Fendt A.1.22 – Enhanced Control ECU: Y016 (Spool valve 2 / Auxiliary control valve, position 2) Supply voltage < 8 volts

Supply voltage is below 8 volts. Due to the low voltage, the system cannot reliably control the valve. As a safety measure, the main piston of the valve automatically moves into the neutral position, and valve operation is disabled.

• 409 Vario
• 410 Vario
• 411 Vario
• 412 Vario
• 711 Vario
• 712 Vario
• 714 Vario
• 715 Vario
• 716 Vario
• 717 Vario
• 718 Vario
• 916 Vario
• 920 Vario
• 924 Vario
• 926 Vario
• 930 Vario
• Fendt Farmer 400 Vario series
• Fendt Favorit 700 Vario series
• Fendt Favorit 900 Vario series
• Fendt 300 Vario series
• Fendt 400 Vario series
• Fendt 700 Vario series
• Fendt 800 Vario series
• Fendt 900 Vario series (including COM III generation models)

1. 1

   Check the tractor's battery and alternator to ensure proper system voltage.

2. 2

   Inspect fuses F040 and F041, which supply power to the CAN bus and valve circuit boards.

3. 3

   Locate Spool Valve 2 (color-coded Blue) on the rear hydraulic block and inspect it.

4. 4

   Disconnect electrical connector X327 (pins 24 and 26) for Valve 2 and measure supply voltage at the harness side with the key on. It should be 12V.

5. 5

   Trace the wiring harness from connector X327 back to the ECU, looking for chafed wires, corrosion, or loose grounds that could cause a severe voltage drop.

1. 1

   Resolve Wiring Faults

   If the diagnostic tests reveal less than 8 volts at the connector, repair the damaged wiring harness, clean the ground points, or replace the blown/corroded fuse (F040/F041).

2. 2

   Clean Connections

   If voltage is borderline, clean connector X327 with electrical contact cleaner, ensure the pins are tight, and apply dielectric grease. Reconnect and clear the codes.

3. 3

   Replace the Spool Valve

   If the harness delivers proper voltage but the A.1.22 code remains active (indicating the valve's internal circuit board has failed), the Y016 spool valve must be replaced.

4. 4

   Depressurize the System

   Turn off the tractor and relieve all hydraulic pressure before unbolting the valve from the hydraulic slice block.

5. 5

   Install New Valve

   Bolt the new spool valve into position 2 and plug in connector X327.

6. 6

   EOL Programming

   Connect the FENDIAS diagnostic tool to teach the new valve to the CAN bus so the ECU recognizes it as Valve 2 in the EOL (End of Line) program.