New Holland WorkMaster 50 Service Manual page 996

A. If there is no continuity or voltage, leave connector X-9123 and connector X-9102 disconnected and continue
to Step 3.
B. If there is continuity or voltage, there is a short circuit condition is in the lambda sensor B-9123 wiring in the
vehicle harness (VE). Use the appropriate vehicle service manual, if necessary, to locate and repair the dam-
aged conductors.
3. Check the Lambda sensor B-9123 virtual ground circuit wiring for an open circuit condition.
With the key in the OFF position, use a multimeter to check for continuity on the vehicle harness (VE) side :
From
X-9123 pin 2
A. If there is no continuity, there is an open circuit condition in the vehicle harness (VE) between connector X-9123
pin 2 and X-9102 pin K85.Use the appropriate service manual, if necessary, to locate and repair the broken
conductor.
B. If there is continuity, leave connector X-9123 disconnected and continue to Step 4.
4. Replace the Lambda sensor B-9123.
Use the EST, see Lambda sensor - Configure - Reset ECU data (Lambda sensor) (55.989) if necessary, to
perform the Replacement of the Lambda Sensor - Reset ECU Data.
Use EST to check to see that this fault has been resolved.
A. If the fault has been resolved, return the machine to service.
B. If this fault has not been resolved, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
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 K85
47866583_ 02/12/2015
55.12 [55.DTC] / 275
Result
There should be continuity.