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 06: ABS Pressure Circuit Short to Ground or Open
DTC C0131 55: ABS Pressure Circuit Expected Number of Transition/Events Exceded
DTC C0131 4B: ABS Pressure Circuit Calibration Not Learned
DTC C0131 5A: ABS Pressure Sensor Plausibility Failure
DTC C0131 0F: ABS Pressure Circuit Erratic
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
ABS Pressure Circuit | C0131 00 | C0131 00 | C0131 00 | -- |
Pressure Circuit Calibration Not Learned | -- | -- | -- | C0131 4B |
Pressure Circuit Calibration Not Learned Plausibility Failure | -- | -- | -- | C0131 5A |
Circuit/System Description
The electronic brake control module (EBCM) uses input from the brake pressure sensor for more accurate control during a Vehicle Stability Enhancement System (VSES) event.
Conditions for Running the DTC
| • | The ignition is ON. |
| • | Ignition voltage is greater than 9.5 volts. |
Conditions for Setting the DTC
| • | Pressure signal does not correlate to estimated pressure over time. |
| • | Brake signal does not correlate to pressure signal. |
| • | Signal is erratic and changes faster than physically allowed. |
Action Taken When the DTC Sets
| • | The EBCM disables the VSES and TCS for the duration of the ignition cycle. |
| • | The electronic stability control (ESC) telltale turns ON. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present and the DTC is cleared with a scan tool. |
| • | The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
The pressure sensor is integral to the brake pressure modulator valve (BPMV). The pressure sensor is not serviceable.
Inspect the brake pressure sensor contacts for proper connections.
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation Reference
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
- Apply and release brake pedal. Verify brake lamps operate properly.
- Replace EBCM/brake pressure modulator valve (BPMV) assembly.
| ⇒ | If brake lamps do not operate properly, review brake lamps inoperative. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for EBCM replacement, setup, and programming
