New Holland T8010 Manual page 1612

The 3rd Remote Hydraulic Control Lever Potentiometer Failure
Cause:
The 3rd remote valve lever potentiometer has failed.
Possible failure modes:
1. Potentiometer shorted or open.
2. External wiring damage.
3. Loose connector, bent or partially inserted pin.
4. Controller failure.
Solution:
The 3rd remote hydraulic control lever potentiometer (AUX 3 lever) is hard wired to the armrest controller. The lever
position information is broadcast over the Data Bus. The remote hydraulic lever potentiometer function should be
checked out with the monitor screen of the service tool.
1. Open the armrest controller housing and disconnect connector J203 for the AUX 3 lever.
2. Test the 3rd remote hydraulic control lever potentiometer and its wiring. Pay attention for wiring damage, loose
connectors, or bent pins.
a) Measure the continuity between pin 3 (orange wire) and pin 5 (black wire). The resistance should be about
4 k ohms.
b) Measure between pin 4 (green wire) and pin 5 when moving the remote control lever from retract to extend.
The resistance should change continuously and smoothly.
If there is any problem with the potentiometer function, replace the remote control.
3. Check the power supply:
a) Turn tractor key switch to the ACC position.
b) Test the switch power supply from the armrest controller at pin 2 (red wire). It should be approximately 12
volts.
c) Test the potentiometer power supply from the armrest controller at pin 3 (orange wire). It should be
approximately 8 volts.
If no problem is found in above tests, go to the next step.
4. Connect the potentiometer from the 2nd or 4th remote control lever (J202 or J204) to the J203 in the controller.
Move the 2nd or 4th lever forward and backward and monitor the lever position in the monitor screen of the
service tool.
If the lever functions OK now, replace the 3rd remote hydraulic control.
If the lever still does not function well and the fault code can be recorded again, replace the armrest controller.
NOTE: You can directly use the test procedure in step 4 to troubleshoot: Connect the potentiometer from the 2nd
or 4th remote control lever (J202 or J204) to the J203 in the controller. Move the 2nd or 4th lever forward and
backward and monitor the lever position in the monitor screen. If the lever functions OK now, replace the 3rd
remote hydraulic control. If the lever still does not function well and the fault code can be recorded again, replace
the armrest controller, or connect the potentiometer from the 3rd remote control lever (J203) to the J202 or J204 in
the controller. Move the 3rd lever forward and backward and monitor the lever position in the monitor screen. If the
lever still does not function well and the fault code can be recorded again, replace the 3rd remote hydraulic control.
If the lever functions OK now, replace the armrest controller.
NOTE: See schematic section 45 on schematic poster.
Section 55 - Electrical System, Controller - Chapter 5
FAULT CODE ARM 49
55-5-7