Description

Poor frequency signal quality

The individual measured pulse durations and/or periods vary more than allowed (no continuous signal)

Effects on the driving operation

No retarder operation.

Main pressure to maximum.

Reduction of the engine torque to protect the transmission.

Hard shifts

Possible causes

Extreme torsional vibrations.

Installation position of sensor is not correct or the sensor is loose.

The pulse-generator wheel has damages that may cause signal disturbance.

The sensor malfunctions.

Place of action

Speed sensor N4

Instruction

Check the installation position of the sensor (distance, tolerance position).

Make sure that the sensor sits tightly.

Ensure the correct function of the sensor.

Check the pulse-generator wheel for damage.

Setting conditions of the event

No description available.

Testing conditions of the event

No description available.

Final function check

If the defective component cannot be clearly identified, you should try to reproduce the fault:

• Reinstall the component in the vehicle.
• Test function.

After the fault has been eliminated, the following steps have to be carried out:

• Conduct a test drive with function check.
• Read the fault memory
• Check transmission for leaks.
• Perform a final visual inspection.

These steps are necessary to ensure the entire vehicle functions correctly.