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p38fln · 08-10-2011, 09:27 PM

My 1999 Rav4 (Which did have OBD-II) didn't have a MAF sensor and so couldn't give instant fuel economy, even though it was compatible with OBD-II. It had a MAP sensor instead, which is pretty much useless for fuel flow.

Does your Prizm even have a MAF sensor?

*edit - I see that there's an open source OBD-II scanner available that can imitate a MAF from the MAP sensor after calibration and entering the engine size. Since my vehicles after the Rav4 have all had MAF sensors I haven't had to check it out. Still won't help you on your Toyota --

The Toyota scan tool for an OBD-I Toyota is almost $8,000, not sure if theres an aftermarket version available.

08-10-2011, 09:27 PM	#8 (permalink)
p38fln EcoModding Lurker Join Date: Apr 2011 Location: Eau Claire, WI Posts: 79 Escape #2 - '13 Ford Escape Titanium C-max - '17 Ford C-Max SE Thanks: 0 Thanked 11 Times in 7 Posts	My 1999 Rav4 (Which did have OBD-II) didn't have a MAF sensor and so couldn't give instant fuel economy, even though it was compatible with OBD-II. It had a MAP sensor instead, which is pretty much useless for fuel flow. Does your Prizm even have a MAF sensor? edit - I see that there's an open source OBD-II scanner available that can imitate a MAF from the MAP sensor after calibration and entering the engine size. Since my vehicles after the Rav4 have all had MAF sensors I haven't had to check it out. Still won't help you on your Toyota -- The Toyota scan tool for an OBD-I Toyota is almost $8,000, not sure if theres an aftermarket version available. Last edited by p38fln; 08-10-2011 at 09:48 PM..*