New Holland WorkMaster 50 Service Manual page 938

4. Check the DOC inlet temperature sensor B-9127 vehicle harness (VE) wiring for an open circuit condition.
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102.
With the key in the OFF position, use a multimeter to perform the following continuity check on the vehicle harness
(VE) side :
From
X-9127 pin 1
X-9127 pin 2
A. If there is no continuity, there is an open circuit in the DOC inlet temperature sensor B-9127 vehicle harness
(VE) wiring. Use the appropriate service manual, if necessary, to locate and repair the broken conductor.
B. If there is continuity, leave connector X-9102 disconnected and continue to Step 5.
5. Check the DOC inlet temperature sensor B-9127 vehicle harness (VE) wiring for a short circuit condition.
With the key in the OFF position, use a multimeter to perform the following continuity check on the vehicle harness
(VE) side :
From
X-9102 pin K84
A. If there is continuity, there is a short circuit in the DOC inlet temperature sensor B-9127 vehicle harness (VE)
wiring. Use the appropriate service manual, if necessary, to locate and repair the shorted conductor.
B. If there is no continuity, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
6. Visually inspect the relevant harnesses and connectors for damage, bent or dislocated pins, corroded terminals,
or broken wires. Verify that the connectors are fully installed. Flex the harnesses involved to reveal intermittent
breaks or shorts in the wiring concerned. Operate the machine while you monitor the display.
A. If you find damage or the display indicates other than normal display readings, then repair the damage discov-
ered during the inspection or locate and repair the other than normal display condition and verify that the error
has been resolved.
B. If you do not find damage and the display indicates only normal readings, then erase the fault code and continue
operation.
Wiring harnesses - Electrical schematic sheet 02 – Engine Control Unit (ECU) power and after treatment
system (engine schematics) (55.100.DP-C.20.E.02)
Electrical systems - FAULT CODES
To
X-9102 pin K84
X-9102 pin K83
To
All pins in connector X-9102
47866583_ 02/12/2015
55.12 [55.DTC] / 217
Value
There should be continuity.
There should be continuity.
Value
There should be no continuity.