C0473

For a full page schematic, refer to Steering Controls Schematics (WHO RTD) or Steering Controls Schematics (W/RTD).


Circuit Description
The steering wheel position/speed sensor is a 0 to 5 volt device which is used to measure steering wheel position. The valid output voltage range from the sensor is 0.35 to 4.75 volts. The output voltage will increase or decrease within the valid voltage range as the steering wheel is rotated. Vehicles not equipped with the Z55 option (RTD) have only 1 signal that is used by the Body Control Module (BCM). The sensor is mounted at the base of the steering column.


Conditions for Running the DTC
Vehicle speed is greater than 50 MPH for at least 1 0 seconds.


Conditions for Setting the DTC
The body control module detects a steering hand wheel position/speed sensor out-of-range condition when the vehicle speed is greater than 50 MPH for at least 10 seconds.


Action Taken When the DTC Sets
The Electronic Variable Orifice (EVO) outputs will be disabled for the remainder of the ignition cycle.


Conditions for Clearing the DTC
- The body control module no longer detects a steering wheel speed/position sensor out-of-range condition.
- A history DTC will clear after not seeing the malfunction for 100 consecutive ignition cycles.
- Using the scan tool.


Diagnostic Aids
The following conditions may cause the malfunction to occur:
- There is a short to ground or voltage in the signal circuit.
- There is an open in the signal circuit.
- Perform a visual inspection for loose or poor connections at all related components.
- Refer to Testing for Intermittent and Poor Connections.


Test Description
The numbers) below refer to the step number(s) on the diagnostic table.
2. Verifies sensor voltage range.
3. Tests for the proper operation of the circuit in the high voltage range.
4. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
5. Tests for a short to ground and an open in the 5 volt reference circuit.
7. Tests for a short to voltage, a high resistance, or an open circuit.
14. The control module must be recalibrated when replacement is necessary.