New Holland WorkMaster 50 Service Manual page 801

DTC 173-03-Injection bank 2 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 fuel injector harness of both bank 2 fuel injections, this fault will occur.
The bank 2 fuel injectors are fuel injector number 2 Y-9002 and fuel injector number 3 Y-9003.
Cause:
The ECU A-9000 has detected a a short circuit pattern between both bank 2 fuel injectors.
Possible failure modes:
1. Faulty bank 2 fuel injector 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 2 and 3 harnesses for a short circuit condition.
Disconnect the engine harness (EN) from fuel injector number 2 Y-9002 at connector X-9032.
Disconnect the engine harness (EN) from fuel injector number 3 Y-9003 at connector X-9031.
With the key in the OFF position, use a multimeter to perform the following continuity check on the engine harness
(EN) side :
From
X-9032 pin 1
X-9032 pin 2
X-9032 pin 1
X-9032 pin 2
X-9032 pin 1
X-9031 pin 1
A. If there is continuity, there is a short circuit in the fuel injector bank 2 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.
Electrical systems - FAULT CODES
To
X-9031 pin 2
X-9031 pin 1
X-9031 pin 1
X-9031 pin 2
X-9032 pin 2
X-9031 pin 2
47866583_ 02/12/2015
55.12 [55.DTC] / 80
Value
There should be no continuity.
There should be no continuity.
There should be no continuity.
There should be no continuity.
There should be no continuity.
There should be no continuity.