Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Rotor position sensor
New: The steering angle sensor in the steering column switch cluster (SZL) has been discontinued.
The steering wheel angle is now determined via the rotor position sensor of the electromechanical power steering (EPS). The rotor position sensor is integrated in the EPS control unit. The EPS supplies the non-linearised values for the steering angle. The ICM calculates the steering wheel angle.
There are 2 rotor position sensors (redundancy) on the printed circuit board of the control unit. Both sensors use the principle of the Hall effect (Hall sensor with magnet wheel). The magnet wheel is attached to the shaft of the servomotor.
| Item | Explanation |
|---|---|
| 1 | EPS control unit |
| 2 | 6-pin plug connection (steering momentum sensor) |
| 3 | Plug connection 2-pin (voltage supply) |
| 4 | six-pin plug connection |
| 5 | Servomotor |
Communication with the DSC (on FlexRay) and EPS (on PT-CAN) takes place via the central gateway module (ZGM). Depending on vehicle: Communication via Front Electronic Module (FEM).
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.