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 4B: ABS Pressure Circuit Calibration Not Learned
DTC C0131 5A: ABS Pressure Circuit Calibration Not Learned Plausibility Failure
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.
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 and TCS for the duration of the ignition cycle. |
| • | The traction control indicator illuminates. |
Conditions for Clearing the DTC
| • | The condition for setting the DTC is no longer present. |
| • | The EBCM automatically 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. |
| • | 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
Control Module References for scan tool information
Circuit/System Testing
Important: Ensure the stoplamp switch is properly installed allowing the brake pedal to be fully released.
- Apply and release the brake pedal. Verify brake lamps operate properly.
- Verify DTC C0131 is not set.
| ⇒ | If not within the specified value, refer to Symptoms - Lighting Systems . |
| ⇒ | 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. |
