C0393

DTC C0393

Diagnostic Instructions

* Perform theDiagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* ReviewStrategy 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 Descriptors
DTC C0393 06
- Rear Axle Coupling Solenoid Control Circuit Short to Ground or Open/High Resistance

DTC C0393 0B
- Rear Axle Coupling Solenoid Control Circuit Current Above Threshold




Diagnostic Fault Information






Circuit/System Description

The rear differential clutch control module (CCM) provides a power and ground switching circuits to the solenoid. The solenoid receives current from the CCM 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.
* Ignition voltage is greater than 9 volts.



Conditions for Setting the DTC

C0393 06

An open or short to ground is detected on the high or low solenoid circuits.

C0393 0B

A short to voltage is detected on the high or low solenoid 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 ()
Connector End View Reference

Component Connector End Views (Connector Views)
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 following control circuit terminals and ground:

* Solenoid high control circuit terminal 5
* Solenoid low control circuit terminal 3

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


3. Ignition OFF, test for infinite resistance between the following control circuit terminals and ground:

* Solenoid high control circuit terminal 5
* Solenoid low control circuit terminal 3

• If less than the specified value, test the appropriate control circuit for a short to ground.


4. Test for less than 5 ohms of resistance between the solenoid high control terminal 5 and the solenoid low control terminal 3.

• If greater than the specified range, test both control circuits for an open/high resistance. If the circuits test normal, replace the differential rear wheel drive module clutch housing solenoid.

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



Repair Instructions

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

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