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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 7.4L >> Trouble Code Charts >> Code 42, Ignition Control >> Diagnostic Aids
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Diagnostic Aids

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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