C0475

DTC C0475

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provide overview of each diagnostic category.



DTC Descriptor
DTC C0475 00
- Electric Steering Motor Circuit




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 (APM) supplies power to the PSCM pulse width modulated command circuit to drive the brushless, 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

The ignition is 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

* DTC C0475 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.



Reference Information
Connector End View Reference

Component Connector End Views
Description and Operation

Power Steering System Description and Operation (HPS) (Power Steering System Description and Operation (HPS))Power Steering System Description and Operation (EPS) (Power Steering System Description and Operation (EPS))
Electrical Information Reference

* Circuit Testing
* Connector Repairs
* Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information


Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the PSCM.
2. Test for less than 1 ohm between the following circuits listed below.

* U phase terminal 2 and V phase terminal 1
* V phase terminal 1 and W phase terminal 3
* U phase terminal 2 and W phase terminal 3


• If greater than the specified range, test the appropriate circuit for an open/high resistance. If the circuits test normal, replace the electric power steering (EPS) motor.

3. Test for greater than 1 Mega ohms between the following circuits listed below and the motor flange.

* U phase terminal 2
* V phase terminal 1
* W phase terminal 3


• If less than the specified range, test the appropriate circuit for a short to ground. If the circuits test normal, replace the EPS motor.

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



Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


Control Module References