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 provides an overview of each diagnostic category. |
DTC Descriptors
DTC C0460 00: Steering Position SensorDTC C0460 4B: Steering Position Sensor Calibration not Learned
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
EPS B+ | U2143 00, U211 00,* | U2143 00, U211 00,* | -- | -- |
EPS Ignition | U2143 00, U211 00,* | U2143 00, U211 00,* | -- | -- |
5-V Reference | C0545 00 | C0545 00 | -- | -- |
Steering Position Sensor Signal | C0460 00 | C0460 00 | C0460 00 | C0460 00 |
Steering Position Sensor Signal | C0460 00 | C0460 00 | C0460 00 | C0460 00 |
Torque Sensor Signal | C0545 00 | C0545 00 | C0545 00 | C0545 00 |
Torque Sensor Signal | C0545 00 | C0545 00 | C0545 00 | C0545 00 |
Low Reference | C0545 00 | C0545 00 | -- | -- |
PSCM Ground | -- | U2143 00, U211 00,* | -- | -- |
* No communication with PSCM | ||||
Circuit/System Description
The steering wheel position sensor is a 5-volt dual analog 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 steering column or power steering control module (PSCM), the steering wheel torque and 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.
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. |
Diagnostic Aids
If the PSCM continues to set a history DTC C0460 replace the steering column before replacing the PSCM. Some steering columns may have an intermittent internal wiring condition causing the history DTC C0460.
If the Steering torque or position sensor calibrations are incorrect the customer may complain of steering effort that is easier in one direction than the other. Performing the steering torque and position sensor calibrations procedure will correct this issue.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Power Steering System Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Special Tools
EL-47564 Power Steering Control Module (PSCM) Test Harness
Circuit/System Verification
C0460 00
- Ignition ON, observe the scan tool Steering Wheel Position Sensor Signal 1 and 2 parameters. The readings should be between 0-5 V and change in opposite directions of each other while turning the steering wheel. Each parameter will increase from 0-5 V then decrease from 5-0 V while turning the steering wheel one complete revolution.
- Center the steering wheel; observe the scan tool Steering Wheel Position parameter. The reading should be zero percent and display an increasing positive or negative value while turning the steering wheel off center.
| ⇒ | If the steering wheel position parameter is not at zero percent when centered or does not display an increasing positive or negative value while turning the steering wheel off center perform the steering torque and position sensor calibrations. |
C0460 4B
Verify that DTC C0460 4B is not set.
| ⇒ | If the DTC is set, perform the Steering Position Sensor Calibration procedure. If the DTC resets, replace the PSCM. |
Steering torque and position sensor calibrations
- Center the steering wheel.
- Using the scan tool Perform the Steering Position Sensor Calibration procedure.
- Using the scan tool Perform the Torque Sensor Calibration procedure.
- Turn the steering wheel until it stops in each direction.
Important: After centering the steering wheel, remove hands and other objects from the steering wheel and ensure the suspension is relaxed and no bias, or uneven force is being applied to the steering system.
Circuit/System Testing
C0460 00
- Disconnect the X3 harness connector at the power steering module assembly.
- Connect the EL-47564 Power Steering Control Module (PSCM) Test Harness.
- Ignition OFF, test for less than 2 Ω between the low reference circuit terminal E and ground.
- Ignition ON, test for 4.8-5.2 V between the 5 V reference circuit terminal B and ground.
- Install a 3A fused jumper wire between the signal circuit terminal A and the 5V reference circuit terminal B. Verify the scan tool Steering Position Sensor Signal 1 is greater than 4.8V.
- Install a 3A fused jumper wire between the signal circuit terminal D and the 5V reference circuit terminal B. Verify the scan tool Steering Position Sensor Signal 2 is greater than 4.8V.
- If all circuits test normal, test or replace the steering column.
| ⇒ | If greater than the specified range, replace the power steering control module. |
| ⇒ | If less than the specified range, replace the power steering control module. |
| ⇒ | If less than the specified value, replace the power steering control module. |
| ⇒ | If less than the specified value, replace the power steering control module. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for PSCM replacement, setup, and programming |
