Electronic Suspension Control

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC C056D
- Electronic Control Unit

For symptom byte information, refer to Symptom Byte List Symptom Byte List.

Circuit/System Description

The parking brake control module has an internal motor, apply actuator, release actuator, and temperature sensor. The parking brake control module also contains the logic for applying and releasing the parking brake when commanded by the park brake control switch. When the parking brake control module receives a signal from the switch the internal circuit board temperature is checked to verify it is within operating range before the control module performs the requested operation. The parking brake module will perform diagnostics on the modules internal hardware to verify it is functioning properly

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The electronic suspension control module detects an internal hardware malfunction.

Action Taken When the DTC Sets

* The electric suspension control is disabled.

* A message and/or a warning indicator may be displayed.

Conditions for Clearing the DTC

* The electronic suspension control module clears the history DTC when a current DTC is not detected in 40 ignition cycles.

* The condition for the DTC is no longer present.

Reference Information

Schematic Reference

Electronic Suspension Control Schematics Electrical Diagrams.

Connector End View Reference

Component Connector End Views Fuel Pump and Level Sensor Assembly.

Electrical Information Reference

* Circuit Testing Circuit Testing.

* 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.

Circuit/System Verification

1. Ignition ON.

2. Verify that DTC C056D is not set.

• If the DTC is set
Replace the K19 Suspension Control Module.

• If the DTC is not set

3. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the repair

Control Module References Control Module References for Electronic Suspension Control Module programming and setup.