22 CAN: Rear right wheel speed from PSM implausible

P0720

22 CAN: Rear right wheel speed from PSM implausible
The CAN wheel speed signal is monitored for an implausible value.

Diagnosis conditions
- Ignition on
- CAN message from PSM is received

Possible fault cause
- Fault in the PSM

Diagnosis/Troubleshooting







23 CAN: Rear left wheel speed from PSM implausible
The CAN wheel speed signal is monitored for an implausible value.

Diagnosis conditions
- Ignition on
- CAN message from PSM is received

Possible fault cause
- Fault in the PSM

Diagnosis/Troubleshooting







38 CAN: Communication PSM disturbed
Reception of the CAN messages from the PSM control module is checked.

Diagnosis conditions
- Ignition on
- CAN message from PSM control module is not received

Possible fault cause
- CAN bus connection between Tiptronic control module and PSM control module

Affected terminals
Terminal L, H

Diagnosis/Troubleshooting

NOTE:
- Read out the fault memory of the PSM control module and possibly rectify existing faults before troubleshooting.
- If the fault "39 CAN: DME communication disturbed" exists, there could be an open circuit in the CAN bus between the DME control module and the Tiptronic control module