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Home >> Cadillac >> 1990 >> Seville Base, 4T60/ME9 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes >> ECM Trouble Code Charts >> ECM Code EO28: Open 3RD Or 4TH Gear Circuit >> Failure Conditions:

Failure Conditions:

Third gear input to ECM not grounded. Fourth gear input to ECM not grounded.

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