Fendt 4.1.E1 – A002 - ECU, enhanced control (Comfort ECU / E-Box): Pressure regulator control parameters in tractive power control (ML transmission adjustment) not plausible or read incorrectly

Indicates a parameter or read error within the tractive power control system.

• 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 Vario series
• Favorit 700 Vario series
• 800 Vario series
• 900 Vario series (e.g., COM II and COM III generations)

1. 1

   Check Basic Signal Voltage: Verify the basic signal voltage supplied by the A002 E-Box. The A002 Comfort ECU should output a basic signal voltage (U1) of approximately 8.0 V. Measure the signal voltage at the corresponding pins (Pin 2 and Pin 1).

2. 2

   Check CAN Bus Communication: Ensure there are no underlying CAN bus communication faults restricting data to the E-Box.

3. 3

   Verify EEPROM Integrity: Check if the tractor is operating in a restricted emergency mode, which is common when the E-Box cannot read the transmission adjustment parameters.

1. 1

   Connect Diagnostic Tool

   Connect the FENDIAS diagnostic system or Fendt-EST to the tractor's diagnostic port.

2. 2

   Perform EOL Programming

   Run a new EOL (End-Of-Line) programming to rewrite and recalibrate the pressure regulator control parameters for the ML transmission adjustment.

3. 3

   Test and Calibrate

   After EOL programming, clear the fault codes and test the tractive power control functions to ensure the parameters are now reading as plausible.

4. 4

   E-Box Repair/Replacement (If EOL Fails)

   If the E-Box fails to accept the EOL programming (e.g., due to a permanent EEPROM hardware failure), the A002 E-Box must be removed and either sent to an agricultural electronics specialist for board-level repair or replaced entirely.