Calibrating Steering-Angle Sensor
- Unexpected vehicle handling
- Steering-angle sensor does not function
- Malfunction in steering-angle sensor
→ After working on wheel suspension parts, when replacing the steering-angle sensor, and after changing the wheel alignment values, calibrate the steering-angle sensor using the PIWIS Tester.
→ Keep the front wheels in straight-ahead position on the measuring platform during calibration.
→ For vehicles with electromechanical steering, also re-teach the electric steering lock settings.
NOTIFICATION
Voltage drop
- Irreparable damage to control unit
- Damage to control unit
- Fault entries in the control unit
- Control unit programming/coding is aborted
- Malfunctions in the control unit, even during programming
→ Switch off ignition before disconnecting the control unit.
→ Make sure that the power supply is not interrupted during programming/coding.
→ Connect the battery charger with at least > current 90 A to the vehicle battery.
Check chassis alignment according to Porsche specifications and make adjustments if necessary.
> 449503 MEASURE VEHICLE FRONT AND REAR
Turn wheels and steering wheel to straight-ahead position.
Attach steering wheel alignment gauge > VAS 6826 - Steering wheel alignment gauge.
| Location | Description | Type | Basic value | Tolerance |
|---|---|---|---|---|
| Steering wheel in straight-ahead position | Deviation from horizontal position | Torque angle | 0° | +/- 5° |
Connect tester to the vehicle and start it. Switch on ignition.
Select the vehicle type if necessary.
Select in the overview the Steering wheel electronics control unit. Press F12 to continue. Should a vehicle analysis protocol (VAL) be created? Press F11 to continue.
Select Maintenance/repairs.
Select steering-angle sensor calibration. Press F12 to continue.
Read and follow instructions and information. Press F12 to continue and then press F8 to start.
Perform calibration according to menu guidance.
Read out fault memory. Clear it if necessary.
Exit the diagnostic application. Switch off ignition. Disconnect tester from vehicle.