New Holland WorkMaster 50 Service Manual page 792

DTC 163-03-Short circuit of low side to high source of injector in
cylinder 3
Control Module : ECU
Context:
The Engine Control Unit (ECU) A-9000 monitors the fuel injector power stages for a short circuit condition. If the ECU
A-9000 detects a short circuit condition in the injector number 3 Y-9003 circuit, this fault will occur.
Cause:
The ECU A-9000 has detected a short circuit between the high side driver and low side driver of the fuel injector
number 3 Y-9003.
Possible failure modes:
1. Faulty fuel injector number 3 Y-9003, wiring.
2. Faulty fuel injector number 3 Y-9003, internal failure.
3. Faulty ECU A-9000, software.
Solution:
1. Verify this fault code is still present and in an active state.
Use the Easy Engine software provided on the Electronic Service Tool (EST) to check the fault status and to
perform the cylinder cut-out test.
A. If the fault is still present and active, continue with Step 2.
B. If the fault is no longer present or is in an inactive state, the fault may be intermittent and not currently active.
Continue with Step 7.
2. Check the fuel injector number 3 Y-9003 internal resistance.
Disconnect the injector harness (INJ) from the fuel injector number 3 Y-9003 at connector X-9031.
Use a multimeter to measure the resistance of fuel injector number 3 Y-9003 on the injector pins :
From
X-9031 pin 1
A. If there is between .03 - .05 Ω, leave connector X-9031 disconnected and continue to Step 3.
B. If the resistance is not between .03 - .05 Ω, fuel injector number 3 Y-9003 solenoid coil has failed. Replace
fuel injector number 3 Y-9003.
3. Check the fuel injector number 3 Y-9003 injector harness (INJ) wiring.
Disconnect the vehicle harness (VE) from the engine interface at connector X-9139.
With the key in the OFF position, use a multimeter to perform the following continuity check on the injector harness
(INJ) side :
From
X-9031 pin 1
A. If there is no continuity, leave connectors X-9031 and X-9139 disconnected and continue to Step 4.
B. If there is continuity, there is a short circuit in the fuel injector number 3 Y-9003 wiring in the injector harness
(INJ) between wires INJ-270 and INJ-271. Locate and repair the shorted conductor.
4. Check the fuel injector number 3 Y-9003 vehicle harness (VE) wiring for a short circuit condition.
Electrical systems - FAULT CODES
To
X-9031 pin 2
To
X-9031 pin 2
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55.12 [55.DTC] / 71
Value
There should be between .03 - .05 Ω
Value
There should be no continuity.