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 Descriptor
DTC C0131 00: Traction Control System Pressure Circuit MalfunctionDTC C0131 5A: Traction Control System Pressure Circuit Not Plausible
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
5 V Reference | C0131 00 | C0131 00 | C0131 00 | -- |
Signal | C0131 00 | C0131 00 | -- | C0131 5A |
Circuit/System Description
The brake pressure sensor is integral to the brake pressure modulator valve assembly. The electronic brake control module (EBCM) monitors the brake pressure sensor supply voltage and the signal voltage. The body control module (BCM) sends a serial data message when the brake pedal is applied.
Conditions for Running the DTC
Ignition ON.
Conditions for Setting the DTC
C0131 00
| • | A short to voltage is detected on the 5 V reference circuit for 0.1 s |
| • | A short to ground or an open/high resistance is detected on the 5 V reference circuit or signal circuit for 0.1 s |
C0131 5A
| • | The brake pressure sensor signal is not plausible with the vehicle acceleration or deceleration. |
| • | The EBCM detected an invalid or erratic brake pressure sensor signal. |
| • | The brake pressure sensor signal is not plausible with the brake switch signal. |
Action Taken When the DTC Sets
| • | The EBCM disables the ABS, traction control, stability control and hill start assist for the duration of the ignition cycle. |
| • | The traction control/stability control-active indicator turns ON. |
Conditions for Clearing the DTC
| • | A current DTC clears when the diagnostic runs and passes. |
| • | The EBCM will turn OFF the indicator in the next ignition cycle. |
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 Verification
Ignition ON, observe the scan tool Brake Pressure Sensor parameter. The reading should be 0 V, when brake pedal is released and greater than 1 V, when the brake pedal is applied.
Circuit/System Testing
- Verify that DTC C0131 5A is not present.
- Replace the brake pressure modulator valve assembly and verify the DTC does not reset.
| ⇒ | If DTC C0131 5A is present, perform the LINK X Brake Pressure Sensor Calibration. |
| ⇒ | If the DTC resets replace the K17 Electronic Brake Control Module (EBCM). |
Repair Instructions
| • | Perform the Diagnostic Repair Verification after completing the diagnostic procedure. |
| • | Control Module References for EBCM replacement, setup and programming |
