New Holland T8010 Manual page 1592

Communication lost with the instrumentation controller
Cause:
Communication lost between transmission controller and instrumentation controller.
Possible Failure modes:
1. Bad Can Bus connection between the transmission controller and instrumentation controller.
2. Controller failure.
Solution:
Make sure both the transmission controller and instrumentation controller are functioning OK.
Check the Data Bus connections.
1. Check the function of the transmission controller:
Make sure there is no other fault code or symptom indicating transmission controller malfunctioning.
2. Check the function of the Instrument controller:
A. If there is no display and no back light on the tractor instrumentation, it is more likely that there is no power
to controller. Check power supply, its fuse, and the ground to the controller. Make sure the connector
(C061) to the Instrument controller is plugged in.
B. If there is display on the tractor instrumentation but the display is erratic, such as totally strange symbols,
and other controllers claim communication lost with the Instrument controller, it is more like the Instrument
controller failed. Replace the controller.
C. If nothing wrong can be found with the Instrument controller, go to step 3.
3. Check the power supply to the Tractor Data Bus.
A. Check fuse #42.
B. Turn the tractor key switch to the ON position. Verify approximately 12 volts power at fuse #42. If no power,
check the power supply to the key switch power stud.
4. Check the Tractor Data Bus at the can bus resistor terminators.
The following checks are performed looking into one end of the data bus and checking the resistor terminator
at the other end.
A. Check from the can bus resistor terminator at the engine. Raise the tractor hood. The resistor terminator is
located in harness that leads into Buss box. Disconnect the terminator plug at connector C205. With the
key switch in the ON position, measure the voltage on each pin to ground on connector C205.
At cavity A, the yellow wire, it should read from 2.5 to 2.8 volts.
At cavity B, the green wire, it should read from 2.2 to 2.5 volts.
If the above checks are ok and all controllers came online, it means that the opposite end resistor
terminator and the data bus wiring are functioning correctly. The engine end resistor terminator has most
likely failed. Test the engine end resistor terminator and replace if it has failed.
B. Check from the can bus resistor terminator in the AUX/Hitch/PTO controller.
Reconnect the engine end resistor terminator and disconnect the AUX/Hitch/PTO controller connector
C053.
With the key switch to OFF, then to ON. Measure the voltage between the following cavities at connector
C053.
At cavity 15, the yellow wire, it should read from 2.5 to 2.8 volts.
At cavity 16, the green wire, it should read from 2.2 to 2.5 volts.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 136
55-4-65