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Avalon & Sienna

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. Start engine. Warm engine to normal operating temperature. Ensure idle speed is within specification. See IDLE SPEED & MIXTURE in ON-VEHICLE ADJUSTMENTS - V6 & V8 article. Turn ignition off. Apply parking brake and place transaxle in Neutral. Ensure A/C is off.
  2. On Avalon, install Jumper Wire (SST 09843-18020 or SST 09843-18040) between terminals TE1 and E1 on data link connector No. 1 located in the engine compartment on end of air intake chamber at passenger's side of engine. See Figure. On Sienna, install Jumper Wire (SST 09843-18020 or SST 09843-18040) between terminals TC and E1 on data link connector No. 1 located on engine mount bracket at passenger's side front of engine. See Figure. Go to next step.
  3. On all models, start engine and note engine speed. Engine speed should increase to 1000 RPM for 5 seconds and then return to idle speed. If engine speed is not as specified, test Idle Air Control (IAC) valve operation. Go to next step. If engine speed is as specified, remove jumper wire. Turn ignition off.
  4. To test IAC valve operation, remove IAC valve from throttle body. See THROTTLE BODY under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - V6 & V8 article. Check that valve on inside of IAC valve is half open. See Figure. Reinstall electrical connector on IAC valve.
  5. Turn ignition on. Check that valve on inside of IAC valve moves from half open to fully closed, fully open and then returns to half open within.5 seconds.
  6. If IAC valve operates as specified, wiring circuit, Engine Control Module (ECM) and IAC valve are okay. If IAC valve operates properly but idle problem still exists, the air assist system may be defective. For testing of air assist system, see AIR ASSIST SYSTEM . If IAC valve does not operate, check wiring circuit between ECM and IAC valve. See ECM LOCATION  table. See WIRING DIAGRAMS article. If wiring circuit and ECM are okay, replace IAC valve.
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