New Holland T8010 Manual page 1512

PTO Is Commanded Off But The PTO Speed Is Greater Than Zero
Cause
The PTO controller monitors the PTO clutch output speed. This fault code is recorded if the PTO controller has
detected PTO shaft rotation when PTO is turned off for 45 seconds.
Possible failure mode:
1. The PTO brake not functioning.
2. The clutch is not really turned off.
3. Implement attached to tractor had caused the PTO to turn.
4. PTO speed sensor or its wiring harness failure.
PTO SHAFT SPEED SIGNAL
The PTO shaft speed frequency is derived from a variable reluctance speed sensor in the transmission. The clutch
speed sensor is connected directly to the AUX/Hitch/PTO control module. The sensor output is directly proportional
to PTO clutch output speed, and is a quasi-sinusoidal wave form the amplitude of which is non-linearly proportional
to speed. The amplitude range of the signal is from 3 volts peak-to-peak to 80 volts peak-to-peak centered around
chassis ground. Frequency range is from zero to 3,200 Hz worst case.
PTO SHAFT SIZE SPEED SIGNAL
The PTO shaft size speed frequency is derived from a variable reluctance speed sensor in the transmission. The
sensor is connected directly to the AUX/Hitch/PTO control module and its output is proportional to PTO clutch
output speed, but scaled differently from the PTO clutch speed signal depending upon which PTO shaft is in use;
i.e. 1-3/4" 1000 RPM, 1-3/8" 1000 RPM or 1-3/8" 540 RPM. The signal is a quasi-sinusoidal waveform the
amplitude of which is non-linearly proportional to speed. The amplitude range of the signal is from 3 volts peak-to-
peak to 80 volts peak-to-peak centered around chassis ground. Frequency range is from zero to 760 Hz worst
case.
Solution:
Make sure the Implement attached to tractor is not causing the PTO to turn. If the PTO is still turning when it is
turned off, check for PTO solenoid and PTO clutch problem. If it is not turning, test the PTO speed sensor and its
wiring harness.
1. Turn off tractor engine. Check the implement connected to the PTO. Make sure it is not causing the PTO to
turn.
2. If the PTO is still turning when it is turned off, check PTO clutch brake function, also check PTO valve for
sticking solenoid, sticking valve spool.
3. If the PTO shaft stops turning after it turned off and the fault code is still recorded, go to step 4 and 5.
4. Check the wiring harness to the PTO shaft speed sensor.
Check the continuity from Pin 20 of connector C058 to Pin A of connector C145.
Check the continuity from Pin B of connector C145 to the chassis ground.
5. Check the function of the PTO speed sensor. It should have resistance of about 3 K ohms.
NOTE: Always inspect connector ends for damaged, bent or dislocated pins when troubleshooting.
NOTE: See schematic sections 49 and 50 on the schematic poster.
Section 55 - Electrical System, Controller - Chapter 3
AUX/HITCH/PTO FAULT CODE 163
55-3-93