New Holland WorkMaster 50 Service Manual page 868

B. If there is no voltage, leave the main relay K-9102 disconnected and continue to Step 4.
4. Check the main relay K-9102 vehicle harness (VE) wiring for a short to ground.
With the key in the OFF position, use a multimeter to perform the following continuity check for a short to ground
on the vehicle harness (VE) side :
From
X-9129 pin 85
NOTE: Wiggle the harness during the check to promote an intermittent electrical connection.
A. If there is continuity, there is a short to ground in the main relay K-9102 wiring in the vehicle harness (VE). Use
the appropriate service manual, if necessary, to locate and repair the broken or damaged conductor.
B. If there is no continuity, leave the main relay K-9102 disconnected and continue to Step 5.
5. Check the main relay K-9102 vehicle harness (VE) wiring for an open circuit.
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 for an open circuit on
the vehicle harness (VE) side :
From
X-9129 pin 85
NOTE: Wiggle the harness during the check to promote an intermittent electrical connection.
A. If there is no continuity, there is an open 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 broken or damaged conductor.
B. If there is continuity, leave the main relay K-9102 and connector X-9102 disconnected, then continue to Step 6.
6. Check the main relay K-9102 wiring for a short circuit condition.
With the key in the OFF position, use a multimeter to perform the following continuity checks for a short circuit on
the vehicle harness (VE) side :
From
X-9129 pin 85
X-9102 pin K28
NOTE: Wiggle the harness during the check to promote an intermittent electrical connection.
A. If there is continuity, there is a short circuit in the main relay K-9102 vehicle harness (VE) wiring. 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 7.
7. Check the main relay K-9102 load-side wiring.
With the key in the ON position, use a multimeter to perform the following voltage checks on the vehicle harness
(VE) side :
From
X-9129 pin 86
X-9129 pin 30
NOTE: Wiggle the harness during the check to promote an intermittent electrical connection.
A. If there is not approximately 12.0 V, there is a failure in the main relay K-9102 load-side wiring. Use the appro-
priate service manual, if necessary, to locate and repair the shorted conductor.
B. If there is approximately 12.0 V, leave the main relay K-9102 and connector X-9102 disconnected, then con-
tinue to Step 8.
Electrical systems - FAULT CODES
To
Chassis ground
To
X-9102 pin K28
To
X-9129 pin 86
All pins in connector X-9102
To
Chassis ground
Chassis ground
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55.12 [55.DTC] / 147
Value
There should be no continuity.
Value
There should be continuity.
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.