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 00: Device Voltage HighDiagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
B+/IGN | C0899 00 | C0899 00 | -- | -- |
Ground | -- | C0899 00 | -- | -- |
Circuit/System Description
The 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
The ignition is ON.
Conditions for Setting the DTC
The system voltage is greater than 16 V for 100 msec.
Action Taken When the DTC Sets
| • | ABS disabled if ignition voltage exceeds 19.5 V. |
| • | The Antilock Brake System (ABS) indicator turns ON if voltage exceeds 19.5 V. |
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 high voltage value in multiple modules indicates a concern in the charging system. |
| • | DTC C0900 could be set by overcharging with a battery charger or jump starting. |
| • | Inspect the ground connection G202 to ensure that it is clean and tight. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
- Engine running measure and record the voltage at the battery terminals. Verify that the battery voltage is 12.6-15.5 V
- Engine running, observe the scan tool EBCM Battery Voltage Signal parameter. The reading should be between 12.6 and 15.5 V
| ⇒ | If not within the specified range, refer to Charging System Test |
| ⇒ | If not within the specified range, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup and programming.
