MAF Issue

[MeMadMax]

Hey all,
Got a MAF issue.

96' Grand Am.
3.1L with 3.4L intake conversion.
Engine is rebuilt by me
No other mods.

MAF Code P0102 (Low MAF voltage input)
Checked for vacumn leaks(non obvious).
MAP says 37KPA
Replaced MAF
MAF Code P0102 still there
Check voltage to sensor: 14 volts positive and negative on hot and ground???(engine running)
Has new MAF been fried?
MAF Flow is constant 1.93 at idle and high rev(Break in MAF sensor wire? Or did the sucker get fried?).

Going to check the wiring. But waiting to throw another MAF at this thing till I know if the voltage goin to the MAF is supposed to be at 14.

Thanks very much for any help
Love this site

[bszopi]

MAF does get 12V to it (which would be ~14V when the car is running). Are you sure you are getting that on the GND? If so, that is bad. The signal wire should be registering a voltage, although I'm not sure what values is will be sending back to the PCM...

[sprucegagt]

At anytime during your diagnostic routine did you clear the code from the PCM? Sometimes if you don't clear the code it can take 3-5 ignition switch cycles for the PCM to do it on it's own.

[3400-95-Modified]

Typically for a maf code tho the code may stay in memory but his maf values should vary after replacing it... if I unplug my maf and start it I'll get a code, if I plug it back in the SES light goes off, and the maf works as normal, BUT there is a stored code, so I'm doubting its ecm problem by not resetting it.

I would find the pin on the ECM for the maf and check the resistance from that to the plug in the bay.

[MeMadMax]

Hey guys quick update.

Got to checking the wiring out, and the black and yellow wires were crushed together about 5 inches downstream from the connector.

Ooops.

So rewired and the sensor works now.

Now, the computor shows variation in the 4-5 range(on the MAF) during idle.
So the 1.93 is a fixed variable the computer falls back on for a failed sensor?
I would rather have it show 0.0, but meh.

As a side note, now that the computer knows how to "run" the engine, it says the downstream 02 sensor has "too little activity" code p0140. Anyone know what the threshold would be to flag this code? The sensor itself varies anywhere between ~0.395 - ~0.435, what the heck? That sounds like a good amount of activity to me lol

Thanks to everyone that helped before, much appreciated

[sprucegagt]

Your stock O2 sensor should swing between 0 and about 1 volt. What you have is way to small.