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 Descriptor

DTC C0131 00: ABS/TCS Pressure Circuit.

### Circuit/System Description

The Electronic Brake Control Module (EBCM) detects an internal malfunction.

### Conditions for Running the DTC

The ignition is ON.

### Conditions for Setting the DTC

EBCM detects a fault in the hydraulic modulator pressure sensor signal voltage output.

### Action Taken When the DTC Sets

• | The EBCM disables the ABS-TCS/ESP for the duration of the ignition cycle.

• | One or all of the following warning indicators may activate:

- | ABS-TCS warning indicator

- | ABS-TCS warning display

- | ESP warning indicator

- | Red Brake Warning indicator

- | Trac-off warning display

### Conditions for Clearing the DTC

The EBCM automatically clears the history DTC when a current DTC is not detected in 100 consecutive drive cycles.

### Reference Information

#### Description and Operation

ABS Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### Circuit/System Verification

DTC C0131 will set as result of internal (EBCM) circuit failure.

⇒ | Replace the EBCM.

### Repair Instructions

Perform the Diagnostic Repair Verification

Control Module References