New Holland T8010 Manual page 1518

Both PTO On And Off Switches Are Simultaneously Off, One of the PTO
Switches Is Shorted To Ground
Cause:
The PTO switches in armrest are both simultaneously off, one switch may be shorted to ground or a wire maybe
open. The PTO switch in armrest is hard wired to AUX/Hitch/PTO controller.
Possible failure mode:
1. The PTO on/off switch failed in the armrest controller (in most cases).
2. PTO switch wiring failure between the AUX/Hitch/PTO controller and the armrest controller (fair chance).
3. Software execution error in the armrest controller (small chance).
Background:
The PTO off/on switch is hard wired to the armrest controller and the AUX/Hitch/PTO controller.
Solution:
The PTO on/off switch is hard wired in the armrest controller and is hard wired to the AUX/Hitch/PTO controller.
1. Connect the service tool to the tractor Data Bus, do the following:
Go to the Monitor screen by click the Monitor Icon.
Click the CHANGE PARAMETER SELECTIONS Icon.
Click the PTO SWITCH and then ADD. Next click EXIT. You will now be able to monitor the PTO SWITCH
status on the screen.
Turn the switch on and off, and watch the status change.
If the status display matches the switch changes, the switch is working OK. If not, continue the test procedures.
If the service tool is not connected to the tractor Data Bus or the status display does not match the switch
changes, test the switch and its wiring. See step 2.
2. Check for continuity from main harness connector C137 pin 7 harness end to AUX/Hitch/PTO controller
connector C057 pin 30. If there is no continuity check for damage to harness. Check for continuity from both
C137 and C057 to connector C010 pin 29. Continuity from C137 to C010 would indicate the cab harness
portion is good.
3. If none of the above or the problem is intermittent, the switch may be contaminated internally or the wiring may
have started to deteriorate.
NOTE: See schematic sections 47, 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 169
55-3-99