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Home › Pontiac › 1994 › Firebird Formula, 2D Convertible, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes - 5.7L › ECM/Pcm Code Charts › Code 99 Tach Output Circuit › Diagnostic Aids

Diagnostic Aids

Inspect harness and all related connections, including PCM connections.

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

G94H35185

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

G94I35186