Diagnostic Aids

The scan tester cannot help diagnose a Code 42 problem. See INTERMITTENTS in appropriate TESTS W/O CODES article in this section. See below.

• TESTS W/O CODES - GASOLINE (for "C" & "K" Series)
• TESTS W/O CODES - GASOLINE (For "G" & "P" Series)

Fig 1: Code 42 Schematic ("C" & "K" Series Exc. 5.7L M/T) Ignition Control

Fig 2: Code 42 Schematic ("C" & "K" Series 5.7L M/T) Ignition Control

Fig 3: Code 42 Schematic ("P" Series A/T) Ignition Control

Fig 4: Code 42 Schematic ("G" Series) Ignition Control

Fig 5: Code 42 Schematic ("P" Series M/T) Ignition Control

Fig 6: Code 42 Flow Chart Ignition Control