Mike's Workshop Manuals
: Service manuals for every vehicle
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Cadillac
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1991
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DeVille Base, 2D Coupe
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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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Pcm Flow Charts Codes E12 To E99
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Pcm Code E30, Idle Speed Control Circuit Problem
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Failure Conditions:
Failure Conditions:
TPS at 14 degrees or greater and ISC is retracting for 15 seconds.
TPS at 2 degrees and ISC is extending for 15 seconds.