LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 1997 >> ES 300 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Idle Control System >> Idle Air Control (IAC) System >> IAC System Operation
April 5, 2026: LEMON Manuals is launched! Read the announcement.

IAC 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 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.
scientia non olet · About LEMON Manuals