New Holland T8010 Manual page 1513

The Software Has Not Detected PTO Shaft Speed For 3.6 Seconds Since The
PTO Initial Fill Valve Was Commanded
Cause:
The PTO controller monitors the PTO clutch output speed. This fault code is triggered if the PTO controller does
not detect PTO shaft rotation after engagement.
Possible failure mode:
1. PTO shaft locked up by the implement.
2. PTO solenoid is not energized or spool stuck in the OFF position.
3. PTO clutch pressure too low.
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 PTO clutch is not locked up by heavy implement load. If it is still not turning without heavy
implement load, check for PTO solenoid and PTO clutch problem. If it is turning, test the PTO speed sensor and its
wiring harness.
1. Turn off tractor engine. Check the implement connected to the PTO. Make sure the load is proper.
2. If the PTO shaft does not turn even without any implement load, check for sticking solenoid, sticking valve
spool, leaking clutch seal, burned clutch pad, or broken PTO shaft.
3. If the PTO shaft turns or it turns for 5 seconds when it is turned on and then stops, 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 164
55-3-94