New Holland T8010 Manual page 1521

PTO Solenoid Circuit Shorted To Ground When PTO Is In Off State
Cause:
The AUX/Hitch/PTO controller has detected a short to ground at PTO solenoid, when PTO is in OFF state.
Possible failure mode:
1. The PTO clutch solenoid coil shorted to ground
2. PTO clutch solenoid wiring shorted to ground.
Solution:
Disconnect the PTO valve solenoid connector C159.
1. Check the wiring harness end pin 1 to ground. There should be no continuity to ground at this location with the
PTO switch in OFF position
2. Check the wiring harness end pin 2 to ground. There should be no continuity to ground at this location with the
PTO switch in OFF position.
3. If continuity to ground is recorded at either pin inspect the harness back to AUX/Hitch/PTO controller for source
of short to ground. If no short is located continue with next step.
NOTE: Always inspect connector ends for damage, bent or dislocated pins when troubleshooting.
Disconnect the connector C053 and C058 at the AUX/Hitch/PTO controller.
4. Check the AUX/Hitch/PTO controller connector C053 pin 13 to ground. There should be no continuity to
ground at this location with the PTO switch in OFF position
5. Check the AUX/Hitch/PTO controller connector C058 pin 7 to ground.
There should be no continuity to ground at this location with the PTO switch in OFF position.
6. If continuity to ground is traced to the controller connectors C053 pin 13 or C058 pin 7 when the PTO switch is
OFF, replace the AUX/Hitch/PTO controller.
7. If continuity to ground is recorded at AUX/Hitch/PTO connectors continue checking harness wiring from AUX/
Hitch/PTO controller to PTO solenoid for short to ground.
NOTE: See schematic section 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 173
55-3-102