New Holland WorkMaster 50 Service Manual page 830

B. If the voltage is not present for one or more of the checks, see the appropriate vehicle service manual and
electrical schematics, if necessary, to locate and restore supply power to the ECU A-9000.
4. Determine the condition of the ECU A-9000 CAN circuit.
With the key switch in the OFF position, use a multimeter to measure the resistance of the CAN connection on the
vehicle (VE) harness side:
From
X-9102 pin K24
X-9102 pin K24
X-9102 pin K25
Use a multimeter to measure the resistance of the CAN termination resistor, internal to the ECU A-9000:
From
X-9102 pin K24
A. If the measured resistances are correct and neither conductor is grounded, check the ECU A-9000 for the
appropriate software and re-flash, if necessary.
B. If the measured resistances are not correct or one or both of the conductors is grounded, see the appropriate
vehicle service manual and electrical schematics, if necessary, to locate and restore the termination resistance
to the CAN circuit.
5. 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 K25
chassis ground
chassis ground
To
X-9102 pin K25
47866583_ 02/12/2015
55.12 [55.DTC] / 109
Value
There should be 120 Ω.
There should be no continuity
There should be no continuity
Value
There should be 120 Ω.