For 1990-2009 cars

### 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
DTC C0131 5A: ABS Pressure Circuit Plausibility Failure

### Circuit/System Description

The electronic brake control module (EBCM) monitors the inputs of the 2 internal brake pressure sensors and compares the reading so they correlate.

### Conditions for Running the DTC

Ignition ON.

### Conditions for Setting the DTC

#### C0131 00

The EBCM detects an internal pressure sensor are fault.

#### C0131 5A

The EBCM detects the 2 internal brake pressure sensor readings do not correlate.

### Action Taken When the DTC Sets

• | The EBCM disables the ABS/traction control system (TCS)/vehicle stability enhancement system (VSES) 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.

### Reference Information

#### Schematic Reference

Antilock Brake System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation Reference

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

• | Connector Repairs

#### Scan Tool Reference

Control Module References for scan tool information

### Circuit/System Verification

#### C0131 00

1. Replace the brake pressure modulator valve (BPMV).
2. With a scan tool, perform the steering angle sensor calibration procedure.
3. Verify DTC does not reset. If DTC reset, replace the EBCM.

#### C0131 5A

Verify DTC C0131 5A is not set.

⇒ | If DTC is set, with a scan tool perform the special function, steering angle sensor calibration.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

• | Brake Pressure Modulator Valve Replacement

• | Control Module References for EBCM replacement, setup, and programming