Originally Posted by rockandrollfrankie
Well, according to the diagram, I am not testing through a motor, resistor, or anything. I have the fuse out of the block, so I'm just testing flow from the ignition switch as far as I can tell. Maybe I wasn't paying attention in school, but a switch in the off position shouldn't have any flow, ground or otherwise. I've also never had a car shunt to ground at the fuse block when the key was off, so once again, is this normal behavior or not? You can't lead me to believe every mechanic has a BS in EE. Also, I'm not even a mechanic, I'm a computer engineer that enjoys cars with an old Mustang that's sentimental to me that I'd like to get running properly. I don't understand the general resistance to my question.
Maybe I should reapproach the question. Can anybody tell me the common reasons a car would throw a 212 code? Afterall I am on "THE Late Model Mustang Site" aren't I?
lets see this diagram?
Oh, and auto techs these days, do need BS in EE or they fall to the waste side
it took EE, to design these cars, is it a leap of faith to suggest EE is needed to diagnose
you know most diag shops charge flat rate for a diag, usually an hour, and can do 4 cars in an hour
tools, and understanding of circuit design
You are confused of the code 212, I can see how, but rest assured that code is NOT for DIYers................unless someone that knows how it works tells all
the ecm monitor looks for High or LOW, Boolean logic,,,,remember
compares that bit to the expected bit, when IFelse, then flags. and CEL.
you read said code, and are looking for only a short
can be open, anything that makes LOW voltage when it should be HIGH
that is the monitors purpose.
so show us the diagram you are using?
the transistor inside the ICM must have a ground, PNP, or NPN collector/emitter