Duramax Diesels Forum Truck of the Week
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Old Yesterday, 08:37 AM
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If you got 12v on your 5v reference circuit, I'd figure that out first
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Old Yesterday, 09:13 AM
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Quote:
Originally Posted by juddski88 View Post
If you got 12v on your 5v reference circuit, I'd figure that out first
LMM MAF sensor has a 12 volt input directly from the fuse box.
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Old Yesterday, 09:56 AM
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Quote:
Originally Posted by JoshH View Post
LMM MAF sensor has a 12 volt input directly from the fuse box.
I see that. Shouldn't the "signal" from the ECM be 5v?

I understand that the ECU raw data measured is hz, but if the voltage or the amperes is not correct, I would bet that has a direct effect on frequency

Correct me if I'm wrong please, but isn't this the type of MAF sensor the lmm and newer Duramax use?

"A Kármán vortex sensor works by disrupting the air stream with a perpendicular bow. Providing that the incoming flow is laminar, the wake consists of an oscillatory pattern of Kármán vortices. The frequency of the resulting pattern is proportional to the air velocity.

These vortices can either be read directly as a pressure pulse against a sensor, or they can be made to collide with a mirror which will then interrupt or transmit a reflected light beam to generate the pulses in response to the vortices. The first type can only be used in pull-thru air (prior to a turbo- or supercharger), while the second type could theoretically be used push- or pull-thru air (before or after a forced induction application like the previously mentioned super- or turbocharger). Instead of outputting a constant voltage modified by a resistance factor, this type of MAF outputs a frequency which must then be interpreted by the ECU."

Also, the correct operation of the air temp 1 sensor, and in the case of the LML at least, the post cac temp sensor are critical to the ECU calculating the correct g/sec
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I would never have learned what I have without George Alexander, Mike Lovrich, David Browning, Matt Handwork, Ben Tyler, Evan Drosehn and countless members of this forum and others.
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