Circuit Description
The Steering Wheel Position Sensor provides the EBTCM with an analog voltage reading from 0.2-4.8V 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 (Phase A, Phase B and 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 tires when driving in a straight line. 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 Steering Wheel Position Sensor analog output voltages falls outside 0.2-4.8V range.
Action Taken When the DTC Sets
A malfunction DTC is stored. Magna Steer is disabled ABS/TCS remains active.
Diagnostic Aids
The following are possible causes:
| • | A Steering Wheel Position Sensor circuit open. |
| • | A Steering Wheel Position Sensor shorted. |
Perform an inspection of the wiring and of the connectors. Failure to carefully and fully 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 step numbers on the diagnostic table.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Was the Diagnostic System Check performed? | -- | Go to Diagnostic System Check | |
2 |
Is the voltage within the range specified in the value(s) column? | 0.2 - 4.8V | ||
3 |
Is the voltage within the range specified in the value(s) column? | 4.5 - 5V | ||
4 |
Is the resistance within the range specified in the value(s) column? | 0 - 5ohms | ||
Using the J 39200 DMM, measure the voltage at terminal 6 of the Steering Wheel Position Sensor harness connector. Is the voltage within the range specified in the value(s) column? | Above 1V | |||
6 | Repair CKT 1059 for a short to voltage. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the resistance within the range specified within the value(s) column? | OL (infinite) | |||
8 | Repair CKT 1059 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
Is the resistance within the range specified within the value(s) column? | 0 - 5ohms | |||
10 | Repair CKT 1059 for an open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
11 | Replace the EBTCM. Refer to Electronic Brake and Traction Control Module . Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
12 | Replace the Steering Wheel Position Sensor. Refer to Steering Wheel Position Sensor Replacement in Steering Wheel and Column. Is the replacement complete? | -- | Go to Diagnostic System Check | -- |
13 |
Is the resistance within the range specified within the value(s) column? | OL (infinite) | ||
14 | Repair CKT 1056 for an open. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
15 |
Is the resistance within the range specified in the values column? | OL (infinite) | ||
16 | Repair CKT 1056 for a short to ground. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
17 | Repair CKT 556 for an open or high resistance. Refer to Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Diagnostic System Check | -- |
