New Holland WorkMaster 50 Service Manual page 794

DTC 167-02-Open load error of injector in cylinder 1
Control Module : ECU
NOTE: If a fuel injector is replaced, it is necessary to program the new injector IMA code using the Electronic Service
Tool (EST). The IMA code may be under the paint on the fuel injector. For more information regarding programming
IMA codes, see Fuel injectors - Configure - IMA codes (10.218).
Context:
The Engine Control Unit (ECU) A-9000 monitors the fuel injector number 1 Y-9001 circuit. If the ECU A-9000 deter-
mines that there is an open circuit condition in the fuel injector number 1 Y-9001 circuit, this fault will occur.
Cause:
The ECU A-9000 has detected an open circuit in the fuel injector number 1 Y-9001 circuit.
Possible failure modes:
1. Faulty fuel injector number 1 Y-9001 wiring, open circuit.
2. Faulty fuel injector number 1 Y-9001, internal failure.
3. Faulty 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. Check fuel injector number 1 for an internal failure.
Disconnect the engine harness (EN) from fuel injector number 1 Y-9001 at connector X-9030.
Use a multimeter to perform the following resistance check on the fuel injector pins :
From
X-9030 pin 1
A. If the specified range is not measured, the fuel injector has failed. Replace the fuel injector number 1 Y-9001.
B. If the specified range is measured, leave connector X-9030 disconnected and continue to Step 3.
3. Check the fuel injector number 1 Y-9001 engine harness (EN) wiring for an open circuit.
Disconnect the engine harness (EN) from the ECU A-9000 at connector X-9001.
With they 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
X-9030 pin 2
A. If there is no continuity, there is an open circuit in the fuel injector number 1 Y-9001 engine harness (EN) wiring.
Locate and repair the broken conductor.
B. If there is continuity, check the ECU A-9000 for the appropriate software and re-flash, if necessary.
Electrical systems - FAULT CODES
To
X-9030 pin 2
To
X-9001 pin A16
X-9001 pin A32
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55.12 [55.DTC] / 73
Value
There should be approximately 0.3
- 0.5 Ω.
Value
There should be continuity.
There should be continuity.