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Re: 93' Blazer 4.3 EST code 42
Posted to Technical Discussion Forum on 11/30/2006 5 Replies

Now that I've said my piece about your original post, I'll get to the technical info.

The PCM will set a code 42 if it sees unexpected activity on the EST circuit. The EST circuit should toggle from 0V to .25-50 below 400 RPM. The EST circuit is grounded thr... Login to read more.

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