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Re: The dreaded code 42, 1988 2.8 codeW
Posted to Technical Discussion Forum on 4/27/2001 2 Replies

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Excellent Young Master Gage...

On intial cranking, ECM sees Dref (rpm), produces the EST, sees EST toggling high (not pulled low by ICM), sets code 42, and refuses to apply 5v to bypass.

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