Fault Code 4440

Fault Code 4440

Steering Angle 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
- Steering angle 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 21, 39
- Steering angle sensor calibration incorrect
- Wiring/plug connection faulty
- Steering angle sensor faulty

Affected terminals
- Terminals 21, 39

Diagnosis/troubleshooting

NOTE: Calibration of the steering angle sensor must be performed on a measuring platform. The steering angle sensor must be calibrated after work has been carried out on the running gear in the area of the front axle. The security code is required for calibration of the steering angle sensor. The security code is read with the PST2 under menu item "Actual values". Calibration is described under Steering Angle Sensor, Traction Control - Adjustments - Calibrating steering angle sensor.




Work instructions