C0394

DTC C0394

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.

DTC Descriptor
DTC C0394 06
- Rear Axle Coupling Solenoid Temperature Sensor Circuit Short to Ground or Open

Diagnostic Fault Information





Circuit/System Description

The rear differential clutch control module (CCM) provides a power and ground circuits to the temperature sensor. When the temperature of the module is determined to be beyond its limits, the CCM will temporarily disable the rear drive system.

Conditions for Running the DTC

* The ignition is ON.
* Ignition voltage is greater than 9 volts.

Conditions for Setting the DTC

An open or short to ground is detected on the temperature sensor circuits.

Action Taken When the DTC Sets

All wheel drive indicator illuminates.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The DTC is not detected in 40 consecutive drive cycles.

Reference Information
Schematic Reference

All-Wheel Drive Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

All-Wheel Drive Description and Operation (All-Wheel Drive Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector X2 at the rear differential clutch control module.
2. Ignition ON, verify a test lamp does not illuminate between the signal circuit terminal 2 and ground.

• If the test lamp illuminates, test the signal circuit for a short to voltage.

3. Ignition OFF, test for infinite resistance between the signal circuit terminal 2 and ground.

• If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the rear wheel drive module clutch housing.

4. Test for 310-113K ohms of resistance between the signal circuit terminal 2 and the low reference circuit terminal 4.

• If less than the specified range, test both circuits for a short together. If the circuits test normal, replace the rear wheel drive module clutch housing.
• If greater than the specified range, test both circuits for an open/high resistance. If the circuits test normal, replace the rear wheel drive module clutch housing.

5. If all circuits test normal, replace the CCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Rear Wheel Drive Module Clutch Housing Replacement (Rear Wheel Drive Module Clutch Housing Replacement)
* Control Module References (Programming and Relearning) for CCM replacement, setup, and programming