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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 99 Tach Output Circuit >> Diagnostic Aids
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Diagnostic Aids

Inspect harness and all related connections, including PCM connections.

Fig 1: Code 99 Schematic (5.7L) Tach Output Circuit
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Fig 2: Code 99 Flow Chart (5.7L) Tach Output Circuit
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