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Diagnostic Aids

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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", "L" & "M", "S" & "T" Series) Ignition Control
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Fig 3: Code 42 Flow Chart (All Models) Ignition Control
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