New Holland WorkMaster 50 Service Manual page 783

With the key in the OFF position, use a multimeter to perform the following continuity check on engine harness
(EN) side :
From
X-9001 pin A16
X-9001 pin A32
A. If there is continuity, there is a short circuit in the fuel injector number 1 Y-9001 wiring in the engine harness
(EN). Locate and repair the shorted conductor.
B. If there is no continuity, continue with Step 5.
5. Check the ECU A-9000 voltage supply wiring.
Disconnect the vehicle harness (VE) from the ECU A-9000 at connector X-9102.
Place a jumper wire between X-9102 pin K28 and chassis ground. This will energize the main relay K-9102.
Use a multimeter to perform the following voltage checks on the engine harness (EN) side :
From
X-9102 pin K01
X-9102 pin K03
X-9102 pin K05
A. If there is not approximately 12.0 V, there is a faulty ECU A-9000 voltage supply. Use the appropriate service
manual, if necessary, to locate and repair the failed conductor.
B. If there is approximately 12.0 V, 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 01 – Power distribution and glow plugs (engine schematics)
(55.100.DP-C.20.E.01)
Wiring harnesses - Electrical schematic sheet 02 – Engine Control Unit (ECU) power and after treatment
system (engine schematics) (55.100.DP-C.20.E.02)
Wiring harnesses - Electrical schematic sheet 03 – Engine sensors and fuel injection (engine schematics)
(55.100.DP-C.20.E.03)
Electrical systems - FAULT CODES
To
All pins in connector X-9001
All pins in connector X-9001
To
X-9102 pin K02
X-9102 pin K04
X-9102 pin K06
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Value
There should be no continuity
There should be no continuity
Value
There should be approximately
12.0 V.
There should be approximately
12.0 V.
There should be approximately
12.0 V.