(Without JL4)

DTC C0131 (Without JL4)

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC C0131 01

-
ABS Pressure Circuit Short to Battery

DTC C0131 03

-
ABS Pressure Circuit Voltage Below Threshold

DTC C0131 06

-
ABS Pressure Circuit Short to Ground or Open

DTC C0131 0F

-
ABS Pressure Circuit Erratic

DTC C0131 4B

-
ABS Pressure Circuit Calibration not Learned

DTC C0131 5A

-
ABS Pressure Circuit Plausibility Failure

DTC C0131 55

-
ABS Pressure Circuit Expected Number of Transitions or Events not Reached

Circuit/System Description

The electronic brake control module (EBCM) monitors the brake pressure sensor. The information the EBCM receives from the brake pressure sensor is sent through serial data circuits to the trailer brake control module (TBCM). The TBCM uses this information to perform trailer brake functions. The brake pressure sensor is mounted to the master cylinder.

Conditions for Running the DTC

* The ignition switch is in the ON position.

* Ignition voltage is greater than 9.5 volts.

Conditions for Setting the DTC

* Signal is erratic and changes faster than physically allowed.

* Pressure signal does not correlate to estimated pressure over time.

Action Taken When the DTC Sets

* A driver information center message and/or a warning indicator may be illuminated.

* The EBCM disables the vehicle stability enhancement system for the duration of the ignition cycle.

Conditions for Clearing the DTC

* The condition for the DTC is no longer present.

* The EBCM automatically clears the history DTC when a current DTC is not detected in 40 consecutive drive cycles.

Reference Information

Schematic Reference

* Antilock Brake System Schematics [1][2]Antilock Brakes / Traction Control Systems

* Hydraulic Brake Schematics Electrical Diagrams

Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)

Description and Operation

ABS Description and Operation (Without JL4) Description and OperationABS Description and Operation (With JL4) Description and Operation

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the brake pressure sensor.

2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance.

3. Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal B and ground.

• If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance.

• If greater than the specified range, test the 5 V reference circuit for a short to voltage.

4. If all circuits test normal, test or replace the brake pressure sensor. If DTC resets, replace the EBCM.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair.

* Brake Master Cylinder Pressure Sensor Replacement Service and Repair

* Control Module References Control Module References for EBCM replacement, programming and setup