Cruze

DTC P0671, P0672, P0673, or P0674

The glow plug controller is a solid state device which operates the glow plugs. The temperature and the power consumption is controlled between the engine control module (ECM) and the glow plug controller within a wide range to suit the engine pre-heating requirements. The ECM controls the glow plug module with a pulse-width modulated (PWM) control circuit. The glow plug initial ON time will vary based on the system voltage and temperature. Lower temperatures cause longer ON times.

The ECM detects an open or a short to ground on a glow plug control circuit for greater than 6 s.

DTC P0671, P0672, P0673, P0674 are Type C DTCs.

DTC P0671, P0672, P0673, P0674 are Type C DTCs.

Schematic Reference

Engine Controls Schematics : LLW

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

1. Ignition ON, observe the DTC information with a scan tool. DTC P0671, P0672, P0673, or P0674 should not set.
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.

1. Ignition OFF, disconnect the harness connector at the K34 Glow Plug Control Module.
2. Test for 0.5-1.5 Ω between the appropriate glow plug control circuit terminal and ground.

⇒	If less than the specified range, test the control circuit for a short to ground. If the circuit tests normal, replace the appropriate inoperative glow plug.

⇒	If greater than the specified range, test the control circuit for an open/high resistance. If the circuit tests normal, replace the appropriate inoperative glow plug.

3. If all circuits test normal, test or replace the K34 Glow Plug Control Module.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.