Power Steering

DTC C0460 (Symptom 00)

Diagnostic Instructions

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

DTC Descriptor

DTC C0460 00

- Steering Position Sensor

Circuit/System Description

The power steering control module (PSCM) continuously monitors the motor rotational sensor sinusoidal voltage signals. The sinusoidal voltage signals of the motor rotational sensor and the angle difference between the steering column output and input shafts detected by the torque sensor are both processed by the PSCM to detect and calculate the steering wheel angle.

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC

The PSCM detects open, short to ground or short between any of the motor rotational sensor circuits.

Actions Taken When DTC Sets

* DTC C0460 00 is stored in memory.
* The driver information center (DIC) displays the SERVICE POWER STEERING 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

Connector End View Reference

Power Steering Connector End Views

Description and Operation

Power Steering System Description and Operation

Electrical Information Reference

* Testing for Intermittent Conditions and Poor Connections
* Circuit Testing

Scan Tool Reference

* Scan Tool Data Definitions
* Scan Tool Data List

Circuit/System Verification

Ignition ON, verify that scan tool parameter Steering Wheel Angle is +/- 90 degrees when turning steering wheel +/- 90 degrees.

Circuit/System Testing

1. Ignition OFF, disconnect the CN2 harness connector at the power steering motor.
2. Ignition OFF, test for 2-20 ohms of resistance between the exciting circuit terminal 4 and the exciting ground circuit terminal 6.
^ If outside the specified range, test the exciting circuit and the excitng ground circuit for an open/high resistance or a short. If the circuit tests normal, replace the steering motor.

3. Ignition OFF, test for 100-500 ohms of resistance between the SIN circuit terminal 3 and the exciting ground circuit terminal 6.
^ If outside the specified range, test the SIN circuit and the excitng ground circuit for an open/high resistance or a short. If the circuit tests normal, replace the steering motor.

4. Ignition OFF, test for 300-1K ohms of resistance between the COS circuit terminal 2 and the exciting ground circuit terminal 6.
^ If outside the specified range, test the COS circuit and the excitng ground circuit for an open/high resistance or a short. If the circuit tests normal, replace the steering motor.

5. Ignition OFF, test for greater than 1M ohms of resistance between the exciting ground circuit terminal 6 and the motor flange.
^ If less than the specified value, test the excitng ground circuit for a short to ground. If the circuit tests normal, replace the steering motor.

6. If all circuits test normal, test or replace the power steering control module (PSCM).

Repair Instructions

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

* Control Module References
* Power Steering Assist Motor Replacement
* Electronic Power Steering Motor Control Module Replacement