Description:

This diagnostic trouble code (TCU 002221.09) is generated when a data transfer problem occurs between the PLC and TCU. Specifically, the reception of CAN messages from the PLC control unit regarding the status of the park lock and wheel speed sensor (B84) is intermittent or nonexistent. This intermittent reception could be due to a loose wire or other communication issues.

Reaction:

When this error code is detected, the equipment may experience erratic behavior or reduced performance due to unreliable data on the park lock status and wheel speed. The system might enter a protective mode to prevent potential damage.

Recommendations:

1. Inspect CAN BUS Communication:

• Check Connections: Ensure that all CAN BUS connections between the PLC and TCU are secure and free of corrosion.
• Inspect for Loose Wires: Look for any loose wires or connectors that could cause intermittent data transfer.

2. Test Communication Integrity:

• Use Diagnostic Tools: Use diagnostic tools to test the integrity of the CAN BUS communication.
• Monitor Data Transfer: Monitor the data transfer between the PLC and TCU to identify any interruptions.

3. Examine Wiring and Connectors:

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

4. Verify PLC Functionality:

• Test PLC: Ensure that the PLC is functioning correctly and transmitting accurate data.
• Update Software: Update the PLC software if necessary.

Note:

Maintaining reliable CAN BUS communication between the PLC and TCU is essential for optimal equipment performance. Regular inspections and prompt repairs can help prevent data transfer issues.