P064C

DTC P064C Glow Plug Control Module Performance

Circuit Description

The glow control system is operated when the engine coolant temperature is low which allows easier engine starting. If the ignition switch is turned ON when the engine coolant temperature is low the ECM illuminates the glow indicator lamp and turns ON the glow plugs via the glow plug control module (GPCM). After a fixed time passes the ECM turns OFF the glow indicator lamp and the glow plugs via the GPCM. The GPCM has the ability to perform internal diagnostics for voltage and the output state of the glow plugs. If the GPCM detects an open in the voltage feed circuit to the glow plugs or a GPCM system voltage error the GPCM will send a message to the ECM via the controller area network (CAN) communication bus and sets this DTC.

Condition for Running the DTC

^ DTCs U0073 and U0106 are not set.
^ The battery voltage is between 10 to 16 volts.
^ The ignition switch is ON.

Condition for Setting the DTC

Either one of the following condition is met:
^ The GPCM detects system voltage is too low.
^ The GPCM detects an open in all cylinder's glow plug circuits.
^ The ECM received an error messages from the GPCM.

Action Taken When the DTC Sets

^ The ECM illuminates the MIL on the second consecutive driving cycle when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type B.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the MIL/DTC - Type B.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.
^ A charging system problem may set this DTC.

Circuit/System Testing DTC P064C