C0393

DTC C0393

Diagnostic Instructions

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

DTC Descriptors

DTC C0393 06
- Rear Axle Coupling Solenoid Control Circuit

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

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

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.

Circuit/System Verification

DTC C0393 will set as result of CCM Solenoid or circuit failure, test for power and ground circuits to the CCM.

Repair the power or ground circuits.

Circuit/System Testing

Important: It is recommend that Component Testing is performed before Circuit Testing when diagnosing the clutch control Solenoid.

1. Ignition OFF, disconnect the 5-way harness connector at the CCM.
2. Test the CCM high or low circuits for an open or short to ground.

- If the circuit tests normal, replace the CCM solenoid.

3. Connect a DMM between the CCM high or low circuit terminal and ground.
4. Test for less than 1.0 volt between the CCM high or low circuit and ground.

- If the greater than 1.0 volt, test for a short to voltage on the CCM solenoid high or low circuits. If the circuit tests normal, replace the solenoid.

5. Test for less than 5.0 ohm between the CCM high or low circuit to the CCM solenoid.

- If greater then 5.0 ohm replace the solenoid.

- If all the circuit tests normal, replace the CCM module.

Repair Instructions

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

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