New Holland WorkMaster 50 Service Manual page 800

DTC 171-03-Injection bank 1 short circuit failure (all injectors of
the same bank can be affected)
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the fuel injector harness for a short circuit condition. If the ECU
A-9000 detects a short circuit pattern in the bank 1 fuel injectors, this fault will occur. Fuel injector number 1 Y-9001
is the only fuel injector for bank 1.
Cause:
The ECU A-9000 has detected a a short circuit pattern in the bank 1 fuel injector harness.
Possible failure modes:
1. Faulty fuel injector bank 1 wiring, short circuit.
2. Fault ECU A-9000, software.
Solution:
1. Verify fault is present and active.
Use the Electronic Service Tool (EST) to check the status of this fault.
A. If the fault is present and active, continue with Step 2.
B. If the fault is no longer present or in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 4.
2. Use the Electronic Service Tool (EST) to check for other active faults that may have caused this fault to occur.
A. If any of the related faults are active, diagnose them first and then return to this fault.
B. If none of the related faults are active, continue to Step 3.
3. Check the fuel injector 1 Y-9001 harness for a short circuit condition.
Disconnect the engine harness (EN) from fuel injector number 1 Y-9001 at connector X-9030.
With the key in the OFF position, use a multimeter to perform the following continuity check on the engine harness
(EN) side :
From
X-9030 pin 1
A. If there is continuity, there is a short circuit in the fuel injector bank 1 harness. Locate and repair the shorted
conductor.
B. If there is no continuity, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
4. 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
X-9030 pin 2
47866583_ 02/12/2015
55.12 [55.DTC] / 79
Value
There should be no continuity.