Thread: MAF, ADC1,2, and 3 all show 5v

Hey all,

If the IAT is showing 5v flat, I am assuming either the resistor in the breakout box or the IAT sensor is toasted right?

Also if you dont have anything connected to the ADC port, is it picking up the 5v signal from what is connected to the 5v-out on the breakoutbox?

My logs seems to indicate that ADC0 is to the MAP, ADC1,2,and 3 all have the same voltage as the MAF.... Is this normal?

Now after it stops working, MAF voltage is 5v, ADC1,2, and 3 all show the same 5v

The ADC inputs that are open will show voltage that is bled off of the other ADC inputs, it isn't anything to worry about though. It only shows this behavior if you have nothing connected to them.

Ah thanks for that, voltage bleeding off didnt know that was a thing

If you disconnect everything from the breakout box or not even plug it in, you will see the voltage will fluctuate on the ADC inputs (even with nothing being plugged into them).

What I have done in the past is to simply ground all of the un-used ADC inputs so they are a stable 0 volts in the log. You can do this to your un-used inputs if it bothers you.