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Home >> Cadillac >> 1988 >> Seville Base >> Repair and Diagnosis >> Engine Performance >> System >> DFI ECM Tests W/Codes >> ECM Code EO63 - Vehicle Speed/Set Speed Difference Too High >> DFI ECM Tests W/Codes >> Notes On Intermittents
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Notes On Intermittents

If code EO63 is setting intermittently make sure owner is not overrunning set speed in excess of 20 MPH. Check vacuum source and brake release vacuum lines for proper connections and/or leaks.

Fig 1: Schematic, Code EO63, Vehicle Speed/Set Speed Difference To High
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Fig 2: Flow Chart, Code EO63, Vehicle Speed/Set Speed Difference To High
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Fig 3: Flow Chart, Code EO63, Vehicle Speed/Set Speed Difference To High
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