2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 956

2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 956

Power Steering

DTC C0561

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic System

Check - Vehicle) prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Strategy Based Diagnosis) for an

overview of the diagnostic approach.

* Diagnostic Procedure Instructions (See: Testing and Inspection/Initial Inspection and Diagnostic Overview/Diagnostic Procedure

Instructions) provide an overview of each diagnostic category.

DTC Descriptors

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

DTC C0561 71

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

DTC 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

Schematic Reference

Power Steering Schematics (See: Steering and Suspension/Steering/Diagrams/Electrical Diagrams)

Connector End View Reference

Component Connector End Views (See: Diagrams/Connector Views)

Description and Operation

Power Steering System Description and Operation (Hydraulic Power Steering) (See: Steering and Suspension/Steering/Description and

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

(See: Steering and Suspension/Steering/Description and Operation/Power Steering System Description and Operation (EPS))