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Home >> Pontiac >> 1994 >> Firebird Formula, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 5.7L >> ECM/Pcm Code Charts >> Code 41, OPTI-Spark IGN SYS Open Or Shorted Est Circuit >> Diagnostic Aids
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Diagnostic Aids

Because coil driver gets its power from coil, check ignition feed circuit to ignition coil for opens.

Fig 1: Code 41 Schematic (5.7L) Opti-Spark Ignition System Open Or Shorted EST Circuit
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Fig 2: Code 41 Flow Chart (5.7L) Opti-Spark Ignition System Open Or Shorted EST Circuit
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