C0899

DTC C0899

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

DTC Descriptor

DTC C0899 00
- Device Voltage Low - EBCM (w/o JL4)

DTC C0899 03
- Device Voltage Low - EBCM (JL4)

Diagnostic Fault Information






Circuit/System Description

The electronic brake control module (EBCM) monitors the battery positive (B+) voltage level available for system operation. A low voltage condition prevents the system from operating properly. If low voltage is detected by the EBCM, then DTC C0899 sets.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The ignition voltage available to the EBCM is less than 9 volts for 100 msec.

Action Taken When the DTC Sets

* The traction control system (TCS) and vehicle stability enhancement system (VSES) are disabled for the duration of the ignition cycle
* The vehicle dynamics caution (VDC) indicator turns ON.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.
* The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

Diagnostic Aids

* A low voltage DTC in multiple modules indicates a concern in the charging system.
* Inspect the ground connection G300. Verify that it is clean and tight.

Circuit/System Verification

1. Measure and record the voltage at the battery terminals with the engine OFF, and again with the engine running. Verify that the battery voltage is 11-17 volts with the engine OFF and with the engine running.

• If the battery voltage is not within the specified range, refer to Charging System Test. Charging System Test

2. Observe the scan tool Battery Voltage parameter in the EBCM data list. Verify that the scan tool displays a value that is within 2 volts of the battery voltage recorded in step 1.

• If the scan tool parameter is not within the specified range, refer to Circuit/System Testing.

3. Refer to Diagnostic Aids.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector of the EBCM.
2. Verify that there is less than 1.0 ohm between the ground circuit terminal 11 (JL4) or terminal 38 (w/o JL4), and the negative battery terminal.

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

3. Ignition ON, test for 9.5-13.5 volts between the B+ circuit terminal 1 (JL4) or terminal 25 (w/o JL4), and the ground circuit of the EBCM.

• If not within the specified range, test the battery positive voltage circuits for a short to ground or an open/high resistance.

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

Repair Instructions

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