VW nixed a MAF on 1.8TSI
Posted: Sun Jun 08, 2014 3:28 am
So, my brother-in-law who is a VW tech is diagnosing a 2014 Passat 1.8TSI (EA888 Gen 3) that randomly stalls and gets a "MAP Sensor Signal Implausible" code set. Has new MAP and wiring all the way to ECM. Of course, there are basically no tech bulletins out for this car, but I digress.
The reason I am posting is the first thing I noticed when helping him out is that the engine has no MAF. If the MAP is unplugged the car still runs, so it must drop back to alpha-N since it doesn't have a MAF to reference. I was under the impression that pretty much all modern ECMs use a MAF because emissions requirements are so strict that speed-density mapping just doesn't cut it, especially during startup and transients. I thought it was pretty interesting that VW is only ditching the MAF now, after so many problems with them 10+ years ago, and also that more and more people running standalone EFI are using MAF.
Comments? Anyone know if this is a general movement in the industry?
The reason I am posting is the first thing I noticed when helping him out is that the engine has no MAF. If the MAP is unplugged the car still runs, so it must drop back to alpha-N since it doesn't have a MAF to reference. I was under the impression that pretty much all modern ECMs use a MAF because emissions requirements are so strict that speed-density mapping just doesn't cut it, especially during startup and transients. I thought it was pretty interesting that VW is only ditching the MAF now, after so many problems with them 10+ years ago, and also that more and more people running standalone EFI are using MAF.
Comments? Anyone know if this is a general movement in the industry?