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Home >> Pontiac >> 1990 >> LeMans Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> Code Charts >> Code 42, Electronic Spark Timing (Est) >> Diagnostic Aids

Diagnostic Aids

The Scan tester cannot help diagnose Code 42 problems. If Code 42 is intermittent, see INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.

Fig 1: Circuit Diagram Code 42
G90D15548Courtesy of GENERAL MOTORS CORP.
Fig 2: Flow Chart Code 42
G121780Courtesy of GENERAL MOTORS CORP.
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