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DTC C0403

DTC C0403

Diagnostic Instructions


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

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

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


DTC Descriptor

DTC C0403 62

AWD Oil Filter Reverse Valve Stuck Open

Circuit/System Description

The differential clutch pump delivers hydraulic oil pressure to the torque transfer device solenoid valve and the limited slip differential clutch solenoid valve. The pump is mounted to the torque transfer device housing. The pressure of the system is calculated by the rear differential clutch control module which monitors the differential clutch pump current levels. When the pressure reaches approximately 3200 kPa (464 psi), the rear differential clutch control module determines that the system pressure has been obtained and deacvitates the differential clutch pump. If a voltage is detected after a predetermined time limit when the pump has been deactivated an error is detected. This condition indicates the pump is spinning backwards.

Conditions for Running the DTC


• The ignition is ON.

• Operating temperature range 0-80°C (0-176°F).


Conditions for Setting the DTC

The rear differential clutch control module detects voltage on the differential clutch pump control circuit 20 seconds after the pump has been deactivated indicating the pump is spinning in reverse direction.

Action Taken When the DTC Sets

One or more of the following actions may occur:


• All-wheel drive (AWD) is disabled

• Service Rear Axle is displayed on the driver information center.


Conditions for Clearing the DTC


• The condition for setting the DTC is no longer present.

• The DTC is not detected in 40 consecutive ignition cycles.


Reference Information

Schematic Reference

Rear Axle Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Rear Drive Axle Description and Operation

Electrical Information Reference


• Circuit Testing

• Connector Repairs

• Testing for Intermittent Conditions and Poor Connections

• Wiring Repairs


Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, observe the scan tool Rear Drive Clutch Status parameter. The scan tool should display TEMPORARILY LIMITED when stationary.

Circuit/System Testing

Important

The torque transfer device solenoid valve is calibrated with and is part of the rear differential clutch control module. Both components must be replaced as a matched set.



1. Ignition OFF, replace the oil filter in the torque transfer device housing.

2. Drive the vehicle under normal operating conditions.

3. Verify DTC C0403 62 is not set.

4. If the DTC is set, replace the K47 rear differential clutch control module/Q48 torque transfer device solenoid valve assembly.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Differential Clutch Oil Filter Replacement

• Control Module References for rear differential clutch control module replacement, setup, and programming