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Re: GM C3 question..is Diagnostic Mode hardwired in ECM?
Posted to Technical Discussion Forum on 5/18/2003 5 Replies

OK, the question still remains: what year, make, model, and engine code is this car? And, what does Allen define as "diagnostic mode"? Snap-on never used that term in its scan tool instructions.

Those zero voltage readings and max temp reading suggest a grou... Login to read more.

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