Instrumentation Display Symptom Based Faults - New Holland T8010 Manual

INSTRUMENTATION DISPLAY SYMPTOM BASED FAULTS

Instrumentation Display Will Not Illuminate When Key Is Turned On
Meaning:
The INST controller (display) is not to be powered or has failed.
Possible failure mode:
1. Failed cab power relay - engine will run after starting.
2. Failed controller power relay - engine will stop after starting.
3. Failed key switch - engine will stop after starting.
4. Fuse #37 failed or circuit from fuse to controller pin 2 of connector CN2 failed open.
5. Poor ground supply to Display pin 4 of connector CN2.
Background:
The key switch activates the cab power relay and the controller relay (#19) when the key is placed in the start and
run position. The cab power relay supplies battery power (switched power) to the controller relay (#19). Both relays
must be powered for the controllers to be powered.
NOTE: Both the cab power relay and the controller relay (TMF/ICU controller relay #19) must make a clicking
sound when the key is turned on.
Wiring information:
Instrumentation controller connector CN2-2<--->Fuse 37<--->255 (Controller relay #19) 255<--->138 (cab power
relay)
240<--->unswitched power
Corrective action:
STEP 1 - Cycle key switch - (20 times)
Turn the front wiper on.
Turn the key switch on and off while monitoring the display and the front wiper, the display and front wiper must turn
on and off everytime when the key is cycled.
-- OK - The display and front wiper turned on every time when key switch was turned on.
-- NOT OK - The wiper turned on but the display did not turn on when the key was turned on. Go to Step 4.
-- NOT OK - The display and the wiper did not turn on, go to Step 2.
STEP 2 - Check power to cab power relay
The cab power relay is located in the fuse compartment behind the operator seat.
Turn the key on, the relay should make a clicking sound.
-- OK - Relay clicks, but wiper did not turn on - Replace relay (failed contacts).
-- NOT OK - Relay did not click - Check power supply to relay. Go to Step 3.
STEP 3 - Check power and ground to the cab power relay
Check relay ground - correct if needed.
Turn key on.
Check for relay coil power at ring terminal 138 for switched power from the key switch.
-- OK - Replace relay
-- NOT OK - Failed key switch
No power to key switch
Failed wire from the key switch to relay
STEP 4 - Check fuse 37
With the key switch on the display will not illuminate.
Check fuse 37.
-- OK - Go to Step 5.
-- NOT OK - Replace fuse, If fuse fails when key is turned on, go to Step 9.
Section 55 - Electrical System, Controller - Chapter 6
No Fault Code
55-6-17