CLAAS Id77F5h / 77F5h (11) – HYD (A60): CAN communication error: Instruction message of valve 5 not received or improbable

A CAN communication error where the 'Instruction' message of valve 5 is not received or is improbable. As a safety response to this condition, the system forces electrodistributor 5 to return to neutral, disabling its function.

• Axion 800 series
• Axion 810
• Axion 820
• Axion 830
• Axion 840
• Axion 850

1. 1

   Check the Hydraulic CAN bus network: Ensure there are no communication breakdowns on the network.

2. 2

   Check the hydraulic module HYD (A60): Verify the main module is functioning and outputting correctly.

3. 3

   Check the electrodistributor module (A105-5): This is the specific valve module (Valve 5) throwing the error.

4. 4

   Wiring and Harnesses: Check the connectors and continuity of the harnesses linking the HYD module and the A105-5 valve.

5. 5

   Electrical Integrity: Check for any short-circuits or open circuits in the wiring.

6. 6

   Power Sources: Check the sources of energy to the valve, including fuses, 12V power supply, and ground connections.

1. 1

   Analyze Codes

   Note all error codes present on the tractor. Analyze the interaction between them, as a primary CAN bus error can generate secondary codes.

2. 2

   Inspect Connections

   Disconnect the harness at electrodistributor 5 (A105-5) and the HYD (A60) module. Inspect the pins for corrosion, pushed-out terminals, or moisture.

3. 3

   Test Wiring

   Perform a continuity and resistance test on the CAN bus lines and power/ground wires between the valve and the hydraulic module.

4. 4

   Repair/Replace

   If a wiring fault is found (short/open circuit), repair the harness. If the wiring, power, and ground are all within specification, the electrodistributor module (A105-5) has failed internally and must be replaced.

5. 5

   Clear and Retest

   Clear all error codes from the HYD module. Operate the tractor and actuate valve 5 to ensure the electrodistributor no longer returns to neutral and the anomaly does not reappear.