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

Fig 2: Code 42 Schematic ("G" Series) Ignition Control

Fig 3: Code 42 Flow Chart (All Models) Ignition Control