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Home >> Lexus >> 1995 >> ES 300 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Air Control (IAC) System >> IAC System Operation
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IAC System Operation

  1. Ensure engine is at normal operating temperature. Ensure idle speed is 650-750 RPM. See CONNECTING TACHOMETER  under INTRODUCTION. Shift transmission into Neutral. Turn A/C off. Connect Jumper Wire (09843-18020) between terminals TE1 and E1 of DLC No. 1. See Figure.
  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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