Fendt 9.1.B0 – Enhanced Control ECU (A002) or Multifunction Armrest (MFA / A039 / A100): B040 - Sensor, front power lift position: Not calibrated.

The tractor's system has lost the calibration values for the front linkage (front power lift) position sensor. As a direct consequence, the tractor disables automatic position control for the front power lift, though it may still be operable manually via external buttons.

• 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 series (409, 410, 411, 412)
• Favorit 700 & 900 series
• Fendt Vario series (300, 400, 700, 800, and 900 Vario models, including COM III and S4 generations)

1. 1

   Check Sensor Supply Voltage: Verify that 8.5 VDC is reaching the sensor (often routed through fuse board A013, fuse 11 or 12 depending on the model).

2. 2

   Check the Signal Line: Verify the signal wire back to the ECU. With the ignition on, the signal voltage should vary smoothly (typically between 0 VDC and 6.7 VDC) as the front lift is moved through its physical range.

3. 3

   Check Linkage Mechanics: Ensure the front linkage is not physically jammed and can reach its upper and lower end positions, which is required for a successful calibration.

1. 1

   Warm up the tractor

   Warm up the tractor (transmission oil temperature should ideally be above 40°C for general hydraulic calibrations, though front EPC can often be done independently).

2. 2

   Access diagnostic menu

   Access the tractor's terminal/diagnostic menu.

3. 3

   Enter Calibration Code

   Enter Calibration Code 9002 (Front EPC calibration / Front power lift position).

4. 4

   Calibrate limits

   Follow the on-screen prompts to teach the system the upper and lower limits of the front power lift.

5. 5

   Evaluate calibration and sensor

   If the calibration fails (e.g., throws a calibration fault code like F02 'Calibrated values are faulty'), or if the sensor voltage is erratic/dead, the B040 sensor is defective and must be replaced.

6. 6

   Replace and recalibrate

   Replace the sensor and repeat Calibration Code 9002. Any time a new position sensor is installed, it must be calibrated before the system will restore position control.