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Re: Old school GM serial data diagnosis
Posted to Technical Discussion Forum on 6/15/2022 3 Replies

Hi Robert,

This one is not a ring. 800 goes from the DLC to a splice, where it splits apart with just one wire going to each module. At the PCM, 800 goes to pin C5, comes right back out at C3, then takes a shunt (circuit 774) to C4 where it goes back in to t... Login to read more.

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