New Holland T8010 Manual page 1515

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PTO Driver Is On And No Current Is Sensed
Possible failure modes:
1. PTO solenoid coil failed.
2. Damaged wiring.
3. Loose connector or bent pin.
4. Controller internal failure.
Solution:
Check the PTO solenoid resistance and the wiring from the AUX/Hitch/PTO controller to the PTO solenoid.
1. Test the resistance of the PTO solenoid at the valve connector C159.
Disconnect connector C159.
Inspect pin 1 and pin 2 in the connector. Clean the connection.
Clean the mating pin and connector.
Visually inspect the harness between connector C159 and C053 pin 13 at the AUX/Hitch/PTO controller.
Next visually inspect the harness between connector C159 and C058 pin 7 at the AUX/Hitch/PTO controller.
Use a multimeter to check the continuity between connector C053 pin 13 and connector C159 pin 1.
Next use a multimeter to check the continuity between connector C058 pin 7 and connector C159 pin 2.
If no damage and continuity checks are good, measure across pin 1 and pin 2 at the PTO solenoid.
The resistance should be in the range of 6 to 13 ohms.
If the resistance is higher than 13 ohms, there is an open circuit in the solenoid coil.
If the resistance is less than 6 ohms, there is a shortage in the solenoid coil.
In either case, replace the solenoid on PTO solenoid.
If the resistance is within the specified range, replace or repair the harness between C159 and C053 and C058
at the AUX/Hitch/PTO controller.
NOTE: Always inspect connector ends for damage, bent or dislocated pins when troubleshooting.
2. Check the function of the AUX/Hitch/PTO controller.
Connect all connections. Make sure the controller has proper power and ground connection.
Turn the PTO ON, there should be about 12 volts at C053 pin 13.
If not, replace the AUX/Hitch/PTO controller.
NOTE: See schematic section 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 166
55-3-96

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