Speed sensor for sun gear 3 Sensor voltage too low
|  | Description
|  | Effects on the driving operation
|  | Possible causes
|  | Place of action
|  | Instruction
|  | Setting conditions of the event
|  | Testing conditions of the event
|  | Final function check
Description Sensor voltage too low If the sensor voltage drops below 4.5 V, the speed sensor signal cannot be evaluated anymore. 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 Defect of the sensor, low-resistance connection between the two sensor terminals or defect of the transmission control unit Place of action Speed sensor for sun gear 3 (sensor voltage) Transmission control unit Instruction Measure voltage at the speed sensor. Check plug connections, cabling and sensor. 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.
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