C0800

DTC C0800





Circuit Description
The electronic brake control module (EBCM) monitors the battery supply voltage available to the EBCM.

DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC C0800 System Voltage Low, System Voltage High, or System Voltage Performance

Conditions for Running the DTC
DTC C0800 can be set anytime the ignition switch is in the ON position.

Conditions for Setting the DTC
Vehicle speed is above 6 km/h (4 mph) and one of the following occurs:
^ EBCM battery supply voltage drops below 9.4 volts and the ABS/TCS is not active
^ EBCM battery supply voltage drops below 8.8 volts and the ABS/TCS is active
^ EBCM battery supply voltage exceeds 17.4 volts

Action Taken When the DTC Sets
^ The EBCM disables the antilock brake and traction control systems for the duration of the ignition cycle.
^ The ABS, TRAC OFF and BRAKE warning indicators turn ON.

Conditions for Clearing the DTC
The condition responsible for setting the DTC no longer exists and the Scan Tool Clear DTCs function is used.

Diagnostic Aids
Thoroughly inspect the wiring and the connectors. An incomplete inspection of the wiring and the connectors may result in a misdiagnosis, causing a part replacement with the reappearance of the malfunction.
The following are possible causes of the malfunction:
^ A charging system malfunction
^ An open, high resistance or short to ground in the EBCM battery supply voltage circuits
^ An open or high resistance in the EBCM ground circuit
^ An internal EBCM malfunction

If an intermittent malfunction exists, refer to Testing for Intermittent Conditions and Poor Connections.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step tests the charging system.
4. This step tests the battery supply voltage circuit for an open, high resistance or short to ground.
5. This step tests the EBCM ground circuit for an open or high resistance.