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How to test Injector Failure?
Service engine light came on and engine runs rough. Pulled codes and came up with P1274, P1119, P0605. The last two are probably due to my Western Diesel tow chip, but the P1274 is cylinder 4 being out. Pulled the valve cover expecting to see the wire harness loose, but it is clipped tight. Started motor and injector #4 is not exhausting any oil, so code is correct.
Pulled the connector on the injector #4 and hooked up volt meter and reads 3DC volt or 7.5 AC with engine running
Does this mean the electric is fine and the injector solenoid is bad?
How do I test the solenoid?
What should the voltage be at the injector?
Is there anything else I should check?
Should I do an OHM test on the valve cover gasket connector?
The injector wire harness was replaced about two years ago and still looks new.
Could the Valve cover wire connector be bad and still read voltage at the connector?