Description:

This diagnostic trouble code (TCU 000604.02) is generated when the transmission enable signal (neutral signal, lead 6064) from the transmission enable relay (K06/03 or K02/03) does not match the position of the reverse drive lever (transmitted by the UIC control unit). Relay K06/03 is used in tractors up to Serial Number Break 2008, and Relay K02/03 is used in tractors from Serial Number Break 2008.

Reaction:

When this error code is detected, the equipment may not properly enable the transmission, leading to potential issues with gear selection and operation. The system might enter a protective mode to prevent further issues, resulting in limited operational capabilities.

Recommendations:

1. Inspect Transmission Enable Relay:

• Verify Relay Operation: Ensure that the correct relay (K06/03 or K02/03) is installed and functioning properly.
• Check Relay Connections: Ensure that all connections to the relay are secure and free of corrosion.

2. Test the Transmission Enable Signal:

• Measure Signal Voltage: Use a multimeter to measure the voltage at the transmission enable signal (lead 6064).
• Replace if Necessary: Replace the relay if it is not providing the correct signal.

3. Examine Wiring and Connectors:

• Inspect Wiring: Check the wiring between the relay, UIC control unit, and transmission enable signal for damage or disconnection.
• Repair or Replace: Repair or replace any faulty wiring or connectors.

4. Verify Control Unit Functionality:

• Test UIC Control Unit: Ensure that the UIC control unit is correctly processing the transmission enable signals.
• Update Software: Update the control unit software if necessary.

Note:

Regular maintenance and inspection of the transmission enable relay and associated wiring are essential for proper transmission operation. Ensure all components are in good working condition to prevent signal mismatches.