CLAAS 75D4h – TR1: Inconsistent Reverser Lever Signal

The transmission control module has detected an illogical or conflicting signal from the reverser lever (e.g., indicating both forward and neutral simultaneously). This inconsistency triggers an audible warning, requests an ISC (Implement and Steering Control) reset, and compromises the proper operation of the machine's reversing function.

• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850
• Arion 510
• Arion 520
• Arion 530
• Arion 540
• Arion 610
• Arion 620
• Arion 630
• Arion 640

1. 1

   Check for any other active fault codes on the CAN bus network that may be triggering related errors.

2. 2

   Physically inspect the reverser lever (S171) for any signs of damage, looseness, or obstruction that might prevent it from seating correctly in its detents.

3. 3

   Inspect the electrical connector and wiring harness associated with the reverser lever for damage, corrosion, or loose connections.

4. 4

   Verify the power supply and ground connections to the relevant modules and sensors.

5. 5

   Check the connectors and continuity of the harnesses for any short circuits or open circuits.

6. 6

   Test the 'Auto 5' module (TR1 A57-1) using a specialized diagnostic tool (Part No. 60 05 033 249) to perform input/output control checks.

1. 1

   Confirm the fault

   Note all active and stored error codes from the tractor's diagnostic display (e.g., Cebis terminal).

2. 2

   Visual inspection

   Perform a thorough visual inspection of the reverser lever (S171) and its wiring harness, looking for obvious faults as described in the diagnostic checks.

3. 3

   Electrical checks

   Disconnect the battery. Disconnect the harness from the reverser lever (S171) and the TR1 (A57-1) module. Check for continuity on each wire between the lever connector and the module connector to rule out an open circuit. Check for short circuits between the individual wires in the harness and between each wire and the chassis ground.

4. 4

   Component testing

   If wiring is confirmed to be good, the issue likely lies with either the reverser lever itself or the TR1 module. If available, test the TR1 (A57-1) 'Auto 5' module using the specified diagnostic tool (60 05 033 249). If the module tests as operational, the fault is most likely with the reverser lever (S171).

5. 5

   Component replacement

   If the reverser lever is identified as the faulty component, replace it. If the diagnostic tool indicates a fault with the 'Auto 5' module, the module should be replaced.

6. 6

   Clear codes and verify repair

   After replacing the suspected component, reconnect the battery, clear all fault codes using the diagnostic system, and operate the tractor to ensure the fault does not reappear.