Rotation speed measurement at Transmission output
Check mounting position of the sensor (tolerance position, interspace).
What you'll see
No driver-visible symptom recorded.
System reaction
ANS operation limited. Limited driving operation. Transmission control unit switches into the operational status neutral, forced neutral or waiting for neutral. No or limited retarder function. No or limited reverse gear acceptance.
Diagnostic depth
Implausible frequency.
In the mechanical gear implausible speed ratios have been measured between engine speed and transmission output speed, which are not possible due to the transmission ratio. Attention: one of the speed sensors N1 or N2 might be the cause of this fault! Eventual causes might be wrong mounting positions of the sensors, defect speed sensors, no correct frictional connection of the lamella.