C0460

DTC C0460

Diagnostic Instructions

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



DTC Descriptors
DTC C0460 00
- Steering Position Sensor

DTC C0460 4B
- Steering Position Sensor Calibration not Learned




Circuit/System Description

The steering wheel position sensor is a 5-volt dual analog triangle signal device which is used to sense the steering systems center position to provide equal return to center and on center feel. The valid signal voltage range of the sensor is 0-5 volts. The sensors 2 signal voltages will increase and decrease within the valid signal voltage range and stay within a voltage range of each other as the steering wheel is turned.


After replacing the power steering motor/control module, the steering wheel torque/position sensors must be calibrated.


Conditions for Running the DTC


C0460 00
* Engine Running.
* Power steering system voltage is 9-16 volts.
* Slight amount of steering input.


C0460 4B

The ignition is ON.


Conditions for Setting the DTC


C0460 00
* The steering wheel position sensors signal 1 and signal 2 voltages are greater than 0.3 volts of each other.
* A short to ground, short to voltage, or an open in the steering wheel position sensor, or the circuits to the sensor.


C0460 4B

The PSCM has not undergone the steering position sensor calibration procedure.


Action Taken When the DTC Sets

* DTC is stored in memory.
* The DIC displays the POWER STEERING warning message.
* Reduced steering assist performance.
* Poor or no return to center.



Conditions for Clearing the DTC


C0460 00
* A current DTC will clear when the malfunction is no longer present and the steering wheel has been turned 1 full revolution.
* A history DTC will clear after 100 consecutive malfunction-free ignition cycles.



C0460 4B
* A current DTC will clear after the sensor calibration procedure has been performed.
* A history DTC will clear after 100 consecutive ignition cycles from when the sensor calibration procedure has been performed.



Reference Information
Schematic Reference

Power Steering Schematics (Electrical Diagrams)
Connector End View Reference

Component Connector End Views (Connector 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 (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information
Special Tools

EL-47564 Power Steering Control Module (PSCM) Test Harness


Circuit/System Verification

Engine running, observe the scan tool Steering Position Sensor Signal 1 and the Steering Position Sensor Signal 2 parameters while turning the steering wheel one full revolution. Each reading should be between 2.5-2.8 volts.


Circuit/System Testing

1. Ignition OFF, disconnect the X1 harness connector at the power steering motor/module assembly.
2. Test for less than 1 ohm between the ground circuit terminal A and ground.

• If greater than the specified range, test the ground circuit for an open/high resistance.

3. Disconnect the X3 harness connector at the power steering motor/module assembly.
4. Connect the EL-47564 Power Steering Control Module (PSCM) Test Harness.
5. Test for less than 1 ohm between the low reference circuit terminal and ground at the test harness connector.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.

6. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal and ground at the test harness connector.

• If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.
• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the power steering motor/module assembly.

7. Verify the scan tool steering position sensor signal 1 parameter is greater than 5.0 volts.

• If less than the specified range, replace the power steering motor/module assembly.

8. Install a 3A fused jumper wire between the steering position sensor signal 1 circuit terminal and the steering position sensor low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 1 parameter is less than 0 volt.

• If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.

9. Verify the scan tool steering position sensor signal 2 parameter is greater than 5.0 volts.

• If less than the specified range, replace the power steering motor/module assembly.

10. Install a 3A fused jumper wire between the steering position sensor signal 2 circuit terminal and the steering position sensor low reference circuit terminal at the test harness connector. Verify the scan tool steering position sensor signal 2 parameter is less than 0 volt.

• If greater than the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the power steering motor/module assembly.

11. If all circuits test normal, replace the steering column assembly.



Repair Instructions

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

* Power Steering Assist Motor Replacement (EPS) (Service and Repair)
* Steering Column Replacement (Electronic Power Steering) (Steering Column Replacement (Electronic Power Steering))Steering Column Replacement (Hydraulic Power Steering) (Steering Column Replacement (Hydraulic Power Steering))
* Control Module References (Programming and Relearning) for PSCM replacement, setup, and programming