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Home >> Buick >> 1987 >> Skyhawk Sport, 2.0 M, Standard >> Repair and Diagnosis >> Engine Performance >> System >> 2.0L PFI Tests >> Diagnostic Code Flow Charts >> Code 43, Electronic Spark Control >> Diagnostic Aids

Diagnostic Aids

Check circuit No. 496 for a potential short or open to ground. Also check for proper installation of MEM-CAL. Mechanical engine knock can cause a knock sensor signal. Abnormal engine noise must be corrected before using this chart.

NOTE: Code 43 circuit diagram and flow chart has been updated by Technical Service Bulletin No. 91-6-6, dated 8/24/90 for Pontiac models and Technical Service Bulletin No. 91-6E-01, dated 8/24/90 for Buick models.
Fig 1: Code 43 Circuit Diagram, Electronic Spark Control
G200117
Fig 2: Code 43 Flow Chart, Electronic Spark Control
G50E08475
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