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Home >> Cadillac >> 1990 >> Seville Base, 440T4/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):
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Test Conditions (Run):

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