Needing some pictures of a 5.7 hemi injector waveform

[Jatindall82]

2019 ram 1500
5.7 hemi
My mechanic is having trouble diagnosing a problem. Does anyone have some pictures of correct injector wave forms. He’s wanting to compare my truck to known correct wave forms. If anyone out there in this wonderful community has some please send me some HELP! lol

 

[kapinallinen2]

2019 ram 1500
5.7 hemi
My mechanic is having trouble diagnosing a problem. Does anyone have some pictures of correct injector wave forms. He’s wanting to compare my truck to known correct wave forms. If anyone out there in this wonderful community has some please send me some HELP! lol

Best I can do, resolution is abysmal but it is a textbook saturated switch waveform using a low side driver from PCM.

"The fuel injectors are electrical solenoids. The injector contains a pintle that closes off an orifice at the nozzle end. When electric current is supplied to the injector, the armature and needle move a short distance against a spring, allowing fuel to flow out the orifice. Because the fuel is under high pressure, a fine spray is developed in the shape of a pencil stream. The spraying action atomizes the fuel, adding it to the air entering the combustion chamber. An individual fuel injector is used for each individual cylinder. The top (fuel entry) end of the injector is attached into an opening on the fuel rail. The nozzle (outlet) ends of the injectors are positioned into openings in the intake manifold just above the intake valve ports of the cylinder head.


The Fuel Injectors are supplied voltage from the Automatic Shut Down (ASD) Relay Output circuit. The PCM controls the operation of the injectors through a Pulse Width Modulated (PWM) Low Side Driver (LSD). Each injector receives a unique pulse width based on that cylinder's fuel requirements. The PCM determines this fuel requirement by monitoring engine operating parameters through various sensors and then calculating the appropriate amount of fuel to be injected. The optimum amount of injected fuel depends on conditions such as engine and ambient temperatures, engine speed and workload, and exhaust gas composition"

 

[Jatindall82]

Thanks. We’ve had some misfires, found out some drivers were malfunctioning on my PCM. Sent it in and confirmed drivers bad. Diagnostic guy repaired the PCM it still has misfires. He’s done lots of testing and is almost sure it’s the injectors but not 100% so he wanted a known good waveform to compare to mine

 

[kapinallinen2]

I had an intermittent P0308 that happened on some cold starts in the morning, went on for couple months before I replaced the injector.

 

[Jatindall82]

I keep telling him let’s just replace the injectors but he wants to be 100% convinced before we do that

 

[bigdodge]

maybe @Jimmy07 can help.

 

[Cbty2050]

Find a new mechanic, if he isn't in diag.net, iatn, or in pico, snap, topdon(many other web sites) he isn't investing in himself. Not to metion the many of groups on facebook. You shouldn't need to do his leg work. Pico had a library with 1000s of waveforms, same as autonerdz