New Holland T8010 Manual page 1540

Auto Guidance Isolation Valve Driver Fault
Cause:
The high side driver has detected an open circuit, or is in thermal shutdown (short circuit).
Possible failure mode:
1. Bad auto guidance solenoid.
2. Damaged wiring to auto guidance solenoid.
Solution:
1. Disconnect the auto guidance solenoid valve connector C074. Use a multimeter to check the resistance of the
coil. A good reading is 5 to 10 ohms. If the reading is out of range replace the coil. If the coil reading is okay
continue with step 2.
2. Check the wiring harness for an open circuit. Check from pin 2 on harness end of connector C074 to chassis
ground for continuity. If no continuity locate and repair open ground wire. Continuity okay, continue with step 3.
3. Disconnect transmission controller connector C0355 (at rear of cab). Check for continuity from harness end of
C355 pin 17 to pin 1 of C074. If no continuity, repair the open circuit.
4. If solenoid is okay and wiring is good, double check all electrical connectors and for damage to harness that
may cause intermittent fault.
Section 55 - Electrical System, Controller - Chapter 4
FAULT CODE TRANS 49
55-4-13