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Additional info required: A while ago (like a year or more) there were some threads floating around about O2 sensor voltage readings in the 3+ volt range on diagnostic scanners. I don't recall there being a clear answer as to the reason at the time. I have had some O2 sensor issues recently so I went digging for info and basically found that the reason for the trouble was that I bought the wrong type of sensor. I bought an O2 sensor, when what I needed was an Air/Fuel Ratio sensor. The problem was on a Toyota, but the same principles of how the sensors differ apply to every brand of vehicle. The link below comes from a website we use in school, and has tons more info about various sensors and their functions, as well as dozens of other tech articles that can be useful during diagnosis of a problem. What my issue boiled down to is the ECU was getting a reading of incredibly lean mixture from the O2 sensor. Because on an O2 sensor rich = high voltage and lean = low voltage. but wih an A/FR sensor its the opposite, rich = low and lean =high. The ECU would add more fuel and get a rich voltage back rom the sensor,except the ECU is programmed to read high voltage as lean, even though the sensor was responding as it should. And so the cycle repeats itself until the ECU can no longer adjust, which in this case pegged the Long Term Fuel Trim at 44.5%. But back to the point, if you get oxygen sensor voltage reading in the 3V range on a scanner, its because you have an Air/Fuel Ratio sensor, which gets supplied a reference voltage of 3.3V from the ECU. The sensor then bumps up (if lean) or bumps down (if rich) the return voltage signal back to the ECU. Some ECUs convert scanner output to a normal O2 sensor output voltage to avoid confusion, but not all. Be sure of what you have before purchasing a replacement sensor. http://www.autoshop101.com/forms/h37.pdf -
Does anyone have access to, or are familiar with, how to operate the first two generations of SSM? I might have an opportunity to buy one or two and it would be nice if I could put them through their paces. Thanks! -
http://www.performancechipsdirect.com/ Does anyone one have any experience with this chip^^^^ or ever heard anything about them? Or does anyone know of a good tuner chip for my 1998 Impreza? -
Hello All, I'm looking to get a code reader as my CEL came on. Not that it's a big deal but I figured it would be handy to have a code reader anyway and then I can clear the CEL. I've been reading over websites about how to choose and through this forum. The only topic from this year that I found relating to choosing a code reader was for ones that hook up to a laptop. I'd rather have a unit that stand alone so unfortunately it wasn't much help. Off the top of my head my wants are: -live view with recording, -on-screen definitions of codes, -laptop not necessary, -ISO-9141 compatible, -$100-ish or less with shipping. I came across this: http://www.autel.us/Products/al519.htm It seems decent, maybe a cheaper brand but seems to cover the bases. Any thought? Thanks!