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Home >> Cadillac >> 1989 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> DFI ECM Tests W/Codes >> Diagnostic Charts >> ECM Code EO23 - Est Circuit Problem >> Failure Conditions

Failure Conditions

EST pulses are seen by the ECM before by-pass circuit is turned on (5 volts) or EST signal remains grounded after the by-pass circuit is turned on (5 volts).

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