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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 140 (ENGINE CONTROLS - SYSTEM & COMPONENT TESTING - V6 & V8)IDLE CONTROL SYSTEMSIDLE AIR CONTROL VALVELAND CRUISER & SEQUOIA
2004 Toyota Matrix XR, FWD, Standard

Land Cruiser & Sequoia

2004 Toyota Matrix XR, FWD, StandardSECTION Land Cruiser & Sequoia
WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 2003 Toyota Tundra, 2003 Toyota Tacoma, 2003 Toyota Sienna, 2003 Toyota Sequoia, and 2003 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

For Idle Air Control (IAC) system testing procedures, see Fig 1 and Fig 2 . To check air induction system, see ACOUSTIC CONTROL INDUCTION SYSTEM  in AIR INDUCTION SYSTEMS. To replace air induction system, see AIR INDUCTION SYSTEMS in REMOVAL & INSTALLATION - V6 & V8. To check throttle control system, see THROTTLE BODY . To replace throttle body, see THROTTLE BODY under FUEL SYSTEMS in REMOVAL & INSTALLATION - V6 & V8. For circuit identification, see ENGINE PERFORMANCE in appropriate SYSTEM WIRING DIAGRAMS article in ELECTRICAL. See ENGINE CONTROL MODULE POWER & GROUND CIRCUITS  under COMPUTERIZED ENGINE CONTROLS.

Fig 1: Testing Idle Air Control System - Circuit Description & Steps 1-2 (Land Cruiser & Sequoia)
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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