Fendt 4.1.07 – Transmission Control Unit (TCU): Transmission drive pressure high-pressure sensor — Signal fault (or Signal failure)

The system has detected a signal failure from the B008 sensor, which monitors the oil pressure in the transmission's high-pressure circuit. Because the peak loads in the transmission are no longer being monitored, the Tractor Management System (TMS) is switched off. Shifting between driving modes/operating ranges (from 1 to 2) is not possible.

• 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
• Fendt Farmer 400 series
• Fendt Favorit 700 series
• Fendt Favorit 900 series
• Fendt 300 Vario
• Fendt 400 Vario
• Fendt 700 Vario
• Fendt 800 Vario
• Fendt 900 Vario
• 309-312 Vario
• 409-412 Vario
• 711-718 Vario
• 815-818 Vario
• 916-936 Vario

1. 1

   Check A013 fuse 3 for an 8.5 V power supply fault

2. 2

   Locate the B008 high-pressure sensor on the right side of the transmission, on the valve block (requires removing the right rear wheel and covering metal panels)

3. 3

   Inspect the wiring harness and separation point/connector X157 for the B008 sensor for corrosion, damage, or loose connections

4. 4

   Test the B008 sensor output voltage/current draw with the engine running above 1400 rpm (Expected: 0 bar = ~0.80 VDC / 4.0 mADC, 30 bar = ~0.94 VDC / 4.7 mADC, 100 bar = 1.37 VDC / 6.7 mADC, 200 bar = 1.90 VDC / 9.2 mADC, 400 bar = 3.00 VDC / 14.8 mADC, 560 bar = 3.80 VDC / 18.7 mADC)

1. 1

   Preparation

   Safely park the tractor, turn off the ignition, and engage the parking brake.

2. 2

   Access the Valve Block

   Remove the right rear wheel and the metal shielding panels to expose the right side of the transmission valve block.

3. 3

   Electrical Repair

   If A013 fuse 3 is blown, replace it. If the wiring at connector X157 is damaged, repair the harness.

4. 4

   Sensor Replacement

   If the wiring and fuse are intact but the sensor fails the voltage/pressure test, depressurize the system and unscrew the B008 high-pressure sensor from the valve block. Install the new sensor and torque to OEM specifications.

5. 5

   Calibration

   Run the tractor's transmission calibration procedure via the Variotronic terminal after replacement.

6. 6

   Reassembly

   Reinstall the metal panels and the right rear wheel. Clear the fault codes from the tractor's memory.