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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 >> Test Conditions:

July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Test Conditions:

Code EO24 clear, transmission in Park or Neutral and vehicle speed zero MPH.

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