Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSTOYOTA2004MATRIX XR, FWD, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 143 (ENGINE CONTROLS - REMOVAL & INSTALLATION 4-CYLINDER)COMPUTERIZED ENGINE CONTROLSENGINE CONTROL MODULENOTES
2004 Toyota Matrix XR, FWD, Standard
Engine Control Module: Notes
2004 Toyota Matrix XR, FWD, StandardSECTION Notes
WARNING: This page does not describe the selected car, but rather 11 other vehicles, including the 2003 Toyota Tacoma, 2003 Toyota RAV4, 2003 Toyota Prius, 2003 Toyota Matrix, and 2003 Toyota MR2. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
On Camry, Camry Solara, Highlander, MR2, Prius and RAV4, an engine immobilizer system may be used. On models equipped with engine immobilizer system, if Engine Control Module (ECM) is replaced, ECM must be programmed with proper ignition key code for engine immobilizer system. Models equipped with engine immobilizer system may be identified by looking at the ignition key. On models equipped with engine immobilizer system, the top of the ignition key is thicker than a standard ignition key, as a transponder chip is incorporated into the top of the ignition key. For programming procedures, see COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION, or appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.
ECM LOCATION
| Model | (1) Location | ||
|---|---|---|---|
| Camry | Behind Glove Box | ||
| Camry Solara | Behind Glove Box | ||
| Celica | In Engine Compartment, Below Cover, Just In Front Of Battery, Next To Driver's Side Strut Tower | ||
| Corolla | Behind Glove Box | ||
| ECHO | Behind Glove Box | ||
| Highlander | Behind Glove Box | ||
| Matrix | Behind Glove Box | ||
| MR2 | On Inside Of Firewall, Directly Behind Driver's Seat & Luggage Compartment | ||
| Prius | Behind Glove Box | ||
| RAV4 | Above Passenger's Side Kick Panel, Behind Glove Box | ||
| Tacoma | Behind Glove Box | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.