Fault Code 4420

Fault Code 4420

Rate-of-turn sensor

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

Possible cause of fault
- Short circuit to ground/B+ or open circuit
- Wiring/plug connection faulty
- Rate-of-turn sensor faulty
- PSM control module faulty

Affected terminals
PSM 5.7 terminals 9, 10,21,39,41
PSM 5.3 terminals 34, 77, 78, 79, 80

Diagnosis/troubleshooting PSM 5.7

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.

Rate-of-turn sensor with combined transverse acceleration sensor

Part 1:

Part 2:

Diagnosis/troubleshooting PSM 5.3

Rate-of-turn sensor