Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1995 GMC Vandura, 1995 GMC Rally, 1995 GMC Pickup, 1995 Chevrolet Sportvan, and 1995 Chevrolet Pickup. 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" Series) Ignition Control

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

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