Diagnosis/troubleshooting PSM 5.3

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 contained under menu item "Actual values".

DIAGNOSIS/TROUBLESHOOTING PSM 5.3 (FAULT CODE 4440)

Work instruction			Display OK	If not OK
1	Check calibration of the steering angle sensor	Calibrate steering angle sensor	Calibration was incorrect ->End	Step 2
2	Check power supply of the steering angle sensor	Switch off ignition Pull off steering angle sensor plug Switch on ignition Measure voltage between pin 3 of steering angle sensor plug and ground	>11 V Step 3	Open circuit between PSM control module connector pin 2 and pin 3 of the steering angle sensor plug, or PSM contol module faulty ->End
3	Check ground of the steering angle sensor	Measure voltage between pin 3 of the steering angle sensor plug and pin 4 of the steering angle sensor plug	>11 V Step 4	Open circuit between the plug of steering angle sensor pin 4 and ground point 2 ->End
4	Check CAN-high lead from PSM control module to steering angle sensor for open circuit	Switch off ignition Pull off the PSM control module plug Measure resistance between pin 2 of steering angle sensor plug and PSM control module plug pin 61	< 5 Step 5	Open circuit between pin 2 of steering angle sensor plug and PSM control module plug pin 61 ->End
5	Check CAN-low lead from PSM control module to steering angle sensor for open circuit	Measure resistance between pin 1 of steering angle sensor plug and PSM control module connector pin 63	< 5 Step 6	Open circuit between pin 1 of steering angle sensor plug and PSM control module plug pin 63 ->End
6	Steering angle sensor faulty		->End