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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 >> Notes
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Code 99 Tach Output Circuit: Notes

PCM receives an RPM signal from the ignition module. PCM then modifies this signal and sends it to the tachometer.

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