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Old 10-26-2009, 01:01 AM   #1 (permalink)
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Default low maf voltage
ok .... so i have changed the maf and still getting the same code. what would cause a low maf voltage? i have a fully built car with diablo mafia.. i have tried to remove the mafia and still will not start consistently. i dont know know what is wrong with my car. ihad this problem a while ago and dont know what i did that fixed it and now it is back? some help please...
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Old 10-26-2009, 01:21 AM   #2 (permalink)
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Default Re: low maf voltage
More details would be helpful. What are you tuning with? Have you data logged the maf? What size maf tube? Injectors? Ect....
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Old 10-26-2009, 07:58 AM   #3 (permalink)
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tuned with sct. by dan at pro dyno... 3in maf tube and 71lb injectors.
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Old 10-26-2009, 05:51 PM   #4 (permalink)
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Default Re: low maf voltage
^Assuming he knows what he's doing, what's the point of having a MAFia?


I'm going to also have to ask if the MAFia is hooked up right?
What voltage is low, Vref? (should be a constant 5V)
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Old 10-26-2009, 06:58 PM   #5 (permalink)
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Default Re: low maf voltage
i have not verified the maf voltage yet im gonna get out there tonight if i have time and check it.. and i thought there is only one way to hook up the mafia.. plus i am putting down over 400whp that is why we need the mafia...
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Old 10-26-2009, 07:32 PM   #6 (permalink)
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Default Re: low maf voltage
If this is still the same issue you were battling before, it would be better to bump the old thread so people know what has been tried and discussed.
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Old 10-26-2009, 08:09 PM   #7 (permalink)
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Default Re: low maf voltage
Correct me if I'm wrong, but if you are programmed to use a MAFia, and are trying to start the car without it, it won't. I believe you need you have it installed in order for that program to mean anything to the car as there are translation factors involved in the programming when using those.
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Old 10-26-2009, 09:37 PM   #8 (permalink)
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Default Re: low maf voltage
im not sure... but i went out and checked the voltage and i had a constant 4.97v both before the mafia and after.. got the car started again but it died and threw another p0102 low maf voltage. im gonna try a different maf and see if that works..

it is a problem that i had before and i really dont know what i did to fix it before.. i think i just changed the maf... ill try it again..
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Old 10-26-2009, 09:47 PM   #9 (permalink)
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Default Re: low maf voltage
often times when cars in general have a low voltage code on whatever 5v sensor you will find the sensor is unplugged or bad wiring...try un-plugging another sensor like the o2 or tps and see if a low voltage code pops up...if the car runs the same with the maf unplugged as it does plugged in it may have lost a wire and also use a datalogger or scanner to see if the maf has a signal reading or iat reading on the data list
best of luck
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Old 10-26-2009, 09:49 PM   #10 (permalink)
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Quote:
Originally Posted by FocusSportVP View Post
If this is still the same issue you were battling before, it would be better to bump the old thread so people know what has been tried and discussed.
Guess I should have looked into this a bit, lol.
Doing so I found these 2,
http://forums.focaljet.com/forced-in...f-voltage.html
http://forums.focaljet.com/forced-in...-if-u-fix.html


Really thinking this kid is in over his head . . .



Back to this last MAF thread,
Can you log MAF counts, G/sec?
If you can that's all you'll be able to log.

If you're looking for MAF voltage you'll have to manually probe the connector,



D+
B- should read 5 volts

F+
B- should be pretty stable, IAT voltage, will vary based on intake air temp, higher is hotter

C+
B- should be MAFS count and I'm assuming the one you're looking for

A+
B- should read battery voltage, 12 - 15 volts


Assuming you're thinking that you should be able to log something like this --> http://www.dainst.com/info/maf/ford_mustang_maf.html
That is no longer present in EEC-V, was in EEC-IV though. Basically it's just a name change but essentially the same thing.
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Old 10-27-2009, 07:55 AM   #11 (permalink)
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Default Re: low maf voltage
hmmm.... thats interesting.. mine does not do that...ill have to check it again and tell you what i get on all those... i think mine is in different places...
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Old 10-27-2009, 10:53 PM   #12 (permalink)
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Default Re: low maf voltage
ok logged the maf counts and voltage.. but found out with the mafia plugged in i cant log either but with the mafia unplugged at least i can log my counts and my counts are about 254 at idle....
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Old 10-27-2009, 11:33 PM   #13 (permalink)
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Default Re: low maf voltage
I'm dumb.
Last edited by Lancer211; 10-28-2009 at 12:41 AM. Reason: I'm dumb.
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Old 10-27-2009, 11:49 PM   #14 (permalink)
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Default Re: low maf voltage
And you understand why this is right?

If not maybe you should look into what the MAFia does . . .
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Old 10-28-2009, 12:19 AM   #15 (permalink)
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Default Re: low maf voltage
Quote:
Originally Posted by FordFociSHO View Post
And you understand why this is right?

If not maybe you should look into what the MAFia does . . .


I just facepalmed at myself.
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Old 10-28-2009, 03:05 PM   #16 (permalink)
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Quote:
Originally Posted by FordFociSHO View Post
And you understand why this is right?

If not maybe you should look into what the MAFia does . . .
are you talking to me? im confused... all i know is that i never had problems logging my maf counts before... i wish i could get a mafia to just try it and see if it fixes it real quick. plus it would allow me to go to the meet this weekend... if u are talking to me i know that the mafia effects the voltage and allows the stock maf to exceed the limits of its stock paramiters...
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Old 10-28-2009, 03:28 PM   #17 (permalink)
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Default Re: low maf voltage
I don't have problems with the MAFia while data logging SVTs, but I'm looking at MAF volts. However, I can't recall using it on the Zetec and I would look at MAF counts on that engine.
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Old 10-29-2009, 12:55 AM   #18 (permalink)
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Default Re: low maf voltage
Quote:
Originally Posted by focub View Post
are you talking to me? im confused... all i know is that i never had problems logging my maf counts before... i wish i could get a mafia to just try it and see if it fixes it real quick. plus it would allow me to go to the meet this weekend... if u are talking to me i know that the mafia effects the voltage and allows the stock maf to exceed the limits of its stock paramiters...
I think he was talking to you...
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Old 10-31-2009, 08:25 AM   #19 (permalink)
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oh.... well im lost then.... lol
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