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 Descriptors
DTC C0800 03 : Device Power Circuit Voltage Below ThresholdDTC C0800 07: Device Power Circuit Voltage Above Threshold
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
IGN I | C0800 | C0800 | -- | -- |
Ground | -- | C0800 | -- | -- |
Circuit/System Description
The electronic brake control module (EBCM) monitors the ignition voltage level available for system operation. A low voltage condition prevents the system from operating properly, 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 voltages supplied to the control module is in the range of 7-26 volts. |
| • | The ignition is ON. |
| • | The engine is running. |
Conditions for Setting the DTC
C0800 03
This DTC will be set if the system voltage to EBCM is less than 9 volts for 100 msec.
C0800 07
This DTC will be set if the system voltage is greater than 16 volts for 100 msec.
Action Taken When the DTC Sets
| • | Antilock Brake System (ABS) and Traction Control System (TCS) are disabled for the duration of the ignition cycle. |
| • | The ABS and TCS indicators illuminates on the IPC. |
| • | The DIC displays the Service Stability System message, if equipped. |
Conditions for Clearing the DTC
The DTC clears when the system voltage returns to a normal range.
Diagnostic Aids
| • | A high or low voltage DTC set in multiple control modules indicates a concern in the charging system. |
| • | A possible cause of this DTC could be overcharging with a battery charger or jump starting. |
| • | A high or low voltage value in multiple control modules indicates a concern in the charging system. |
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Charging System 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 volts.
- Engine running, observe the scan tool EBCM System Voltage parameter.
- Verify the scan tool parameter displays a value that is within 2 volts of the battery terminal voltage.
| ⇒ | If the battery voltage is not within the specified range, refer to Charging System Test |
Circuit/System Testing
- Ignition OFF. Disconnect the harness connectors at the EBCM.
- Verify there is less than 3 ohms between the ground circuit terminals 13 and 26 to ground.
- Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal 20 and ground.
- Ignition ON, verify a test lamp illuminates between the battery positive voltage circuits terminals 1-14-44 and ground.
- If all circuits test normal, replace the EBCM.
| ⇒ | If greater than the specified value, test the ground circuits for an open/high resistance. |
| ⇒ | If the test lamp did not illuminate , test the ignition voltage circuit for a short to ground or an open/high resistance. |
| ⇒ | If the test lamp did not illuminate , test the affected battery positive voltage circuit for a short to ground or an open/high resistance. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
