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Home › Cadillac › 1990 › Seville STS, 4T60/ME9 › Repair and Diagnosis › Engine Performance › System › Engine Controls - Tests W/Codes › ECM Trouble Code Charts › ECM Code EO23, Est Circuit Problem › Test Conditions (Run):

Test Conditions (Run):

By-pass line high with reference pulses being sent to ECM from HEI module.

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