code P0102

**PCTGTP** · 07-30-2009

hello new poster,
have been reading forums for a couple of days now trying to find a solution to the 00GTP with 140k on it.

code p0102 scanned by my local auto zone right down the street, replaced MAF sensor(remanufactured one

) and did it right in the zones parking lot, cleared code started it up drove for 20 mins came home parked it went to go to work 11pm that night light back on ever since.

Checked for vacum leak.
checked wires.
check for blockage air breather, replaced air filter(stock)

any ideas would greatly be appreciated,
thank you in advance.

**mystic231** · 07-30-2009

AutoZone = FAIL At least when it comes to MAF sensors. I've had much better success with NAPA MAF's then AZ's. All of them are "remanufacturered" so it boils down to who is doing the remanufacturing. NAPA has a lifetime warranty.

How does the car run? Smooth as usual or rough/choppy?

Have you re-scanned to see if it's the same code? If the wires in the connector look good (check for bent or dirty pins) then I would change the MAF again.

**PCTGTP** · 07-31-2009

thanks for the heads up:
yea same code still showing, sad part is is there anyway to check the maf sensor to see if it's bad they say they won't take the part back once installed 0.o wth!
still running like crap and to have to drop another 170$$ into it *Ouch*

**mystic231** · 07-31-2009

they say they won't take the part back once installed 0.o wth!

Chain stores are driven by the benjamins; they want your money period. NAPA and Carquest are normally locally owned so they take better care of their customers. Plus (at least in my town) NAPA and Carquest have a couple little trucks to run parts to the mechanics in town. So the mechanics shop there.

Let's look at Code P0102. The PCM sends a voltage to the MAF on the signal circuit (one of the four wires). The MAF uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The frequency varies within a range of around 2000 Hertz at idle to about 10,000 Hertz at maximum engine load. P0102 sets if the PCM detects a frequency lower than the possible range of a properly operating MAF sensor.

Start by inspecting for the following conditions:
1. A restricted air intake duct
2. A collasped air intake duct
3. A dirty air filter element
4. Any objects blocking the air inlet screen of the MAF sensor
5. Any debris on the sensing elements of the MAF sensor
6. Any vacuum leak downstream of the MAF sensor
7. A MAF sensor that is installed backwards
8. A restricted exhaust system

A low minimum air rate through the sensor bore may cause P0102 to set during idle or during deceleration. Inspect for vacuum leaks downstream of the MAF sensor. The conditions required to set code P0102 are:
1. The engine cranking for 0.5 second or running 1 second.
2. The engine speed is more than 50 RPM.
3. The ignition 1 signal is more than 8 volts (battery isn't dead)
4. The idle air control (IAC) position is more than 5 counts.
5. The above conditions are met for more than 0.5 seconds.
So as you can see it doesn't take much for this code to set.

anyway to check the maf sensor to see if it's bad

In order to check the MAF sensor you need some way to watch the output and see if its linear. On my car I got the following readings:

0 RPM = 0.21 LB/M
950 RPM + 0.91 LB/M
1150 RPM = 1.36 LB/M
2086 RPM = 2.06 LB/M

If it were me my next step would be to get some MAF cleaner (Yes they make it, Advance Auto carries it) and clean the MAF up real good and reset the code again. Check the condition of the wiring harness making sure there is a good connection on all four wires.

**PCTGTP** · 08-01-2009

again ty for your info and your time,

i did clean the maf with carb cleaner, and i did check for vacum leaks with the carb cleaner while the engine was running as well.

I have made a appointment with the local mechanic here for tuesday to put it on the diagnostic equipment to try and nail this thing down.

hopefuly

**2000GTP** · 08-02-2009

i agree autozone MAf's suck! i made that same mistake... never doing that again

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