New Holland WorkMaster 50 Service Manual page 866

From
X-9102 pin K28
A. If there is continuity, there is a short circuit in the main relay K-9102 wiring in the vehicle harness (VE). Use the
appropriate service manual, if necessary, to locate and repair the shorted conductor.
B. If there is no continuity, leave the main relay K-9102 and connector X-9102 disconnected, then continue to
Step 5.
5. Check the ECU A-9000 voltage supply wiring for a short to a voltage source.
With the key in the OFF position, use a multimeter to perform the following voltage checks for a short to a voltage
source on the vehicle harness (VE) side :
From
X-9102 pin K01
X-9102 pin K03
X-9102 pin K05
A. If there is voltage, there is a short to a voltage source in the ECU A-9000 voltage supply wiring. Use the
appropriate service manual, if necessary, to locate and repair the shorted conductor.
B. If there is no voltage, leave the main relay K-9102 and connector X-9102 disconnected, then continue to Step
6.
6. Check the ECU A-9000 voltage supply wiring for a short to a voltage source.
Re-connect the main relay K-9102.
With the key in the OFF position, use a multimeter to perform the following voltage checks for a short to a voltage
source on the vehicle harness (VE) side :
From
X-9102 pin K01
X-9102 pin K03
X-9102 pin K05
A. If there is voltage, the main relay K-9102 has failed. Replace the main relay K-9102.
B. If there is no voltage, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
7. 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
All pins in connector X-9102
To
Chassis ground
Chassis ground
Chassis ground
To
Chassis ground
Chassis ground
Chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 145
Value
There should be no continuity.
Value
There should be no voltage.
There should be no voltage.
There should be no voltage.
Value
There should be no voltage.
There should be no voltage.
There should be no voltage.