Rotation speed measurement at turbine
â–¶ How to fix
Check mounting position of the sensor (tolerance position, interspace).
What you'll see
No driver-visible symptom recorded.
System reaction
No or limited retarder function.
Diagnostic depth
Detection
Implausible frequency.
Possible cause
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.