For 1990-2009 cars only
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 C0900 07: Device Voltage above ThresholdDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Battery Voltage Signal Circuit | C0899 03 | C0899 03 | C0900 07 | -- |
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition voltage. If the voltage level is too high, damage may result in the system. When a high voltage condition is detected the EBCM turns OFF the system relay which removes battery voltage from the solenoid valves and pump motor.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
The system voltage is greater than 16 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 ABS is disabled if ignition voltage exceeds 19.5 volts. |
| • | The Stability System Off and Traction Control Off indicators illuminate. |
| • | The antilock brake system (ABS) indicator illuminates if voltage exceeds 19.5 volts. |
Conditions for Clearing the DTC
| • | The condition for the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Diagnostic Aids
| • | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
| • | A high voltage DTC in multiple modules indicates a concern in the charging system. |
Circuit/System Verification
- If the DTC is history, or if other modules also have high voltage DTCs stored, refer to Charging System Test .
- Start the engine, record the voltage at the battery terminals. Observe the scan tool Battery Voltage Signal parameter in the EBCM data list. Voltages should not differ by greater than 1 volt.
| ⇒ | If the difference is greater than 1 volt, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming.
