Fendt 6.1.B5 – A004 - ECU, control panel: Speed selector button NEUTRAL. Communication fault

The system detects a signal or communication error with the Neutral PTO speed selection button, typically triggered if the button is pressed or physically stuck for more than 30 seconds. As a result, the PTO speed cannot be modified or selected, and the system may lock out the Neutral selection.

• 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 series
• Favorit 900 series
• 700 Vario COM III
• 800 Vario COM III
• 900 Vario COM III

1. 1

   Inspect the Neutral speed selector button on the A004 control panel for physical binding, sticking, or debris.

2. 2

   Verify the CAN bus communication and voltage supply to the A004 control console by checking the A013 fuse board, specifically fuses F040 and F041.

3. 3

   Check the wiring harness and connectors (referencing circuit diagram 'PTO's' Sheet 32) between the A004 control panel and the enhanced control ECU (A002) for continuity, corrosion, or damage.

4. 4

   Test if other PTO speeds (540, 750, 1000) can be selected or if the entire PTO selection is locked out to isolate whether the issue is the single button or the entire A004 communication bus.

1. 1

   Power Down

   Disconnect the tractor's battery before performing any electrical work or removing the console.

2. 2

   Free the Button

   If the button is simply stuck due to dirt or a spilled beverage, carefully clean the area around the switch with electrical contact cleaner and ensure it moves freely.

3. 3

   Button Replacement

   If mechanically broken and fused into the lower housing, carefully chisel or cut the old button out at the parting line. Install the new replacement button using a suitable plastic adhesive or superglue, ensuring the internal illumination function remains intact.

4. 4

   ECU Board Repair

   If the fault is internal to the A004 ECU circuit board, remove the entire A004 control console and send it to a specialized agricultural electronics repair center for board-level repair.

5. 5

   Reassembly & Clearing Codes

   Reinstall the console, reconnect the battery, and clear the fault codes using the FENDIAS diagnostic tool. Test the PTO neutral selection to confirm the repair.