Section 170 (Engine Immobilizer Systems): Description
WARNING: This page is about a different car, the 2002 Toyota Avalon. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
Vehicle is equipped with air bag supplemental restraint system. Before attempting ANY repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in TOYOTA - AIR BAG RESTRAINT SYSTEMS
article.
CAUTION:
When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES
article in GENERAL INFORMATION before disconnecting battery.
NOTE:
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 and has a smaller key ring opening than a standard ignition key to accommodate the transponder chip in the top of the ignition key. If a problem exists in the engine immobilizer system, a Diagnostic Trouble Code (DTC) may be stored in the Engine Control Module (ECM), but the Malfunction Indicator Light (MIL) will not come on. MIL is displayed as an engine icon near the speedometer on the instrument panel. MIL may also be referred to as CHECK ENGINE light.
Engine immobilizer system is a theft deterrent system that disables engine from starting by not allowing fuel injector operation and ignition system operation unless ignition key identification code matches identification code stored in Engine Control Module (ECM). Engine immobilizer system consists of Engine Control Module (ECM), SECURITY indicator light, ignition key with built-in engine immobilizer transponder chip and ignition switch with integral transponder key coil and transponder key amplifier. See Figure.