badass99ss

iTrader: (17)

Car will not start. Found something odd to me today. I was probing the cam sensor wire harness and from what I understand is the RED is 12v supply, PIK/BLK is ground, and BRN/WHT is sig. Here is what happens....

Power on to the PCM
Test light grounded and stick RED, 12v and it triggers the fuel pump relay...?
Test light on power(hot) and stick PNK/BLK and get ground...good
Test light on power(hot) and stick BRN/WHT and get nothing.....?


Why does the PCM get signal from the red 12v supply and nothing from the BRN/WHT??

Troy

edcmat-l1

iTrader: (10)

You shouldn't be checking it with a test light. Too invasive. You need to be using a lab scope or DVOM with a bar graph.

When you probe with a test light you're pull each circuit down to ground through the bulb.

badass99ss

iTrader: (17)

Do you mind looking at this thread? Maybe you can think of something.


https://ls1tech.com/forums/generatio...-question.html


Thanks
Troy