For 1990-2009 cars

### 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 C0394 06: Rear Axle Coupling Solenoid Temperature Sensor Circuit Short to Ground or Open

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
AWD Fluid Temperature Sensor Signal | C0394 06 | C0394 06 | -- | --
AWD Fluid Temperature Sensor Low Reference | -- | C0394 06 | -- | --

### 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.

### Conditions for Setting the DTC

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

### Action Taken When the DTC Sets

One or more of the following actions may occur:

• | All Wheel Drive Off (AWD Disabled), DIC message

• | Service All Wheel Drive (Service AWD), DIC message

### 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

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

All-Wheel Drive 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 Testing

1. Ignition OFF, disconnect the X1 harness connector 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 clutch assembly.

4. Test for 310-113K ohms 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 differential clutch drum assembly.

⇒ | If greater than the specified range, test both circuits for an open/high resistance. If the circuits test normal, replace the differential clutch drum assembly.

5. If all circuits test normal, replace the rear differential clutch control module.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Differential Clutch Drum Assembly Replacement

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