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Home >> Buick >> 1995 >> Roadmaster Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 5.7L >> ECM/Pcm Code Charts >> Code 41, OPTI-Spark Ignition System Open Or Shorted Est CKT >> 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, including coil fuse.

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