New Holland 6005 – EMU: Both Diff Lock and Auto Diff Lock Switches Are Active

The control module is receiving conflicting signals simultaneously, indicating that both the manual differential lock switch and the auto differential lock switch are active. This is an illogical state that points to an electrical malfunction rather than a mechanical problem with the differential lock itself.

• TM115
• TM120
• TM125
• TM130
• TM135
• TM140
• TM150
• TM155
• TM165
• TM175
• TM190
• TS100
• TS110

1. 1

   Visually inspect the wiring harness and connectors leading to the differential lock switch for chafing, corrosion, or loose connections

2. 2

   Test the differential lock switch operation in all three positions (Manual ON, Neutral/OFF, AUTO) and note any unusual indicator light behavior

3. 3

   Perform continuity tests on the wiring between the switch and the EMU to check for open circuits

4. 4

   Test for short circuits between the manual and auto function wires, and check for shorts to ground

5. 5

   Test the differential lock switch itself to ensure it only sends a signal for the currently selected position

1. 1

   Isolate the Faulty Component

   Based on the diagnostic checks, determine if the issue lies with the switch, the wiring, or the control module.

2. 2

   Switch Replacement

   If the differential lock switch is found to be faulty, it should be replaced.

3. 3

   Wiring Repair

   If the wiring is damaged, repair or replace the affected section of the harness. Ensure all connections are clean and secure.

4. 4

   Control Module

   If the switch and wiring are confirmed to be in good working order, the issue may be with the Electronic Management Unit (EMU). Before replacing the EMU, it is advisable to consult a qualified New Holland technician, as the module may require programming.