New Holland T8010 Manual page 1469

Auto Differential Switch is Faulty
Cause:
The Data Bus signaled that the Diff lock switch has failed.
The AUX/Hitch/PTO controller received the signal from the armrest controller.
Possible failure mode:
1. The diff lock switch failed in the armrest controller (in most cases).
2. Software execution error in the armrest controller (small chance).
Solution:
The Diff lock switch is hard wired to the armrest controller. If the Diff lock switch fails in the armrest controller, fault
code ARM 1079 should exist.
1. Check for fault code ARM 1079 at the armrest controller. If ARM 1079 exists, follow the corresponding
corrective action.
2. Check the function the armrest controller
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting.
NOTE: See schematic section 44 on the schematic poster.
Difflock Switch Failure
Cause:
The Data Bus signaled that the Diff lock switch has failed.
The AUX/Hitch/PTO controller received the signal from the armrest controller.
Possible failure mode:
1. The Diff lock switch failed in the armrest controller (in most cases).
2. Software execution error in the armrest controller (small chance).
Solution:
The Diff lock switch is hard wired to the armrest controller. If the difflock switch fails in the armrest controller, fault
code ARM 1079 should exist.
1. Check for fault code ARM 1079 at the armrest controller. If ARM 1079 exists, follow the corresponding
corrective action.
2. Check the function the armrest controller
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting.
NOTE: See schematic section 44 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 88
AUX/HITCH/PTO FAULT CODE 89
55-3-50