MAF code (ATTN: Grumpy, Glenn, and MAF guys)
03-20-2002, 04:25 AM
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MAF code (ATTN: Grumpy, Glenn, and MAF guys)
Has anyone discovered exactly what the 165 ECM does with the MAF data? So far, we know that the MAF sends a voltage signal to the ECM, that the voltage signal is eventually converted to grams/sec using the MAF tables, that injector pulsewidth is calculated somehow, and that the MAF data, in some form, affects the pulsewidth calculation. In my mind, that leaves a lot of gaps, and who knows what happens when a digital MAF is plugged in. Can anyone shed some light on this? I am particularly interested in the pulsewidth calculation (both WOT and closed loop) and how the various data are used in the calculation. I am also curious as to how, exactly, the MAF tables are used.
Thanks,
Jon :)
Thanks,
Jon :)
03-20-2002, 07:03 AM
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Car: An Ol Buick
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Transmission: Janis Tranny Yank Converter
Re: MAF code (ATTN: Grumpy, Glenn, and MAF guys)
Originally posted by Jon88GTA
Has anyone discovered exactly what the 165 ECM does with the MAF data? So far, we know that the MAF sends a voltage signal to the ECM, that the voltage signal is eventually converted to grams/sec using the MAF tables, that injector pulsewidth is calculated somehow, and that the MAF data, in some form, affects the pulsewidth calculation. In my mind, that leaves a lot of gaps, and who knows what happens when a digital MAF is plugged in. Can anyone shed some light on this? I am particularly interested in the pulsewidth calculation (both WOT and closed loop) and how the various data are used in the calculation. I am also curious as to how, exactly, the MAF tables are used.
Has anyone discovered exactly what the 165 ECM does with the MAF data? So far, we know that the MAF sends a voltage signal to the ECM, that the voltage signal is eventually converted to grams/sec using the MAF tables, that injector pulsewidth is calculated somehow, and that the MAF data, in some form, affects the pulsewidth calculation. In my mind, that leaves a lot of gaps, and who knows what happens when a digital MAF is plugged in. Can anyone shed some light on this? I am particularly interested in the pulsewidth calculation (both WOT and closed loop) and how the various data are used in the calculation. I am also curious as to how, exactly, the MAF tables are used.
I think there was a copy of it at the ECMGUY's Site
03-20-2002, 02:20 PM
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I have the hack, and I know that I'll eventually have to wade through it for myself. I'm just looking to see what information is already out there. Reading hacks and interepreting assembly is much easer for some members of this board than others.
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