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 C0880 00: Device Voltage Reference Output CircuitDTC C12E5: Device Voltage Reference Output Circuit
DTC C0880 02: Device Voltage Reference Output Circuit Short to Ground
DTC C120F: Device Voltage Reference Output Circuit Short to Ground
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5-Volt Reference | C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5, C0880 02, C120F | C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D | C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5 | C0277 5A, C12B1, C12F8, C120C |
Brake Master Cylinder Piston Position Sensor Signal Terminal 35 | C0277 03, C129A, C129D | C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D | C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5 | C0277 5A, C12B1, C12F8, C120C |
Brake Master Cylinder Piston Position Sensor Signal Terminal 9 | C0277 03, C129A, C129D | C0277 03, C129A, C129D, C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D | C0277 5A, C12B1, C12F8, C120C, C0161 04, C127D, C0880 00, C12E5 | C0277 5A, C12B1, C12F8, C120C |
Low Reference | C0294 00, C120C, C12F8, C0161 04, C127D, C0880 00, C12E5, C0455 39 | -- | -- | C0277 5A, C12B1, C12F8, C120C |
Circuit/System Description
The electronic brake control module (EBCM) supplies a shared 5 volt reference to the brake master cylinder piston position sensor, steering angle sensor and brake master cylinder piston position sensor.
Conditions for Running the DTC
| • | Ignition ON. |
| • | The ignition voltage is greater than 10 volts. |
Conditions for Setting the DTC
The EBCM detects the voltage on the 5 volt reference circuit to the brake master cylinder piston position sensor, steering angle sensor and brake master cylinder piston position sensor is less than 4.8 volts or greater than 5.2 volts.
Action Taken When the DTC Sets
| • | The EBCM disables the antilock brake system (ABS), traction control and the vehicle stability enhancement system (VSES) for the duration of the ignition cycle. |
| • | A DIC message and/or a warning indicator may be displayed. |
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 40 consecutive drive cycles. |
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 Testing
- Verify DTC C0455 is not set.
- Verify DTC C0277 is not set.
- Ignition OFF, disconnect the harness connector at the electronic brake control position sensor.
- Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal 1 and ground.
| ⇒ | If DTC is set, refer to DTC C0455. |
| ⇒ | If DTC is set, refer to DTC C0277, C120C, C129A, C129B, C129D, C129E, C12B1, or C12F8. |
| ⇒ | If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the EBCM. |
| ⇒ | If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
