C0475

DTC C0475

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 Instructionsprovide overview of each diagnostic category.

DTC Descriptor
DTC C0475 00
- Electric Steering Motor Circuit

Diagnostic Fault Information






Circuit/System Description

The power steering control module (PSCM) continuously monitors the voltage and current levels being commanded to the electric power steering (EPS) motor. The 42-volt circuit from the accessory power module (APM) supplies power to the PSCM pulse width modulated control circuit to drive the 3 phase motor. The PSCM compares the desired and actual current levels to detect malfunctions in the EPS motor, or the circuits to the motor.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

The PSCM detects an open, or a short to ground on any of the motor phase circuits.

Actions Taken When DTC Sets

* 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.

Reference Information
Schematic Reference

Power Steering Schematics Electrical Diagrams
Connector End View Reference

Component Connector End Views Connector End Views By Name
Description and Operation

Power Steering System 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 Programming and Relearningfor scan tool information

Circuit/System Testing

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.


Important: After verifying a circuit fault exists in the Power Steering Assist Motor Wiring Harness for Two Mode Hybrid, the Power Steering Assist Motor is to be replaced and not repaired


1. Perform the High Voltage Disabling High Voltage Disabling procedure.
2. Ignition OFF, connect the 12-volt battery.
3. Ignition OFF, disconnect the harness connector at the PSCM.
4. Test for less than 1 ohm between the following circuits listed below.

* Control circuit terminal 2 and control circuit terminal 1
* Control circuit terminal 1 and control circuit terminal 3
* Control circuit terminal 2 and control circuit terminal 3

• If greater than the specified range, replace the power steering assist motor.

5. Test for greater than infinite resistance between the following circuits listed below and the power steering motor housing.

* Control circuit terminal 2
* Control circuit terminal 1
* Control circuit terminal 3

• If less than the specified range, replace the power steering assist motor.

6. If all circuits test normal, test or replace the PSCM.

Repair Instructions

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

* Power Steering Assist Motor Replacement Service and Repair
* Control Module References Programming and Relearningfor PSCM replacement, setup, and programming