Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
I have an isuzu dmax 2009 series . all 4 injectors go back to the computer , Both the hot and pulse wire , but i am not getting any codes and i not getting any power or pulse on the injector connector . I don't know what to do and what could cause that . crankshaft senor change and no engine codes . so i'm lost . please help
Do you have spark? If not, and you aren’t getting injector pulse, you need to go to the 5v ref.
I would check for 5v ref at any sensor(pick the easiest to get to). Key on engine off, Use a 20 volt scale on a volt meter and use one lead on battery ground and check each wire going to the sensor and see if any read 5v. I don’t have diagram for that vehicle so I’m limited in what direction I can steer you in.
If you have 5v ref (some have multiple ref circuits) you would want to see if your crank signal is getting to the ecm.
If you don’t have 5v ref, you need to verify powers and grounds at the ecm. If everything is good there, then you need to determine if there is anything pulling down the reference voltage or if the ecm is just failing to produce it.
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
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