New Holland WorkMaster 50 Service Manual page 883

B. If the oil pressure switch S-9016 did not change state, leave connector X-9016 disconnected and continue with
Step 6.
4. Check the oil pressure switch S-9016 circuit for a short to ground condition.
With the key switch in the OFF position, use a multimeter to check for continuity on the engine harness (EN) side :
From
X-9016 pin 1
A. If there is continuity, leave connector X-9016 disconnected and continue with Step 5.
B. If there is no continuity, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
5. Locate the short to ground condition.
Carefully disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001.
With the key in the OFF position, use a multimeter to check for continuity on the engine harness (EN) side :
From
X-9001 pin A06
A. If there is continuity, the short to chassis ground condition is in the engine harness (EN) between connector
X-9001 pin A06 and connector X-9016 pin 1. Use the appropriate service manual, if necessary, to locate and
repair the grounded conductor.
B. If there is no continuity, the ECU A-9000 has failed internally, replace the ECU A-9000.
6. Check lubrication system for blockage.
See Engine lubrication system - Test (10.304), if necessary, to determine if the lubrication system has the ap-
propriate amount of oil pressure.
Between 0.6 - 0.9 bar (8.7 - 13.0 psi) is required to actuate the oil pressure switch S-9016.
There should be at least the minimum acceptable level of oil pressure.
A. If there is adequate oil pressure, the oil pressure switch S-9016 has failed internally replace the switch.
B. If there less than the minimum acceptable level of oil pressure, use the appropriate service manual, if neces-
sary, to locate and restore oil pressure to the lubrication system.
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 03 – Engine sensors and fuel injection (engine schematics)
(55.100.DP-C.20.E.03)
Electrical systems - FAULT CODES
To
chassis ground
To
chassis ground
47866583_ 02/12/2015
55.12 [55.DTC] / 162
Result
There should be no continuity.
Result
There should be no continuity.