Diagnostic Aids

Scan tester does not have ability to help diagnose a Code 42 problem. See INTERMITTENTS in TESTS W/O CODES article in this section.

Fig 1: Code 42 Schematic (Except Lumina) IC Circuit Open/Grounded

Fig 2: Code 42 Schematic (Lumina) IC Circuit Open/Grounded

Fig 3: Code 42 Flow Chart (All Models) IC Circuit Open/Grounded