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Home >> Lexus >> 1998 >> ES 300 >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - System/Component Tests) >> Idle Control System >> Idle Air Control (IAC) System >> IAC System Operation
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IAC System Operation

WARNING: This page is about a different car, the 1997 Lexus ES 300. However, it is still accessible from the selected car via links, so may be relevant.
  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 Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. See Figure. DLC No. 1 is located on front of intake air chamber.
  2. If engine speed increases to about 1000 RPM for about 5 seconds, then decreases to idle speed of 650-750 RPM, IAC system is okay. If engine speed is not as specified, disconnect jumper wire from DLC No. 1, then go to next procedure.
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