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!
hi All, i am working a Isuzu NQR500 with 4hk 4 cyl diesel engine with intermittent cutting out, no dtc's on driving on ramp in shop we did wiggle test while scoping crank sensor by sensor connector, it dropped away once and not again. please review pattern and let me know your thoughts as it seems to have funny voltage and not as expected pattern. still learning a lot but enjoying it! total voltage meassured is 4.96v
Can’t pull it up on my phone, but is it a complete stall?
Here’s what I would do...
Scope current on injectors.
Scope a 5v ref. And scope your inputs responsible for firing the injectors. Capture what happens in the time it cuts out. That will give you major direction.
Is the crank sensor on this a VRS or Hall effect?
If Hall effect pull up or pull down?
Making Pressure Differential Sensors (PDA Sensors) for pressure pulse diagnostics.
Currently servicing Central Texas.
