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DTC C0407

DTC C0407

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 Descriptors

DTC C0407 02

AWD Oil Pump Motor Short to Ground

DTC C0407 04

AWD Oil Pump Motor Open

DTC C0407 0B

AWD Oil Pump Motor High Current

DTC C0407 64

AWD Oil Pump Motor Component Slipping

Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performance
Control

C0407 02, C0407 0B

C0407 04

-

-

Low Reference

-

C0407 04

-

-



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 motor current levels. When the pressure reaches approximately 3 200 kPa (464 PSI), the rear differential clutch control module determines that the system pressure has been obtained and deactivates the differential clutch pump. When the pressure drops below approximately 2 700 kPa (392 PSI), the rear differential clutch control module will reactivate the differential clutch pump.

Conditions for Running the DTC


• The ignition is ON.

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


Conditions for Setting the DTC

C0407 02

The differential clutch pump current is greater than 9 A in 20 consecutive test cycles. The current will be retested every 30 s.

C0407 04

The differential clutch pump current is less than 0.3 A for 30 s.

C0407 0B

The differential clutch pump current is greater than 7 A for greater than 2 s in 10 consecutive test cycles.

C0407 64

The differential clutch pump current is below a threshold at the end of a pump activation cycle in 30 consecutive test cycles. The measured current is less than 1.5 A from the threshold. The threshold is temperature dependent.

Action Taken When the DTC Sets


C0407 02 and C0407 04

• All-wheel drive (AWD) is disabled

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


C0407 0B and C0407 64

An error report entry is stored, no further action is performed.

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


1. Ensure that all differential fluid levels are at the proper levels. Refer to Differential Clutch Oil Inspection .

2. If a fluid level is below specifications, inspect the rear differential assembly for leaks and repair as necessary. Refill to the proper level, clear codes, and road test. Verify that DTC C0407 64 is not set. If the DTC resets, proceed to Circuit System Testing.

3. If a fluid level is above specifications, replace the rear differential assembly.

4. Engine running, observe the scan tool Rear Differential Clutch Pump Motor Current parameter. The parameter displayed should be between 2 500-3 500 mA when the pump is ON.


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, disconnect the X2 harness connector at the K47 Rear Differential Clutch Control Module.

2. Test for infinite resistance between the differential clutch pump control circuit terminal A and ground.

3. If less than the specified value, replace the M32 Differential Clutch Pump.

4. Test for 1.5-20 Ω between the control circuit terminal A and the low reference circuit terminal B.

5. If not within the specified range, replace the M32 Differential Clutch Pump.

6. Replace the K47 Rear Differential Clutch Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Differential Clutch Pump Replacement

• Differential Carrier Assembly Replacement

• Control Module References for module replacement, setup, and programming