CCM

DTC C0899 (CCM)

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 C0899 03
- Device Voltage Low - CCM




Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The rear differential clutch control module (CCM) monitors the voltage level available for system operation. A low voltage condition prevents the system from operating properly. If the CCM detects that the battery voltage is low, DTC C0899 03 sets.


Conditions for Running the DTC

The ignition is ON.


Conditions for Setting the DTC

The CCM detects that the battery voltage is less than 9 volts for 100 msec.


Action Taken When the DTC Sets

The all-wheel drive is disabled.


Conditions for Clearing the DTC

* The DTC passes when the condition for the DTC is no longer present.
* A history DTC is cleared when low voltage 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

Rear Drive Axle 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 Verification

1. Engine running, accessories OFF, measure and record the battery voltage at the battery terminals. The voltage should be between 12.6 and 15.0 volts.

• If not within the specified range, Refer to Charging System Test (Charging System Test) .

2. Observe the scan tool CCM Battery Volts parameter. The reading should be between 12.6 and 15.0 volts.



Circuit/System Testing

1. Ignition OFF, disconnect the harness connectors at the CCM.
2. Ignition OFF and scan tool disconnected, open and close the driver door, and wait 30 seconds. Test for less than 5 ohms between the ground circuit terminal 3 X1 and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Verify that a test lamp illuminates between the B+ circuit terminal 6 X1 and ground.

• If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

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



Repair Instructions

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


Control Module References (Programming and Relearning) for CCM replacement, setup and programming.