C0455

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CIRCUIT DESCRIPTION
The Steering Wheel Position Sensor provides the EBTCM with an analog voltage reading from 0.15-4.84V depending on the steering wheel angle. The EBTCM uses the analog voltage for the centering routine. The EBTCM runs a centering routine when the vehicle speed goes above 30 Km/h (18 mph). When the vehicle reaches 30 Km/h (18 mph), the EBTCM monitors the Steering Wheel Position Sensor inputs (Analog voltage) to see if the steering wheel is moving. If the steering wheel is not moving for a set period of time then the EBTCM assumes the vehicle is going in a straight line. At this point, the EBTCM looks at the analog voltage signal and reads the voltage. This voltage, normally around 2.5V, is then considered the center position and the digital degrees also become zero at the same time. This centering routine is necessary to compensate for wear in the steering and suspension. Wear in the steering and suspension can result in a change in the relationship between the steering wheel and the front wheels. By running the centering routine, the EBTCM can compensate for these changes by changing the digital and analog center position.

CONDITIONS FOR SETTING THE DTC
- The center position is +/-21.5° deviation from the previous nominal center point (0°) after the centering routine is complete.
- The Steering Wheel Position Sensor analog output voltage falls outside the 0.15-4.84V range.

ACTION TAKEN WHEN THE DTC SETS
- Correct function of the Steering Wheel Position Sensor is incorrect and the EBTCM stops using the sensor's data.
- Magnasteer(R) remains active using wheel speed data only.
- A malfunction DTC is stored.
- No ABS/TCS indicators are turned on and ABS/TCS remains active.

CONDITIONS FOR CLEARING THE DTC
- Condition for DTC is no longer present and scan tool clear DTC function is used.
- 100 ignition cycles have passed with no DTCs detected.

DIAGNOSTIC AIDS
The following are possible causes:
- The steering wheel was rotated with the steering gear disconnected.
- A malfunctioning Steering Wheel Position Sensor.
- A Steering Wheel Position Sensor circuit open.
- A Steering Wheel Position Sensor circuit shorted.
- A malfunctioning EBTCM.
Perform an inspection of the wiring and of the connectors. Failure to carefully inspect the wiring and the connectors may result in misdiagnosis. Misdiagnosis causes part replacement with reappearance of the malfunction.

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
5. Re-centers the Steering Wheel Position Sensor.
11. Checks for an open in CKT 556.
12. Checks for a short to voltage in CKT 1059.
14. Checks for a short to ground in CKT 1059.
16. Checks for an open in CKT 1059.
18. Checks for a short to battery in CKT 1056.
20. Checks for an open in CKT 1056.
22. Checks for a short to ground in CKT 1056.