Power Steering

DTC C056D

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (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) provide an overview of each diagnostic category.



DTC Descriptor
DTC C056D 39
- ECU Hardware Performance Internal Electronic Failure




Circuit/System Description

The power steering control module (PSCM) continuously monitors the internal circuitry within the module.


Conditions for Running the DTC

Ignition ON.


Conditions for Setting the DTC

This DTC will set if the PSCM detects an internal malfunction within the module.


Actions Taken When DTC Sets

* DTC C056D is stored in memory.
* The driver information center (DIC) displays the SERVICE POWER STEERING warning message.
* No steering assist.



Conditions for Clearing the DTC

* A current DTC will clear on the next malfunction free ignition cycle.
* A history DTC will clear after 100 consecutive malfunction-free ignition cycles, without the repeat of the internal malfunction.



Reference Information
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Power Steering System Description and Operation (HPS) (Power Steering System (EPS))Power Steering System Description and Operation (EPS) (Power Steering System (EPS))
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 Verification

Danger: Always perform the High Voltage Disabling procedure prior to servicing any High Voltage component or connection. Personal Protection Equipment (PPE) and proper procedures must be followed.


The High Voltage Disabling procedure will perform the following tasks:


* Identify how to disable high voltage.

* Identify how to test for the presence of high voltage.

* Identify condition under which high voltage is always present and personal protection equipment (PPE) and proper procedures must be followed.


Failure to follow the procedures exactly as written may result in serious injury or death.




Note

Verify the motor connector is securely connected and not loose.


Verify that DTC C056D is not set.

If the DTC is set, replace the PSCM.



Repair Instructions

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


Control Module References (Programming and Relearning) for PSCM replacement, setup, and programming