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Cadillac
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1989
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DeVille 4D Sedan
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Repair and Diagnosis
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Engine Performance
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System
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DFI ECM Tests W/Codes
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Adjustments
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Code E30 - Idle Speed Control Circuit Problem
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Failure Conditions:
Failure Conditions:
ISC plunger extending with TPS less than or equal to 12 degrees.
ISC retracting with TPS greater than 1.7 degrees for 15 seconds.