Antilock Brake System

DTC C056D

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 Descriptor

DTC C056D 00
- Electronic Control Unit Hardware Malfunction

Circuit/System Description

The Electronic Brake Control Module detects an internal malfunction.

Conditions for Running the DTC

* Ignition ON.

* Ignition voltage is greater than 8 V.

Conditions for Setting the DTC

The Electronic Brake Control Module detects an internal malfunction.

Action Taken When the DTC Sets

* The ABS Indicator turns ON.

* The red Brake Warning Indicator turns ON.

* The Traction/stability Control Indicator turns ON, if equipped with electronic stability control.

* The Electronic Brake Control Module disables the ABS, and the Traction/stability for the duration of the ignition cycle.

Conditions for Clearing the DTC

* The condition for setting the DTC is no longer present.

* The history DTC will clear after 40 consecutive fault-free ignition cycles have occurred.

Reference Information

Schematic Reference

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

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly

Description and Operation

ABS Description and Operation 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 Verification

1. Verify that DTC C056D is not set.

• If the DTC is set
Replace the K17 Electronic Brake Control Module.

• If the DTC is not set

2. All OK.

Repair Instructions

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

Control Module References Control Module References for Electronic Brake Control Module replacement, programming and setup