C0393

DTC C0393

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0393 02
- Rear Differential Clutch Solenoid Valve Control Circuit Short to Ground

DTC C0393 04
- Rear Differential Clutch Solenoid Valve Control Circuit Open

DTC C0393 0B
- Rear Differential Clutch Solenoid Valve Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

The rear differential clutch control module provides a power and ground switching circuits to the rear drive clutch coil. The coil receives current from the rear differential clutch control module through PWM low side driver, and converts that signal into torque through the clutch to the rear tires when all wheel drive (AWD) is requested.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

* An open is detected on the high or low coil control circuits.

* A short to ground is detected on the high or low coil control circuits.

* A short to voltage is detected on the high or low coil control circuits.

Action Taken When the DTC Sets

One or more of the following actions may occur:

* All Wheel Drive Off (AWD Disabled).

* Service All Wheel Drive (Service AWD).

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

Rear Axle Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Rear Drive Axle Description and Operation Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Programming and Relearning for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the X2 harness connector at the K47 rear differential clutch control module.

2. Ignition ON.

3. Verify a test lamp does not illuminate between the following circuits and ground:

* Low reference terminal 3

* Voltage terminal 5

• If the test lamp illuminates
Repair the short to voltage on the appropriate circuit.

• If the test lamp does not illuminate

4. Ignition OFF.

5. Test for infinite resistance between the following circuit terminals and ground:

* Low reference terminal 3

* Voltage terminal 5

• If less than infinite resistance
Repair the short to ground on the appropriate circuit.

• If infinite resistance

6. Test for 1-5.0 ohms between the low reference circuit terminal 3 and the voltage supply terminal 5.

• If 5 ohms or greater
Test the circuits for an open/high resistance. If the circuits test normal, replace the Q28 rear drive clutch.

• If less than 1 ohms
Test for a short between the circuits. If the circuits test normal, replace the Q28 rear drive clutch.

• If 1-5 ohms

7. Replace the K47 rear differential clutch control module.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Rear Wheel Drive Module Clutch Housing Replacement Rear Wheel Drive Module Clutch Housing Replacement.

* Control Module References Programming and Relearning for rear differential clutch control module replacement, programming, and setup.