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Home >> Toyota >> 2003 >> Matrix Base, FWD, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Removal & Installation 4-Cylinder >> Computerized Engine Controls >> Engine Control Module >> Notes
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Engine Control Module: Notes

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
(1) For illustration of ECM location, see COMPONENT LOCATIONS in SYSTEM & COMPONENT TESTING - 4-CYLINDER article.