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 C0407 02: AWD Oil Pump Motor Short to GroundDTC 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 04 | -- | C0407 0B, C0407 64 |
Low Reference | C0407 02 | C0407 04 | C0407 04 | C0407 02 |
Component | Condition | DTCs |
|---|---|---|
AWD Oil Pump Motor | Oil leak, oil pump defect | C0407 0B, C0407 64 |
Circuit/System Description
The oil pump motor is installed in the torque transfer device housing. The rear differential clutch control module supplies battery voltage to the control circuit and ground to the low reference circuit of the oil pump motor. As soon as the engine is started the oil pump motor will be activated. The oil pump is running until the pressure of approximately 3200 kPa (464 PSI) is reached. The oil pump motor power consumption is the indicator for the oil pressure. The consumption is constant when the full system pressure is reached. The rear differential clutch control module shuts down the pump motor when the full system pressure is reached. Below approximately 2700 kPa (392 PSI) the pump motor will be restarted.
Conditions for Running the DTC
C0407 02 and C0407 04
| • | The ignition is ON. |
| • | The oil pump motor voltage is above 4.8 V. |
C0407 0B
| • | The ignition is ON. |
| • | The oil pump motor is running. |
| • | The oil temperature is above 0°C (32°F). |
C0407 64
| • | The ignition is ON |
| • | The oil pump motor voltage is above 11.5 V. |
| • | The oil temperature is above -20°C (-4°F). |
Conditions for Setting the DTC
C0407 02
The oil pump current is more than 9.0 A in 20 consecutive test cycles. The current will be retested every 30 s.
C0407 04
The oil pump current is less than 0.3 A for 30 s.
C0407 0B
The oil pump current is more than 7.0 A for 2 s in 10 consecutive test cycles.
C0407 64
The oil 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 AWD 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 the DTC is no longer present. |
| • | The DTC is not detected in 40 consecutive power cycles. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
All-Wheel Drive Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for diagnostic tester information
Circuit/System Verification
Engine running, observe the scan tool Rear Differential Clutch Pump Motor Current parameter. The reading should be between 800-5000 mA when stationary.
Circuit/System Testing
- Ignition OFF, inspect for signs of damage of the wire, the oil pump motor and the housing.
- Replace the M32 Oil Pump Motor.
- Ignition ON, verify the DTC does not reset.
| ⇒ | If a damage is visible, replace the appropriate component. |
| ⇒ | If the DTC resets, replace the K47 Rear Differential Clutch Control Module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for rear differential clutch control module replacement, setup, and programming |
