maf questions 94 b4000

[lfsgood]

36 views and no comments? anyone know what it means if i take + from meter to signal wire , - from meter to - on battery and I have 12 volts? Ive read I should have less then a volt and it should go up and down as engine is reved. is my pcm bent? thanks for any help

 

[adsm08]

I would post something helpful, but I don't understand the question. Wire colors might be helpful. Also, are you back-probing, or do you have the sensor unhooked? That will have huge effects on the results you get, but I am pretty sure that MAF sensors work on amperage, not voltage.

 

[lfsgood]

back probe

I would post something helpful, but I don't understand the question. Wire colors might be helpful. Also, are you back-probing, or do you have the sensor unhooked? That will have huge effects on the results you get, but I am pretty sure that MAF sensors work on amperage, not voltage.

yes Im back probing with the maf hooked up ,truck running the signal wire connected to positive side of meter, the neg from meter going to neg on battery, Im getting 12 volts and I believe I should only be getting around one. with truck warmed up when you rev up engine its suppose to go up then back down. my question is if its my maf oor my computer? I cant find anywhere info on ohms across maf ( unplugged ) thanks

 

[PanamaExpat]

yes Im back probing with the maf hooked up ,truck running the signal wire connected to positive side of meter, the neg from meter going to neg on battery, Im getting 12 volts and I believe I should only be getting around one. with truck warmed up when you rev up engine its suppose to go up then back down. my question is if its my maf oor my computer? I cant find anywhere info on ohms across maf ( unplugged ) thanks

Ohms across MAF unplugged isn't going to tell you much. Unless it has something to do with the first layer of circuitry directly connected to the plug. There is a lot of very complicated support circuitry inside the MAF itself. If one transistor or capacitor has failed or has a bad solder joint the MAF will become intermittent or fail completely. The only way to test to the best of my knowledge is the voltage variance test. If you are performing it correctly then you should be able to tell if the MAF is functioning or not. Why not simply grab another MAF from the junkyard and see if your results vary?