ABS With ESP and TCS

C1390
Wheel Sensor. Wrong Number of Teeth






Fault symptoms
Warning lamps for ESP and brakes are on as also is the central warning lamp.
ESP OFF warning lamp is on.
No ABS, TCS, ESP function.

Conditions
The respective wheel speed value is compared with a reference value (=the filtered mean speed of all four wheels).
- One wheel speed >25% higher than the reference speed for 20 seconds.
- Two wheel speeds >6% higher than the reference speed for 80 seconds.
- One wheel speed <6% lower than the reference speed for 20 seconds, or two wheel speeds for 10 seconds.
- Continuous ABS modulation for more than 60 seconds.

Diagnostic Help
The respective wheel speed sensor signal can be read using the diagnostic tool.
- Select "Read values".
- Select: "Wheel speed".
Current wheel speed in km/h (mph) is displayed.