MAF sensor waveform analysis

  • Monde
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13 Jan 2020 07:21 #36564 by Monde
MAF sensor waveform analysis was created by Monde
Good morning, guys. Could anyone explain this waveform? I am trying to figure out the second rise of the pattern. the first one is from the snap, followed by the drop, ( from the release of the gas pedal0 the rise again ( from nowhere as far as I know)

File Attachment:

File Name: mafcapture.psdata
File Size:25 KB

File Attachment:

File Name: mafcapture.psdata
File Size:25 KB


Know good waveform from a 2004 Lexus RX330 3.3 L

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  • Chad
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13 Jan 2020 12:25 #36568 by Chad
Replied by Chad on topic MAF sensor waveform analysis
When the throttle plate is closed, there is a big pressure difference between manifold vacuum and atmospheric pressure. When you snap the throttle, the pressure, RAPIDLY, equalizes .

( 1 ) This RAPID in-rush of air is the first rise.
( 2 ) Now, with the pressure equalized, the in-rush of air, drastically, slows down.
( 3 ) Then, as the RPM's rise, air flow rises, again.



www.scannerdanner.com/scannerdanner-prem...-sensors-part-1.html

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13 Jan 2020 13:56 #36573 by Andy.MacFadyen
Replied by Andy.MacFadyen on topic MAF sensor waveform analysis
When I was learning to use a scope I found it quite a good exercise first time I captured MAF on one channel and MAP on another.

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