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Home >> Cadillac >> 1988 >> Seville STS >> Repair and Diagnosis >> Engine Performance >> System >> DFI ECM Tests W/Codes >> ECM Code EO23 - Est Circuit Problem >> ECM Code EO23 - Est Circuit Problem (1 Of 2) >> Failure Conditions:
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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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