Anyone know how to read wire diagrams, because I am trying to learn, but here:

I thought c101 pin #20 would be abs hydraulic unit, but someone else says it is idle speed control, which I see down on the bottom. So how to I determine which one it is. I plan to pull the rubber back on my c101 connector in my car and write down all the wire colors and the pin # the next time I can.

I thought c101 pin #20 would be abs hydraulic unit, but someone else says it is idle speed control, which I see down on the bottom. So how to I determine which one it is. I plan to pull the rubber back on my c101 connector in my car and write down all the wire colors and the pin # the next time I can.
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