PRE-RELEASE
DTC C0403
| DTC C0403 |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| 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 rear drive clutch solenoid valve and the rear 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 |
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The ignition is ON.
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Operating temperature range 0-80°C (0-176°F).
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| 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:
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All-wheel drive (AWD) is disabled
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Service Rear Axle is displayed on the driver information center.
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| Conditions for Clearing the DTC |
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The condition for setting the DTC is no longer present.
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The DTC is not detected in 40 consecutive ignition cycles.
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| 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
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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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 | ||
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The rear drive clutch solenoid valve is calibrated with and is part of the rear differential clutch control module. Both components must be replaced as a matched set. |
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Ignition OFF, replace the oil filter in the torque transfer device housing.
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Drive the vehicle under normal operating conditions.
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| 3. |
Verify DTC C0403 62 is not set.
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| 4. |
If the DTC is set, replace the K47 rear differential clutch control module/Q48 rear drive clutch solenoid valve assembly.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Differential Clutch Oil Filter Replacement
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Control Module References
for rear differential clutch control module replacement, setup, and programming
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