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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 102 (ENGINE CONTROLS - THEORY & OPERATION)FUEL SYSTEMIDLE SPEEDIDLE SPEED CONTROL SYSTEM (ES300 & RX300)
2004 Toyota Matrix XR, FWD, Standard

Idle Speed Control System (ES300 & RX300)

2004 Toyota Matrix XR, FWD, StandardSECTION Idle Speed Control System (ES300 & RX300)
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2003 Lexus SC 430, 2003 Lexus RX 300, 2003 Lexus LX 470, 2003 Lexus LS 430, and 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

Engine Control Module (ECM) is programmed with engine idle speed values. Idle speed control system provides a stable idle speed when engine is cold or idle speed decreases due to electrical load etc. ECM uses various input signals to maintain proper idle speed by controlling Idle Air Control (IAC) valve. IAC valve is located under No. 1 throttle body.

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • The engine overheats, stalls repeatedly, or misfires under load.
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