Diagnostic Instructions
DTC Descriptors
DTC P064C: Glow Plug Control Module Performance
Circuit/System Description
This DTC applies to internal microprocessor integrity conditions within the glow plug control module.
Conditions for Running the DTC
• | The battery voltage is between 9-16 volts. |
• | The DTC runs once per ignition cycle when the above condition is met. |
Conditions for Setting the DTC
The ECM detects a glow plug control module malfunction.
Action Taken When the DTC Sets
DTC P064C is a Type C DTC.
Conditions for Clearing the DTC
DTC P064C is a Type C DTC.
Reference Information
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition On, observe the DTC information with a scan tool. DTC P064C should not set.
- 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
- Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the glow plug control module.
- Test for less than 5 ohms of resistance between the ground circuit terminal 7 and ground.
⇒ | If greater than the specified range, repair the ground circuit for an open/high resistance. |
- Test for greater than 1 ohm of resistance between each of the glow plug circuit terminals and ground.
• | Glow Plug 1 circuit terminal 4 |
• | Glow Plug 2 circuit terminal 3 |
• | Glow Plug 3 circuit terminal 2 |
• | Glow Plug 4 circuit terminal 1 |
⇒ | If less than the specified range, repair the glow plug circuit for a short to ground. |
- Install the MAIN fuse. Ignition ON, verify a test lamp illuminates between the ignition 1 voltage circuit terminal 6 and ground.
⇒ | If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance. |
- If all circuits test normal, replace the glow plug control module.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.