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 Descriptors
DTC C0131 01: ABS Pressure Circuit Short to BatteryDTC C0131 03: ABS Pressure Circuit Below Threshold
DTC C0131 06: ABS Pressure Circuit Short to Ground or Open
DTC C0131 55: ABS Pressure Circuit Expected Number of Transition/Events exceeded
DTC C0131 4B: ABS Pressure Circuit Calibration Not Learned
DTC C0131 5A: ABS Pressure Circuit Plausibility Failure
DTC C0131 0F: ABS Pressure Circuit Erratic
Circuit/System Description
The body control module (BCM) sends a serial data message when the brake pedal is applied. The electronic brake control module (EBCM) compares the brake pressure sensor values to ensure they agree with the brake pedal applied signal.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
| • | Brake signal does not correlate to pressure signal. |
| • | Signal is erratic and changes faster than physically allowed. |
Action Taken When the DTC Sets
| • | The Traction Control indicator turns ON. |
| • | The driver information center (DIC) displays the Service Stability System message. |
Conditions for Clearing the DTC
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
Control Module References for scan tool information
Circuit/System Testing
- Apply and release brake pedal. Verify brake lamps operate properly.
- Replace the brake pressure modulator valve (BPMV) assembly.
| ⇒ | If brake lamps do not operate properly, refer to Symptoms - Lighting. |
| ⇒ | If the DTC resets, replace the EBCM. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for EBCM replacement, setup, and programming |
