Description:

This diagnostic trouble code (TCU 524179.19) is generated if the PLC control unit is not able to determine the status of the park lock solenoid valve Y15/2 (current) and so cannot provide the CAN BUS with any relevant data. A transmitted replacement value generates this diagnostic trouble code in the TCU. In its active state, this fault also generates a diagnostic trouble code at the PLC.

Reaction:

When this error code is detected, the equipment may experience issues with the park lock solenoid valve status readings, leading to potential performance problems. The system might display warnings or enter a protective mode to prevent further issues.

Recommendations:

1. Inspect PLC Control Unit:

• Verify Operation: Ensure that the PLC control unit is functioning correctly and able to determine the status of the park lock solenoid valve.
• Check Connections: Ensure all connections to the PLC control unit are secure and free of corrosion.

2. Verify CAN BUS Communication:

• Check Data Transmission: Ensure that the CAN BUS is transmitting accurate data from the PLC control unit to the TCU.
• Inspect for Errors: Look for any errors or interruptions in the data transmission.

3. Examine Park Lock Solenoid Valve (Y15/2):

• Inspect Solenoid Valve: Ensure the park lock solenoid valve is functioning correctly and providing accurate data.
• Replace if Necessary: Replace the solenoid valve if it is found to be faulty.

4. Examine Wiring and Connectors:

• Inspect Wiring: Check all wiring and connectors associated with the park lock solenoid valve and CAN BUS system for damage or disconnection.
• Repair or Replace: Repair or replace any faulty wiring or connectors.

5. Update Software:

• Update Control Unit Software: Ensure that the PLC and TCU software are up-to-date to prevent communication issues.

Note:

Maintaining reliable CAN BUS communication and accurate park lock solenoid valve status is essential for optimal equipment performance. Regular inspections and prompt repairs can help prevent issues related to incorrect CAN BUS messages.