Fault Code 4420

Fault Code 4420

Rate-of-turn sensor

NOTE: If the fault codes 4400 Transverse acceleration sensor, 4420 Rate-of-turn sensor and 4440 Steering-angle sensor are displayed together, there may be an open circuit in the circuit to control module terminal 39.

Diagnostic conditions
- Rate-of-turn sensor actual value is evaluated and displays an implausible value

Possible cause of fault
- Short circuit to ground/voltage or open circuit in circuit to control module terminals 9, 10, 21, 39, 41
- Wiring/plug connection faulty
- Rate-of-turn sensor faulty
- PSM control module faulty

Affected terminals
- Terminals 9, 10, 21, 39, 41

Diagnosis/troubleshooting, Rate-of-turn sensor 996.606.145.00 as of 08/00

The following troubleshooting procedure applies to the rate-of-turn sensor 996.606.145.00 as of 08/00.




Rate-of-turn sensor 996.606.145.00




Work instructions 1 to 6




Work instructions 7 and 8

Diagnosis/troubleshooting, Rate-of-turn sensor 996.606.147.00 up to 07/00

NOTE: If the rate-of-turn sensor with part No. 996.606.147.00 is determined to be faulty, install the new rate-of-turn sensor with part No. 996.606.145.00. The front centre console holder and the lower front centre console support must be replaced for this purpose. An adapter plug must be used for the plug connection.

The following troubleshooting procedure applies to the rate-of-turn sensor 996.606.147.00 up to 07/00.





Rate-of-turn sensor 996.606.147.00




Work instructions 1 to 6




Work instructions 7 and 8