Fendt A.1.4F – A002 E-box: Fault with Y018 - Auxiliary control valve (Spool Valve 4)

Setpoint message is missing or not plausible, or a CAN-BUS error with the valves. This typically indicates a potentiometer or PWM fault, causing the system to lock the valves and force Valve 4 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
• 400 Vario Series
• 700 Vario Series
• 800 Vario Series
• 900 Vario Series (including 916, 920, 924, 926, 930)

1. 1

   Verify CAN Bus communication to ensure Valve 4 is registered on the bus.

2. 2

   Check supply voltage at the valve (system forces neutral if voltage is below 8V, above 18V, or spikes over 45V).

3. 3

   Test the potentiometer and PWM signals for Valve 4 to ensure plausible setpoint/actual values.

4. 4

   Inspect the valve actuator mechanically to ensure it is not stuck, can return to neutral, and can reach the float position.

5. 5

   Check for an EEPROM inconsistency or fault while storing/loading data in the A002 E-box.

1. 1

   Connect Diagnostic Tool

   Connect a compatible multi-brand electronic diagnostic tool (such as a TEXA Navigator TXTs) to the tractor's dedicated diagnostic socket.

2. 2

   System Scan

   Perform a complete scan of all electronic systems (e.g., using the TGS3 function) to see if the A.1.4F error is currently active or stored.

3. 3

   Inspect the Hydraulic Valve Bus

   Access the wiring diagram through your diagnostic tool to identify all components electrically connected to Spool Valve 4 (Y018).

4. 4

   Inspect Wiring and Connections

   Physically inspect the wiring harness, pins, and connectors between the A002 E-box and Valve 4 for corrosion, breaks, or shorts that would interrupt the PWM signal or CAN communication.

5. 5

   Test the Valve Actuation Module

   If the wiring is intact, check the valve actuation electronics for common failure symptoms: operation no longer possible, failure to react to the float position, or sporadic blocking.

6. 6

   Repair or Replace

   If the electronics in the valve are faulty, remove the valve actuation module and either send it to a specialized agricultural electronics repair facility or replace the valve assembly entirely.

7. 7

   Clear Codes and Calibrate

   After repairing or replacing the valve, clear the fault codes from the A002 E-box and perform any necessary End-Of-Line (EOL) programming or valve calibrations to register the new component on the CAN bus.