New Holland WorkMaster 50 Service Manual page 860

From
X-9127 pin 1
A. If the specified values are not measured, there is a short to battery in the PM catalytic converter inlet tempera-
ture sensor B-9127 wiring. Use the appropriate service manual, if necessary, to locate and repair the shorted
conductor.
B. If the specified values are measured, leave connector X-9127 disconnected and continue to Step 4.
4. Check the PM catalytic converter inlet temperature sensor B-9127 vehicle harness (VE) wiring for an open circuit
condition.
Disconnect the vehicle harness 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 2
X-9127 pin 1
A. If there is no continuity, there is an open circuit in the PM catalytic converter 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 connectors X-9102 and X-9127 disconnected and continue to Step 5.
5. Check the PM catalytic converter 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 K83
X-9102 pin K84
X-9127 pin 2
X-9127 pin 1
A. If there is continuity, there is a short circuit in the PM catalytic converter inlet temperature sensor B-9127 ve-
hicle 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
Chassis ground
To
X-9102 pin K83
X-9102 pin K84
To
All pins in connector X-9102
All pins in connector X-9102
X-9127 pin 1
Chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 139
Value
There should be less than 5.5 V
Value
There should be continuity.
There should be continuity.
Value
There should be no continuity.
There should be no continuity.
There should be no continuity.
There should be no continuity.