Testing mass air flow sensor

CaptainRich · Dec 6, 2007, 07:14 AM

Quote:

Originally Posted by naderme

Can anyone tell me how to test air mass flow meter ( sensor)?
I have 2003 Toyota corolla ( Altis in Philippine) 1.8G and has been running very well since I bought it new. Two days ago while driving to work, the car suddenly stopped, and will not start again. It had to be toed to Toyota and after two days testing, I was told they need to replace the air mass flow sensor, price around $500 plus $100 for labor. The car seems to be OK for now? I was given the dud sensor, but something tells me I had been taken for a ride? That is why I am requesting to know if it is possible to test the dud sensor using an ammeter or voltmeter.
Any help is greatly appreciated

Inspect for dust or contaminants on the sensor: see the picture with the arrow.
Using an ohmmeter, measure the resistance between terminals THA and E2. Resistance: At -20 °C (-4 °F) 13.6 - 18.4 KOhm At 20 °C (68 °F) 2.21 - 2.69 KOhm At 60 °C (140 °F) 0.49 - 0.67 KOhm

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2. Inspect the intake air flow meter operation.

1. Connect the intake air flow meter connector.
2. Turn the ignition switch to ON.
3. Using a voltmeter, connect the positive (+) tester probe to terminal VG, and negative (-) tester probe to terminal E2G.
4. Blow air into the intake air flow meter, and check that the voltage fluctuates.

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TxGreaseMonkey · Dec 6, 2007, 07:40 AM

The MAF Sensor may only have needed to be sprayed with MAF Sensor Cleaner, such as the CRC product below:

CRC Industries Automotive

It's available at WalMart.

naderme · Dec 6, 2007, 08:31 PM

Hi guys,
I am deeply grateful for you both
CaptainRich,
I have followed your information, and since in Manila (where I am assigned ) the temp. Seldom gets below 30 deg C, I plotted the figures you provided to get an approximate value for the Om expected to be @30 deg, which was 2.3kOm. When I carried the test on the sensor as per your instruction, at a scale of x1k the needle swung to zero, and when used x100 scale it registered 10. I guess that shows Toyota people were right after all
Thanks a lot for your help

Duane in Japan · Dec 6, 2007, 11:39 PM

Naderme, I am coming into Manila in a few days (Thur late, 13th) do you know anyone or yourself that would like to make a few bucks driving me to Angeles City / Clark / Fields Ave area?

I would only proof out a bad MAF with an Oscilloscope, because I own one but its a tough call sometimes without watching its pattern on a scope, of course, if its really really bad then the voltmeter will usually work.

kitch428 · Dec 7, 2007, 01:13 PM

Wow, that's expensive in the Philippines! Good call on getting it fixed, though.

naderme · Dec 7, 2007, 07:11 PM

Hi Duane,
Thanks for your input. As for your trip to Philippine, unfortunately I can not oblige, cause I will be leaving Philippine for my X-mass vacation, this coming Sunday.

Kitch428,
That is not the only thing expensive in Philippine. Except for rice everything else is !

Duane in Japan · Dec 7, 2007, 10:22 PM

Thanks for your reply and have a good vacation, I know I am.

viperjet · Oct 22, 2009, 05:38 PM

I need to do a resistance check on my Intake Air Temperature (IAT) sensor on my 2006 Corolla ALTIS. But seem like it the IAT is located in the MAF which consist of a few wires.

http://img42.imageshack.us/img42/5429/22102009305.jpg
http://img132.imageshack.us/img132/4710/22102009307.jpg
http://img94.imageshack.us/img94/5889/22102009309.jpg

Anyone knows which 2 color wires belong to the IAT ?

Please advice. Thanks ..

kitch428 · Oct 22, 2009, 06:16 PM

Testing mass air flow sensor

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