So a couple of the guys on here have been super patient with me and have been helping me run down some issues with my truck in another thread, but because of the title I figured anyone who has had these same issues wouldn't think to look into that particular thread. Now there's some good information in that thread so I'll add the link to it at the end of this post, but I'll run down my issues first.

My truck has been getting the code P0102 ever since my truck broke down a while back (Novemberish of 2010). Shop replaced the PCM thinking my programmer had "fried" it and that did fix the truck but never got rid of that one code. Truck broke down again about a month and a half ago and they installed a new PCM along with a HPOP and when I got it back this time, it ran really sluggish and the P0102 code was still there. The PCM they replaced the truck with was running extremely high boost and it had 0 power. So one day for the hell of it, I put my original computer back in that I had saved and all issues went away and the truck ran awesome. Then a few days ago I went to crank it up after it had sat all night and it sounded very different once it fired, and the boost has been runing normal, but I can tell that it's dumping every bit builds out of the air box (does the turbo fart every time I let off the throttle, no matter how gradual I do it). After running down a few other possible causes, I've gotten it to where it throws absolutely no code except for the "P0102 - MAF sensor curcuit low input" code. Here's some info that might help:

MAF pin #1 --> PCM pin #33
MAF pin #2 --> 12V Power
MAF pin #3 --> Ground
MAF pin #4 --> PCM pin #21
MAF pin #5 --> PCM pin #42
MAF pin #6 --> PCM pin #43

MAF pin #1 --> Signal return
MAF pin #2 --> 12V Power
MAF pin #3 --> Ground
MAF pin #4 --> Mass Air Flow (MAF) sensor (12B579), signal, return
MAF pin #5 --> Mass Air Flow (MAF) sensor (12B579), signal
MAF pin #6 --> Intake air temperature sensor, signal

Images of these schematics can be found on page 3 of the original thread that will be posted below.

So basically it's coming down to 1 main question...Does the symptoms I have described even sound like something the MAF sensor not reading can cause? I believe so based on what the other guys have told me, but I figure there's no such thing as too many (reputable) opinions.

Is there anyone else who knows, based on the information given and the information available on the old thread where I should focus my search? My voltage readings at idle are posted I think on page 8 of the old thread, or maybe page 7.

The link is https://www.ford-trucks.com/forums/1...-symptoms.html

Thanks for any addition help, and hopefuly Blade35, dchamberlain, and npccpartsman, and any other former supporters can find their way over here.

 

Andy.....

you need to look into circuit 361. we have had more the one issue with that circuit. check near the splice.
load test each and every circuit on the maf using a high beam lamp.
check each circuit for shorts to power, shorts to ground. and shorted to other wires on that system.
issues comming from v.ref, sig return or 12v on 361 can cause a buch of random problems and this is one case were 2 trucks may not act alike.


or


take it back to Bill.

 

Haha as tempting as Bill sounds, I think I wanna look more into this circuit myself. But I know nothing about the circuit you're talking about, what is circuit 361?

 

refer back to thew diagram you listed it clearly shows the circuit to the splice

 

Ok I'll give it a look. Do you know if it's the color PDF diagram or the black and white diagram?

 

its the b&w one andy but the colors are listed on there in spite of the lack of color.

 

Ok I'll give it a look tomorrow.

 

I give up! I'm dropping it off at Ford in the morning. I didn't have time to try and get all that crap out of the way to be able to see the wires so I just got pissed off and scheduled a time to bring it in.

 

Oh and for reference from the other thread...the IAT sensor that my Insight monitors has to be the MAF sensor and not the manifold sensor, because when my temps got up to their operating temperature today, my IAT reading was 88 degrees while moving, and would slowly climb while at an idle.

 

What the hell?! Just talked to Ford a littler earlier...MAF sensor is good, no broken or messed up wiring, MAP sensor is good, all pins on harnesses are good, PCM pins are good...everything looks awesome! They're baffled as to why it's not working! They said they still had some stuff to look into and it's not throwing a VGT code and MAP code, and they're going to check into the VGT sensor. But they can't figure out where the MAF and MAP codes are coming from because the wiring and sensors are completely fine!

 

andy..
I gonna say this one last time.
LOAD TEST THE CIRCUITS WITH A HIGH BEAM LAMP.

 

Man, I am sorry to keep on hearing about your problems! I hope you figure them out..

I would listen to Cheezit

 

Is this something you made up out of a headlight

do you just ground the headlight and pull the load +pos thru the wire your trying to test off the battery thru the wire in ?? to headlamp

 

I have covered this a bunch..
but here we go.
use a high beam lamp, one end goes to ground and use the circuit that you need to test to go to B+. its simple and it works. just have to know how to isolate a circuit.

 

thanks cheezit

I assume you want to see a nice bright light

any dim or flicker or no light at all would be bad