 and ground.

• If the test lamp does not illuminate, test the ignition 0 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the GPCM.

5. If all circuits test normal, replace the GPCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning)for GPCM replacement, setup, and programming