Fendt 4.1.85 – Transmission Control Module (TCU / E-Box): B010 - Engine speed Hall sensor 1

The engine speed sensor does not supply plausible speed curves. The indicated engine output speed increase or decrease is outside the set limits.

• 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
• 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
• Favorit 700 and 900 series
• 300 Vario
• 400 Vario
• 700 Vario
• 800 Vario
• 900 Vario (including COM III generations)

1. 1

   Check for a 12V power supply fault at the A013 fuse board, fuse 4.

2. 2

   Inspect the sensor's electrical connector (e.g., X159) and wiring harness for corrosion, backed-out pins, or wire chafing.

3. 3

   Test the sensor signal using a multimeter or oscilloscope to verify it produces a consistent square-wave voltage pulse as the exciter wheel passes the sensor tip.

4. 4

   Ensure the sensor tip is clean and that the air gap between the sensor and the exciter gear is correct and free of metallic debris.

1. 1

   Power Down

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Sensor

   Locate the B010 Engine Speed Hall Sensor 1 (typically mounted on the engine block near the flywheel/crankshaft or camshaft area, depending on the specific engine model).

3. 3

   Remove the Faulty Sensor

   Disconnect the electrical connector (e.g., X159). Remove the retaining bolt and carefully pull the sensor out of its bore.

4. 4

   Install the New Sensor

   Clean the mounting surface. Insert the new sensor, ensuring it sits flush, and tighten the retaining bolt. Reconnect the wiring harness.

5. 5

   Calibrate the Sensor

   Run the specific calibration procedure for the B010 engine speed sensor using the tractor's onboard terminal or the FENDIAS diagnostic tool before returning the tractor to work.

6. 6

   Clear Codes

   Clear the 4.1.85 stored fault code from the Transmission Control Module and test drive the tractor to ensure the load limit control operates smoothly.