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Cadillac
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1990
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Seville Base, 4T60/ME9
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes
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ECM Trouble Code Charts
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ECM Code EO23, Est Circuit Problem
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Failure Conditions (Crank):
Failure Conditions (Crank):
EST pulses are seen by the ECM before by-pass circuit is turned on (5 volts).