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 00: ABS Pressure Circuit No Additional InformationDTC C0131 5A: ABS Pressure Circuit Plausibility Failure
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
Ignition ON.
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. |
| • | Brake pedal does not return completely causing residual brake pressure. |
Action Taken When the DTC Sets
| • | The EBCM disables the VSES / TCS 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 setting the DTC is no longer present. |
| • | The EBCM clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles. |
Diagnostic Aids
| • | Inspect for a binding or obstructed brake pedal or an improperly installed stop lamp switch causing residual brake pressure. |
| • | The pressure sensor is integral to the brake pressure modulator valve (BPMV). The pressure sensor is not serviceable. |
Reference Information
Schematic Reference
Antilock Brake System Schematics
Connector End View Reference
Description and Operation Reference
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Apply and release the brake pedal. Verify brake lamps operate properly and the pedal to full return.
- Verify DTC C0131 is not set.
| ⇒ | If not within the specified value, refer to Symptoms - Lighting. |
| ⇒ | If DTC is set, replace the BPMV and verify DTC does not reset. If 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. |
