Fault Code Inst 12051 - New Holland T8010 Manual

Communication Lost With Aux/Hitch/PTO Controller
Cause:
Communication lost between the instrumentation controller and the Aux/Hitch/PTO controller.
Possible failure modes:
1. Bad connection between the instrumentation and Aux/Hitch/PTO controller.
2. Controller failure.
Solution:
Make sure both the Aux/Hitch/PTO controller and the instrumentation controller are functioning properly.
Check the Data Bus connections.
1. Check the function of the Aux/Hitch/PTO controller.
Make sure all connectors C053, C054, C055, C056, C057 and C058 are plugged in to the Aux/Hitch/PTO
controller.
2. 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.
3. Check the function of the instrument controller.
A. If there is no display and no back light on the tractor instrumentation, it is most likely that there is no power
to the controller. Check the power supply, its fuse and the ground to the controller. Make sure the
connectors CN-1 and CN-2 to the instrumentation controller are plugged in.
B. If there is a display on the tractor instrumentation but the display is erratic, such as unusual symbols, and
other controllers claim communication is lost with the instrument controller, it is most likely the instrument
controller has failed. Replace the instrument controller.
C. If the display is normal, go to number 3.
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.
If the above checks are ok and all controllers came online, it means that the engine end resistor
terminator and the data bus wiring are functioning correctly. The AUX/Hitch/PTO controller resistor
terminator has most likely failed. Test the AUX/Hitch/PTO resistor terminator and replace if it has failed.
5. Use a multimeter to check the resistance on both can bus resistor terminators. The resistance at AUX/Hitch/
PTO controller connector C053 from pin 15 to 16 should be 120 ohms. The resistance at the engine end
resistor terminator plug pin 1 to 2 should also be 120 ohms.
6. Split the Data Bus by disconnecting connector C333. Turn the key switch to OFF, then to ON.
Section 55 - Electrical System, Controller - Chapter 2

FAULT CODE INST 12051

55-2-17