Fendt A.1.DB – Tractor Electronic System / Auxiliary Control Unit: Hydraulic oil tank characteristic implausible

The electronic signal coming from the hydraulic oil level sensor (S036 or B084) is out of its expected calibration range, resulting in an incorrect display of the hydraulic oil supply on the tractor's monitor.

• 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 series
• Fendt Favorit 700 and 900 series
• Fendt 300, 400, 700, 800, and 900 Vario (COM III generation)

1. 1

   Verify the actual physical hydraulic oil level in the tank to ensure it is not completely empty or severely overfilled.

2. 2

   Inspect the wiring harness and connector for the hydraulic oil level sensor (S036 / B084) for breaks or a disconnected plug.

3. 3

   Use the FENDIAS diagnostic tool to check for companion codes (e.g., A.1.D7 for a hard break, A.1.D9 for an empty tank).

1. 1

   Correct Fluid Levels

   Top up or drain the hydraulic oil to the correct specification as outlined in the maintenance schedule.

2. 2

   Repair Wiring

   If diagnostic checks reveal a short or break in the sensor wiring harness, repair the connection.

3. 3

   Replace Sensor

   If the wiring is intact but the signal remains implausible, replace the hydraulic oil level sensor (S036 / B084).

4. 4

   EOL Reprogramming

   Connect the FENDIAS diagnostic laptop and perform an End-of-Line (EOL) programming procedure to recalibrate the tank characteristics to the ECU so it can accurately read the sensor.