Testing Mafs / Mas - Is There A Static Test For Mass Airflow Sensor?
Thread Starter
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Joined: Sep 2001
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From: Pflugerville, TX
Vehicle: 2000 Elantra
anyone? bueller?
Is there a static test that can be done to tell if a MAFS is good or bad without using a scantool?
Specifically, what resistance and voltage value ranges are "normal" for a Hyundai sensor? I've never seen them posted anywhere but it is quite possible I'm looking in the wrong place. I've only ever heard to test a Hyundai w/ a scantool . . . not helpful if I don't have one.
First guess was over-oiled K&N killing it... then I did some searching and found these:
http://www.knfilters.com/MAF/massairfindings.htm
Watch all the videos.
http://www.knfilters.com/MAF/massair.htm
Is there a static test that can be done to tell if a MAFS is good or bad without using a scantool?
Specifically, what resistance and voltage value ranges are "normal" for a Hyundai sensor? I've never seen them posted anywhere but it is quite possible I'm looking in the wrong place. I've only ever heard to test a Hyundai w/ a scantool . . . not helpful if I don't have one.
First guess was over-oiled K&N killing it... then I did some searching and found these:
http://www.knfilters.com/MAF/massairfindings.htm
Watch all the videos.
http://www.knfilters.com/MAF/massair.htm
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From: ɯooɹpǝq ɹnoʎ
Vehicle: ǝdnoɔ sısǝuǝƃ
you want normal range values? There might be something on Webtech (HMA Service)
http://www.rdtiburon.com/index.php?showtopic=11794
http://www.rdtiburon.com/index.php?showtopic=11794
Thread Starter
Super Moderator
Joined: Sep 2001
Posts: 10,795
Likes: 5
From: Pflugerville, TX
Vehicle: 2000 Elantra
I guess I hadn't really done any digging on hyundaitechinfo for this specific information, because it is there. A little anyway. Aside from the scantool stuff, there is this:
If the MAF sensor output voltage is other than 0 when the ignition switch is turned on (engine not running) check for faulty sensor or ECM
Mass air flow sensor output voltage (MAFS side connector No. 1 or ECM harness connector No. 41)
Idle: (800RPM) 0.7-1.1V
3000RPM: 1.3-2.0V
those are a pretty wide spread, but I am guessing a smooth rate of change and values somewhere in those rages would be decent indicators of a good sensor.
There's also a block diagram (no real schematic) of the sensor and it looks to me like you can't measure across the wheatstone bridge directly.
My car runs (very) slightly better with a different MAFS in there and I'll know in a couple of days if it does away with the LTFT MIL's (P1128 with 2.0 ECM, P1127 with 1.8L ECM). Here's hoping, and thank God for a spare sensor! laugh.gif
If the MAF sensor output voltage is other than 0 when the ignition switch is turned on (engine not running) check for faulty sensor or ECM
Mass air flow sensor output voltage (MAFS side connector No. 1 or ECM harness connector No. 41)
Idle: (800RPM) 0.7-1.1V
3000RPM: 1.3-2.0V
those are a pretty wide spread, but I am guessing a smooth rate of change and values somewhere in those rages would be decent indicators of a good sensor.
There's also a block diagram (no real schematic) of the sensor and it looks to me like you can't measure across the wheatstone bridge directly.
My car runs (very) slightly better with a different MAFS in there and I'll know in a couple of days if it does away with the LTFT MIL's (P1128 with 2.0 ECM, P1127 with 1.8L ECM). Here's hoping, and thank God for a spare sensor! laugh.gif