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Idle Speed & Mixture: V6: Highlander

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2002 Toyota Tundra, 2002 Toyota Tacoma, 2002 Toyota Sienna, 2002 Toyota Sequoia, and 2002 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.
  1. Idle speed is controlled by Engine Control Module (ECM) and is not adjustable. Check idle speed with engine at normal operating temperature, transaxle in Neutral, parking brake applied, air cleaner and all air intake hoses installed, all vacuum hoses installed, electronic fuel injection system wiring connectors properly installed, ignition timing properly set, electric cooling fan off, and A/C and all accessories off.
  2. Start engine and warm engine to normal operating temperature. Shut engine off. If Toyota hand-held tester is available, go to next step. If Toyota hand-held tester is not available, go to step  4.
  3. Connect Toyota hand-held tester to data link connector No. 3 at driver's side of instrument panel. See Figure. Apply parking brake. Place transaxle in Neutral. Start engine and allow engine to idle. Note idle speed on hand-held tester. Ensure idle speed 650-750 RPM. If idle speed is not within specification, check Idle Air Control (IAC) valve, wiring and Engine Control Module (ECM), and air intake system. See IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. Shut engine off. Remove hand-held tester.
  4. Note location of data link connector No. 3 at driver's side of instrument panel. See Figure. Using Jumper Wire (SST 09843-18020 or SST 09843-18040), connect tachometer lead to terminal No. 9 (TAC) on data link connector No. 3. See Figure. Start engine and note idle speed. Ensure idle speed is 650-750 RPM. If idle speed is not within specification, check Idle Air Control (IAC) valve, wiring and Engine Control Module (ECM), and air intake system. See IDLE CONTROL SYSTEMS in SYSTEM & COMPONENT TESTING - V6 & V8 article. Shut engine off. Disconnect tachometer.
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