90 Quattro Sport V6-2.8L (AFC) (1995)
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If the idle speed is too high and there are no malfunctions stored in DTC memory:
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Check Closed Throttle Position (CTP) switch.
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Check for large intake air leak.
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Check Idle Air Control (IAC) valve.
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Check learning values for Idle Speed Control (ISC).
If the idle speed is too low and there are no malfunctions stored in DTC memory:
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Check Closed Throttle Position (CTP) switch.
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Check Idle Air Control (IAC) valve.
