P064C

DTC P064C

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P064C

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Glow Plug Module Control Performance

Circuit/System Description

The glow plug control module has the ability to perform internal self-test diagnostics. If the glow plug control module detects a failure in any of the internal self-tests it 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 glow plug control module detects a fault in one or more of the internal self-test diagnostics.

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.

Diagnostic Aids

* Intermittent or poor connection of the glow plug control module X2 connector may cause this DTC to set.

* Poor glow plug control module ground may cause this DTC to set.

Reference Information

Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

Glow Plug System Description Glow Plug System Description

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. If you cannot duplicate the conditions, refer to Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections.

2. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the K34 glow plug control module.

2. Ignition ON, verify that a test lamp illuminates between the Run/Crank Ignition 1 Voltage circuit terminal 33 and ground.

• If the test lamp does not illuminate repair the open or high resistance in the Run/Crank Ignition 1 Voltage circuit.

3. Verify that a test lamp illuminates between the Run/Crank Ignition 1 Voltage circuit terminal 33 and the Signal Ground circuit terminal 10

• If the test lamp does not illuminate repair the open or high resistance in the Signal Ground circuit.

• If the test lamp illuminates, replace the K34 glow plug control module.

Repair Instructions

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

Control Module References Control Module References for glow plug control module replacement, setup, and programming