Fendt A.1.2F – ELECTRICAL VALVES: Spool valve fault, valve 2

Setpoint message is missing or not plausible, or the configuration message is missing or not plausible. Typically caused by a potentiometer or PWM signal fault. As a safety consequence, the system forces the valve to move into the neutral position and locks it out.

• 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 (COM III) (e.g., 411, 412, 413, 414, 415)
• Fendt 700 Vario (COM III) (e.g., 712, 714, 716, 718)
• Fendt 800 Vario (COM III) (e.g., 818, 820)
• Fendt 900 Vario (COM I, II, and III) (e.g., 916, 920, 924, 926, 930)

1. 1

   Check the setpoint and actual value display for SPOOL VALVES 1-4 on the tractor's terminal for discrepancies in Valve 2 (Y016)

2. 2

   Inspect the Variotronic multifunction joystick or actuator controlling Valve 2 to ensure it centers by itself and has no excessive play

3. 3

   Check the CAN-BUS and wiring harness (referencing Sheet 28 for Y016) for broken wires or corroded pins causing a loss of the setpoint signal

4. 4

   Verify that the supply voltage to the valve is within the normal operating range of 8 to 18 Volts

1. 1

   Clear and Rescan

   Connect a diagnostic tool (such as TEXA or FENDIAS) to the tractor's diagnostic socket. Scan the Comfort BUS and Hydraulic Valve BUS to see if the A.1.2F error is active or stored.

2. 2

   Test the Joystick

   If the diagnostic tool shows the joystick potentiometer is failing to send a plausible PWM signal, the joystick itself may need to be repaired or replaced.

3. 3

   Inspect the Valve Electronics

   If the joystick is sending the correct signal, the fault lies in the electronics of the Y016 valve itself. Disconnect the electrical coupler at Valve 2 and check for moisture, corrosion, or pin damage.

4. 4

   Replace the Valve/Solenoid

   If the valve's internal electronics (EEPROM/configuration) have failed, replace the auxiliary control valve or its solenoid.

5. 5

   EOL Programming / Calibration

   If a new valve or joystick is installed, or if the configuration message was lost, you must perform EOL (End of Line) programming/calibration using the diagnostic tool so the Valve Bus recognizes the new component.