Antilock Brake System - Greater than/Equal to 3900 kg (8600 lb) GVW

DTC C0131 (With JL4)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (with HP2) (Initial Inspection and Diagnostic Overview)Diagnostic System Check - Vehicle (without HP2) (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.

DTC Descriptors
DTC C0131 01
- ABS Pressure Circuit Short to Battery

DTC C0131 03
- ABS Pressure Circuit Below Threshold

DTC C0131 06
- ABS Pressure Circuit Short to Ground or Open

DTC C0131 55
- ABS Pressure Circuit Expected Number of Transition/Events exceeded

DTC C0131 4B
- ABS Pressure Circuit Calibration Not Learned

DTC C0131 5A
- ABS Pressure Circuit Plausibility Failure

DTC C0131 0F
- ABS Pressure Circuit Erratic

Circuit/System Description

The body control module (BCM) sends a serial data message when the brake pedal is applied. The electronic brake control module (EBCM) compares the brake pressure sensor values to ensure they agree with the brake pedal applied signal.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

* Brake signal does not correlate to pressure signal.
* Signal is erratic and changes faster than physically allowed.

Action Taken When the DTC Sets

* The Traction Control indicator turns ON.
* The driver information center (DIC) displays the Service Stability System message.

Conditions for Clearing the DTC

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 (Greater than/Equal to 3900 kg (8600 lb) GVW)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

ABS Description and Operation (Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information

Circuit/System Testing

1. Apply and release brake pedal. Verify brake lamps operate properly.

• If brake lamps do not operate properly, refer to Symptoms - Lighting (- Symptoms - Lighting).

2. Replace the brake pressure modulator valve (BPMV) assembly.

• If the DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Brake Pressure Modulator Valve Replacement (Service and Repair)
* Control Module References (Programming and Relearning)for EBCM replacement, setup, and programming