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Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 18 other vehicles, including the 1995 GMC Vandura Special, 1995 GMC Vandura, 1995 GMC Suburban, 1995 GMC Rally Camper Special, and 1995 GMC Rally. However, it is still accessible from the selected car via links, so may be relevant.

The scan tester cannot help diagnose a Code 42 problem. See INTERMITTENTS in TESTS W/O CODES - GASOLINE article.

Fig 1: Code 42 Schematic ("C", "K" & "P" Series) Ignition Control
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Fig 2: Code 42 Schematic ("G" Series) Ignition Control
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Fig 3: Code 42 Flow Chart (All Models) Ignition Control
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