Fendt A.1.14 – ECU, enhanced control (A002): Spool valve fault on Valve 1 (Y015)

Main piston travel is too short due to a drop in control pressure below 22 bar (valve actuator falls short). As a safety consequence, the affected valve automatically moves into the neutral position.

• 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
• Farmer 400 Vario Series: 409, 410, 411, 412
• Favorit / Vario 700 Series: 711, 712, 714, 715, 716, 717, 718
• Favorit / Vario 800 Series: 815, 817, 818, 820, 828
• Favorit / Vario 900 Series: 916, 920, 924, 926, 930, 933, 936, 939

1. 1

   Check hydraulic oil temperature to ensure it is at normal operating levels, as cold oil can trigger this fault

2. 2

   Test the control pressure at measurement point M5 (must be at least 22 bar)

3. 3

   Test the diaphragm accumulator for failure, which can cause sudden pressure drops

4. 4

   Inspect and test the RV7 control pressure valve

1. 1

   Warm up tractor and clear code

   Warm up the tractor to ensure the hydraulic oil is at normal operating temperature, then clear the code to see if it returns.

2. 2

   Locate Y015 Auxiliary Control Valve

   Locate the Y015 Auxiliary Control Valve (Valve 1), which is typically designated as the 'yellow' valve on the rear terminal plate.

3. 3

   Connect pressure gauge

   Connect a pressure gauge to test port M5 to monitor the control pressure.

4. 4

   Actuate valve and inspect accumulator

   Actuate the valve. If the pressure drops below 22 bar, inspect the diaphragm accumulator for a ruptured bladder or loss of nitrogen charge. Replace the accumulator if it fails to hold pressure.

5. 5

   Check RV7 valve

   Check the RV7 control pressure valve for sticking or debris.

6. 6

   Replace Y015 spool valve actuator/head

   If the control pressure remains steady above 22 bar but the A.1.14 code persists and the valve still defaults to neutral, the Y015 spool valve actuator/head is internally faulty and the valve unit must be replaced.