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 C0899 03: Device Voltage Low

### Diagnostic Fault Information

Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance
--- | --- | --- | --- | ---
Ignition 1 Signal | C0899 | C0899 | -- | --

### Circuit/System Description

The coupling control module (CCM) monitors the ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly.

### Conditions for Running the DTC

Ignition is ON.

### Conditions for Setting the DTC

This fault will be set if the ignition voltage to EBCM is less than 9 volts for 100 msec.

### 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 100 consecutive drive cycles.

### Reference Information

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

• | Scan Tool Data List

• | Scan Tool Data Definitions

### Circuit/System Testing

1. Measure the voltage at the battery terminals.
2. With scan tool, read the ignition voltage in the CCM data list. Verify that battery terminal voltage, and ignition voltage readings do not differ more than 1 volt.

⇒ | If more than 1 volt, test the ground circuit of the CCM for high resistance. If the circuit test normal, test or replace the CCM.

3. Refer to Battery Inspection/Test or Charging System Test .

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for EBCM replacement, setup and programming