Removing and Installing

Removing and installing steering angle sensor

Note: A steering angle sensor (C) is attached to the steering column/steering shaft in the 911 Carrera (996) with PSM (Porsche Stability Management).





The cover (D) remains fitted during removal and installation of the steering angle sensor (C).

Important note on steering wheel position for removal and installation
Turn front wheels to straight-ahead position. Lock the steering wheel and the front wheels in this position and ensure that this position is maintained for reinstallation. The universal joint A can now be detached from the upper steering shaft and and refitted in the same position during installation.
If this is not done, the airbag contact unit (spiral spring) can be damaged. Also, the steering wheel can be crooked with the front wheels in straight-ahead position after installation of the steering angle sensor!


Removal
1. Remove driver's seat.
2. Disconnect battery ground cable.
3. Turn front wheels to straight-ahead position. Affix the front wheels and the steering wheel in this position.





4. Undo hexagon--head bolt on universal joint A. Detach universal joint A from the upper steering shaft and push into the lower steering shaft (direction arrow). Disengage cable guide B in the direction of travel.





5. Pull plug off of steering angle sensor (direction arrow).

Important: Pull at the plug housing only. Never pull the electrical connections. Disengage steering angle sensor C forwards. To do this, press the sensor carefully through the opening in the cover D (direction arrow).

Installation
1. Insert and engage steering angle sensor.

Note: The steering angle sensor must audibly engage.

2. Fasten steering shaft (universal joint) in the correct position on the upper steering shaft (the same position as before removal). In the correct position means: front wheels, steering wheel and airbag contact unit in the same position as before removal. Use new fastening screw. Use correct tightening torque.

Note: If the steering wheel was not fixed before the steering angle sensor was removed, the position of the contact unit (spiral spring) may no longer be correct. In this event, remove steering wheel and move contact unit to center position.

If this is not done, the spiral spring can be damaged.

Important: Driver's airbag does not function if contact unit is damaged!

Observe mounting specifications.
3. Push plug onto steering angle sensor.
4. Engage cable guide B and route cable to cable guide B (Figure above step 4, under Removal).
5. Calibrate steering angle sensor with wheels in straight-ahead position on measuring platform.

Note on steering angle sensor position
The steering angle sensor has no defined zero position when new. The position for "straight ahead" direction of travel must be programmed. This is done by calibrating with the Porsche System Tester 2 with the wheels in straight-ahead position.

Important: Malfunctions in the PSM control range if the steering angle sensor is not calibrated or is calibrated incorrectly!

Calibrate steering angle sensor with wheels in straight-ahead position on measuring platform.