Fendt 4.1.EF – A002 - ECU, Enhanced Control: Turboclutch characteristic — No calibration or drifted values

This fault indicates that the transmission's turboclutch function has lost its calibration parameters or the stored values have drifted outside of the acceptable tolerance range. The tractor will typically restrict itself to an auxiliary/emergency operating mode, though continuation of driving is usually 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
• 309 Vario
• 310 Vario
• 311 Vario
• 312 Vario
• 413 Vario
• 414 Vario
• 415 Vario
• 815 Vario
• 817 Vario
• 818 Vario
• 820 Vario
• 918 Vario

1. 1

   Verify the operation of the Y004 - Neutral/Turboclutch solenoid valve.

2. 2

   Check that when the Y004 solenoid valve is without current, the valve is open (power interrupted).

3. 3

   Check that when the Y004 solenoid valve has current, the valve is closed (transmission is nonpositive).

4. 4

   Ensure there are no CAN-bus communication errors to the A002 module by checking fuses F040 and F041 on fuse board A013.

1. 1

   Prepare for calibration

   Pull the hand brake tight. Warning: The tractor may start moving during this calibration process.

2. 2

   Start engine

   Start the engine.

3. 3

   Verify stationary state

   Ensure the tractor is completely stationary (speed must be less than 0.1 km/h).

4. 4

   Set engine speed

   Set and maintain the engine speed to 1100 +/- 40 rpm (note that engine speed may drop during the calibration process).

5. 5

   Initiate calibration

   Enter Calibration Code 4009 into the diagnostic terminal to initiate the turboclutch calibration.

6. 6

   Allow relearning

   Allow the A002 ECU to relearn the Y004 solenoid valve characteristics.

7. 7

   Perform EOL reprogramming if needed

   If the calibration fails repeatedly or the A002 ECU has an internal memory fault (RAM/EEPROM checksum error), an EOL (End of Line) reprogramming of the A002 ECU by an authorized dealer is necessary.