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Home >> Lexus >> 1998 >> SC 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Air Control (IAC) System (Es300) >> System Operation
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System Operation

  1. Ensure engine is at normal operating temperature. Ensure idle speed is 650-750 RPM. Ensure transmission is in Neutral. Turn A/C off. Connect Fused Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. See Figure. DLC No. 1 is located right of intake air chamber.
  2. Increases engine speed to about 1000 RPM for about 5 seconds. Release throttle. Idle speed should decrease to 650-750 RPM. If engine speed is not as specified, disconnect jumper wire from DLC No. 1, then go to next procedure.
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