Aux/Hitch/Pto Fault Code 24 - New Holland T8010 Manual

Communication Lost With The Instrument Controller
Cause:
The AUX/Hitch/PTO controller is not receiving or recognizing information from the instrumentation controller.
Possible failure codes:
1. Bad connection between AUX/Hitch/PTO controller and the instrument controller.
2. Controller failure.
Solution:
Make sure both the instrument controller and the AUX/Hitch/PTO controller functioning OK.
Check the Data Bus connections.
1. Check the function of the AUX/Hitch/PTO controller.
a) Make sure the connectors to the AUX/Hitch/PTO controller are plugged in.
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 connectors CN-1
and CN-2 are properly connected at instrument controller.
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 likely that the instrument
controller has failed. Replace the controller.
c) If nothing can be found wrong with the instrument controller, go to step 3.
3. Check the power supply to the Data Bus.
The power supply to the Data Bus is from the switched power through Fuse #42.
a) Make sure Fuse #42 is not burned out.
b) Turn the tractor Key 'ON'. Check the power supply at Fuse #42. There should be 12 volts.
If not, check the power supply from the switched power.
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. See step 5.
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.
See step 5.
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 3

AUX/HITCH/PTO FAULT CODE 24

55-3-21