New Holland T8010 Manual page 1516

Current Sensed When PTO Driver Is Off
Cause:
When the PTO switch is OFF the controller should provide no voltage to the solenoid. If the controller senses
voltage on the circuit, this fault code is recorded.
Possible failure modes:
1. Damaged wiring resulting short to power.
2. Controller internal failure.
Solution:
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. If the switch checks out okay continue with the next step.
2. Check remote PTO switch function. Both switches are normally closed.
3. Check the wiring harness from the AUX/Hitch/PTO controller connector C053 pin 13 to ground.
There should be no shortage to 12 volt power at this location with the PTO switch in OFF position.
NOTE: Always inspect connector ends for damage, bent or dislocated pins when troubleshooting.
4. In any of the following two conditions, replace the controller.
a. No shortage to 12 volts is found in the circuit and there is no 12 V at any of the pins or cavities,
b. The 12 volts is traced to the controller connectors C053 pin 13 or C058 pin 7 when the PTO switch is OFF.
NOTE: See schematic section 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 167
55-3-97