Power Steering

DTC C0561

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 Descriptor
DTC C0561 71
- System Disabled Information Stored Invalid Serial Data Received

DTC C0561 76
- System Disabled Information Stored Below Allowable Range

Circuit/System Description

The PSCM monitors vehicle speed validity message from the engine control module (ECM) via the serial data circuit. The power steering control module (PSCM) uses this vehicle speed message, along with the torque sensor and motor rotational sensor inputs, to determine the desired amount of steering assist.

The PSCM monitors the intermediate voltage power limit request message from the accessory power module (APM) to detect a possible overheating event. The hybrid control module (HCM) sends this message to the PSCM via the serial data gateway module to reduce the APM power output to the PSCM until the APM returns to normal operating temperature.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

C0561 71

The PSCM receives an invalid, vehicle speed message from the ECM.

C0561 76

The PSCM receives the intermediate voltage power limit request message to ramp down the power assist due to a possible APM overheating event.

Actions Taken When DTC Sets

* DTC is stored in memory.
* The driver information center (DIC) displays the SERVICE POWER STEERING warning message.

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.
* Steering assist is reduced.

Reference Information
Connector End View Reference

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

Power Steering System Description and Operation (Hydraulic Power Steering) Power Steering System (Hydraulic Power Steering)Power Steering System Description and Operation (EPS) Power Steering System (EPS)
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

Verify that no DTCs are set in the ECM or APM.

If DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle