Fendt A.1.40 – A002 - ECU, enhanced control: Y018 - Auxiliary control valve

No signal from the valve to the valve bus available. The valve cannot be recognized by the valve CAN bus, resulting in a complete loss of operation for this specific hydraulic valve (Valve 4, green).

• 411 Vario COM III
• 412 Vario COM III
• 413 Vario COM III
• 414 Vario COM III
• 415 Vario COM III
• 712 Vario COM III
• 714 Vario COM III
• 716 Vario COM III
• 718 Vario COM III
• 818 Vario COM III
• 820 Vario COM III
• Fendt 300 Vario (COM III)
• Fendt 400 Vario / Farmer 400 (including COM III)
• Fendt 700 Vario / Favorit 700 (including COM III)
• Fendt 800 Vario (including COM III)
• Fendt 900 Vario / Favorit 900 (including COM III)

1. 1

   Check the CAN Bus power supply by inspecting fuses F040 and F041 on printed circuit board A013

2. 2

   Inspect connector X329 at the Y018 valve for corrosion, backed-out pins, or moisture

3. 3

   Test the CAN II bus lines for continuity and resistance between the A002 ECU (pins 4 and 5) and the Y018 valve connector, looking for open circuits or shorts

4. 4

   Verify the valve is receiving proper operating supply voltage (must be between 8 and 18 volts)

1. 1

   Turn off the tractor and relieve all hydraulic pressure.

2. 2

   Locate the Y018 auxiliary control valve on the hydraulic control block.

   It is designated as "Position 4" and is associated with the green color code.

3. 3

   Disconnect connector X329 from the valve.

   Clean the contacts with electrical contact cleaner and verify the wiring integrity back to the A002 ECU.

4. 4

   Check fuses F040 and F041 on the A013 circuit board.

   Replace if necessary.

5. 5

   Determine if the communication failure is internal to the Y018 valve's integrated electronics.

   This is the case if the wiring, fuses, and power supply are all confirmed to be in good working order.

6. 6

   Remove the faulty Y018 auxiliary control valve from the hydraulic block and install the replacement valve.

7. 7

   Program the new auxiliary control valve using the FENDIAS diagnostic software (EOL program).

   You must assign the new valve to "Position 4 (green)" so the A002 ECU can recognize it on the valve bus.