After finishing secrion 2 on scanner danner premium, I used my snap on triton D8 osciliscope to carry out some tests on my 2008 Toyota hiace Petrol 2.7L on the cam sensor. With the sensor plugged or unplugged the reference signal was -5v but why was it -5 as in negative 5 on the scope? I had to raise my 0 line to see it when i saw on the live that it was -5. When I carried out the by pass test, connecting my incondescent test light to battery ground and touching the signal wire, it would pull the signal from -5 to about 7v and it did generate a signal on the scope, which i understand it proves the wire is good and the computer is good. The main thing i want to know is why was it at -5?
That's very peculiar. It sounds as if the negative lead of the scope was connected to battery positive instead of battery ground, or the leads got reversed when connected to the scope.
Did you check your connections by measuring battery voltage first before connecting to the cam sensor circuit? It may be set to inverted.
Replied by lubetechautomotive123 on topic cam sensor
my black lead was connected to the black ground port of the scanner and went to battery ground and yellow lead to channel 1 to the signal wire, im sure of it. I just checked the video i took of me carrying out the test and i said something wrong. I said i had my test light to battery ground but really it was on battery positive. when i had it on ground and touche d the signal wire, nothing would happen it would stay -5v but when changing polarity to battery positive and touching the signal wire it would pull the signal from -5 to 7v. would love some insight on this.
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