New Holland T8010 Manual page 1633

Hand Throttle Idle Validation Switch Failure
Cause:
Hand Throttle idle validation switch failure.
Possible failure modes:
1. Switch Failed (shorted or open).
2. External wiring damage (shorted or open).
3. Bad connection (loose connector or bent pin).
4. Armrest controller has failed.
Solution:
Test the switch function, its wiring, and the function of the armrest controller.
1. Open the armrest controller housing and disconnect connector J208.
2. Check the wiring harness from the throttle control potentiometer to the armrest controller.
a) Check for the continuity from pin 4 and pin J, pin 5 to pin K, pin 6 to pin G. There should be good continuity.
b) Check for wiring damages, loose connectors, or bent pins.
3. Test the parameters of idle validation switch (the switch is an integrated part of the throttle control
potentiometer).
a) Push the hand throttle to LOW IDLE position. There should be continuity between pin 5 and pin 6 and no
continuity between pin 5 and pin 4.
b) Push the hand throttle to HIGH IDLE position. There should be continuity between pin 5 and pin 4 and no
continuity between pin 5 and pin 6.
c) When the throttle is in the position between LOW IDLE and HIGH IDLE, there should be no continuity
between pin 4, pin 5 and pin 6.
If the switch does not function as specified in above, replace the throttle control potentiometer.
4. Check the power supply from the controller:
a) Turn tractor key switch to the ACC position.
b) Test the switch power supply at pin 5 or pin K. It should be approximately 12 volts.
5. If no problem is found in the above tests, connect the potentiometer to the controller and check the function
again. If the throttle function is still not working well and the fault code is recorded again, replace the armrest
controller.
NOTE: See schematic section 46 on schematic poster.
Section 55 - Electrical System, Controller - Chapter 5
FAULT CODE ARM 1109
55-5-28