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Home › Cadillac › 1988 › Seville Base › 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) › Test Conditions:

Test Conditions:

Ignition on. Engine speed greater than or equal to 304 RPM.

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