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Title: MAF and other sensors Post by: masterj on February 18, 2012, 07:07:42 AM Hey all! :)
What other sensors ME7.5 uses to control AFR when MAF is disconnected? In my car there's also MAP sensor. Is it used when MAF fails? Or only o2 sensor controls AFR when MAF is disconnected? Thank you for your answers Title: Re: MAF and other sensors Post by: matchew on February 18, 2012, 07:14:08 AM When the MAF is deemed to have failed the ECU falls back to air flow calculated from throttle angle.
Title: Re: MAF and other sensors Post by: julex on February 19, 2012, 09:16:31 AM unless the car has wideband o2 from factory in which case it uses these.
Title: Re: MAF and other sensors Post by: matchew on February 19, 2012, 09:36:49 AM No
The ECU uses calculated air flow from throttle plate angle, and the wide band 02 correct any discrepancy between actual lambda and requested lambda. Title: Re: MAF and other sensors Post by: masterj on February 19, 2012, 10:06:51 AM No The ECU uses calculated air flow from throttle plate angle, and the wide band 02 correct any discrepancy between actual lambda and requested lambda. Thank you. Now is it normal that air flow calculated from throttle angle is corrected ~20% by wideband o2 sensor? Title: Re: MAF and other sensors Post by: matchew on February 19, 2012, 10:23:47 AM Depends on your set up and calibration. If you have changed things away from stock and not calibrated the correct tables, then don't expect to see/feel a stock response.
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