So, I'm using the AEM FIC to tune my setup, and have a couple of questions. The FIC is unable to tune the MAF since ours is frequency based and the FIC tunes voltage based MAF sensors. Because of this, my car is currently running without use of the MAF (with a couple driving issues which i believe are related to this issue) Now, my question is this: Can i unplug the MAF from the FIC and reattach it again, completely bypassing the FIC and returning it the way it came? or will the MAF put me in limp mode if it sees boost pressures? I'm trying to solve the minor driveability issues associated with running without my MAF, but if it means i can't run boost, then its not worth it to me. Alternatively, if it would send me into limp mode, i can just get a trifecta tune to reprogram the ECM into seeing boost (along with removing my PE delay to make tuning easier). I just need to know what my options are.

no one knows? :(

What kind of probblems are you having im running the aem fic on car car now for 4 months now what codes are you having let me know and i will try to help you

well, a low MAF voltage input since it cant read (and i would assume cant write either) a frequency based signal...so basically im running without use of the MAF, and a crank sensor code...cant remember which one...along with my SAI code, but ive had that since i swapped headers.

I believe the easiest way to tune the car with the FIC is to simply voltage clamp the MAP and tune via narrowband for PE delay and use the built in map sensor while in boost.

MAF measures airmass not air pressure so boost has no effect on it until you overrun its airflow capacity.

damn man, where u been?

as for ur question, i have no clue /=

I believe the easiest way to tune the car with the FIC is to simply voltage clamp the MAP and tune via narrowband for PE delay and use the built in map sensor while in boost.

MAF measures airmass not air pressure so boost has no effect on it until you overrun its airflow capacity.

do you know what its airflow capacity would be though? I cant clamp the MAF either since its frequency based...

the reason you are getting that code P0120 is because the aem box does not send voltage to the pcm for the mass air flow during cranking

the reason you are getting that code P0120 is because the aem box does not send voltage to the pcm for the mass air flow during cranking

i dont think it does during any operation. I would imagine it sends a signal to the FIC, the FIC doesnt even see it since its not voltage based, and so the FIC doesnt send a voltage signal to the PCM...the FIC cant send frequency based MAF readings, and thats what it needs to do, so I'd say my best bet is bypassing the FIC and keeping the MAF line un-intercepted. Im just not sure if this will cause any problems.

i know that the aem is doing something for the maf because it took me a long time to tune my maf map on the aem when i was in boost because it kept on throwing p0068 code i belive i could only boost 4th gear but after hours of tuning i can boost in all the gears.

how are you tuning the MAF map at all? mine isnt reading anything but 0volts....it cant tune a frequency signal....

bump, this is the exact same problem I'm having, MAF reading is 0!

How did you get this to work misficcobalt?

Did you just not hook the MAF into the FIC?

bump, this is the exact same problem I'm having, MAF reading is 0!

How did you get this to work misficcobalt?

Did you just not hook the MAF into the FIC?

as far as getting it to start, just rev it up real high...i mean REAL high..like 4kRPM Even giving it a LOT of throttle for an idle, it will want to die on you and the RPMs will start to drop..if they do, floor it...you HAVE to keep the engine running for about 10 seconds. after 10 seconds, your traction control light will turn on, along with your CEL. At this point, the car is no longer referencing the MAF signal, and it will run fine. As long as you dont clear the code or disconnect the battery, you shouldnt have to do this again either, but the unmetered air will cause the car to misfire under high RPMs and high loading, but atleast you can drive it. Ive been driving like this now for about 1-2 months....kind of annoying, but Ive gotten used to it until I get a permanent fix.

Shit man, there is no way I'm doing that to my car. There has to be another way to get it to work...

how did you get around this misfitcobalt?

One last thing, are you sure you can't just run the FIC without the MAF hooked up?

I know you can convert a frequency signal to volts with the right calculations but that would be a serious pain in my ass sinceI bought the damn FIC on the basis that there website shows it's verified to work on our cars.

Does the SS use a voltage based MAF?

Shit man, there is no way I'm doing that to my car. There has to be another way to get it to work...

how did you get around this misfitcobalt?

One last thing, are you sure you can't just run the FIC without the MAF hooked up?

I know you can convert a frequency signal to volts with the right calculations but that would be a serious pain in my ass sinceI bought the damn FIC on the basis that there website shows it's verified to work on our cars.

Does the SS use a voltage based MAF?

as i said, its just a temporary fix. Ive got a wideband hooked up, and everything runs great even without the MAF signal. AFRs stay stoich at idle and light loading and in open loop AFRs range from low 13.5:1 to 11.8:1 based upon loading

Im going to try and run the FIC with the MAF bypassing it. The only issue then would be that a voltage clamp (or frequency clamp?) would still be needed for anything above atmospheric

as i said, its just a temporary fix. Ive got a wideband hooked up, and everything runs great even without the MAF signal. AFRs stay stoich at idle and light loading and in open loop AFRs range from low 13.5:1 to 11.8:1 based upon loading

Im going to try and run the FIC with the MAF bypassing it. The only issue then would be that a voltage clamp (or frequency clamp?) would still be needed for anything above atmospheric

I'm sure there can be something worked out easily enough. My only concern with running the FIC without the MAF was that it wouldn't know what to do with the rest of the the signals it was getting. However most of the tuning on our cars will be done with the MAP anyways.

I'll try bypassing the MAF this weekend and post up results.

I'll also look into something even as simple as a resistor soldered in line on the MAF frequency wire to block frequencies above a certain range.. I have a very basic knowledge of electronics to please don't laugh at me if there is no such thing.

Thanks.

sorry guys i been away for a while let me guess you have a code p0102 mass air flow low input voltage don't worry i have the same code i have the mass air flow chart all filled out and my car runs great it is because the map in the fic is controlling all the fuel delivery. i am going to figure out the mass air flow probblem but not untill this winter becasue i have to tear back into my harness and i don't want to do that right now because this is my daily driver. sucks though this weekend i put the ss fuel pump in my car and my byepass valve decide to take a shit.

sorry guys i been away for a while let me guess you have a code p0102 mass air flow low input voltage don't worry i have the same code i have the mass air flow chart all filled out and my car runs great it is because the map in the fic is controlling all the fuel delivery. i am going to figure out the mass air flow probblem but not untill this winter becasue i have to tear back into my harness and i don't want to do that right now because this is my daily driver. sucks though this weekend i put the ss fuel pump in my car and my byepass valve decide to take a shit.

theres no point at filling out the MAF map. The PCM wont be reading it....

The solution is to Tune Via the O2 not the MAF. I'm not even going to connect the MAF. The only function lost is the ability to Clamp the reading. No big deal at this point.

The solution is to Tune Via the O2 not the MAF. I'm not even going to connect the MAF. The only function lost is the ability to Clamp the reading. No big deal at this point.

im personally tuning through the MAP. Im getting a trifecta tune to remove PE delay, increase timing for 91 octane (since the FIC only retards timing), clamp the MAF at its highest stock value, and remove my SAI codes/emissions codes

I disconnected the MAF from the FIC and the car runs fine without it! I am now back on track for tuning!

good to know! ill have to do this myself now

The only thing about not having the MAF connected is now I won't be able to clamp the signal. However I can still skew the O2 and Clamp the MAP so the worst case I'll probably get a CEL. oh well I already have one.