New Holland T8010 Manual page 1431

4. Use a multimeter to check the resistance on both can bus resistor terminators. The resistance at AUX/Hitch/
PTO controller connector C053 from pin 15 to 16 should be 120 ohms. The resistance at the engine end
resistor terminator plug pin 1 to 2 should also be 120 ohms.
5. Split the Data Bus by disconnecting connector C333. Turn the key switch to OFF, then to ON.
A. If none of the controllers come back on line, the problem is inside the cab. Check the Data bus wiring in
the cab for open circuits or shorts to ground. If the problem cannot be found in the wiring, disconnect each
controller one at a time to determine if one of the controllers has failed.
B. If all of the controllers except the engine controller come back online, the problem is the Data Bus external
to the cab. Check the Data bus wiring outside of the cab for open circuits or shorts to ground. The Data
bus can be split once again at connector C060 to determine which portion of the exterior Data bus wiring
has the problem. If the problem cannot be found in the wiring, disconnect the engine controller to
determine if it has failed.
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting the Data Bus.
One intermittent connection can cause the entire bus to stop communications.
NOTE: Also see the Tractor Data Bus schematic foldout on the schematic poster.
NOTE: See schematic sections 24 through 26 and sections 55 through 58 on the schematic poster.
NOTE: See schematic section 51 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
55-3-12