Impulse sensor
â–¶ How to fix
Check the cable harness. Check whether any prohibited changes have been made. Pair up a new impulse sensor with the tachograph and check whether it works. If the new impulse sensor works, renew the defective impulse sensor and calibrate the new impulse sensor with the tachograph.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
Detection
The information from the impulse sensor and ABS/EBS is contradictory.
Possible cause
The impulse sensor indicates that the vehicle is stationary whereas the ABS/EBS indicates that the vehicle is in motion.