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Home >> Lexus >> 1997 >> LS 400 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Air Control (IAC) System >> IAC System Operation

IAC System Operation

Start engine. While shutting engine off, listen for a click from IAC valve. If click is heard, IAC system is okay. If click is not heard, perform IAC system circuit test.

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