Engine Immobilizer System

Avalon, Camry Gasoline Models, Camry Solara, Highlander, Land Cruiser, MR2, RAV4, Sequoia, Sienna & 4Runner

Engine immobilizer system is a theft deterrent system that disables engine from starting. This is accomplished by not allowing fuel injector and ignition system operation unless ignition key identification code matches code stored in Engine Control Module (ECM). Engine immobilizer system may be standard equipment on some models or optional equipment on other models. 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. Engine immobilizer system consists of ignition key with transponder chip, transponder key coil, transponder key amplifier and ECM. When ignition key is inserted into ignition lock cylinder, the ECM instructs transponder key coil on ignition lock cylinder to supply an electromagnetic energy that enables transponder chip to transmit an ignition key identification code signal.

Transponder key amplifier then amplifies ignition key identification code signal and delivers code signal to the ECM. ECM compares received ignition key identification code signal to code stored in the ECM. If ignition key identification code signal and code in the ECM match, ECM will allow fuel injector operation and ignition system operation. If ignition key identification code signal and code in the ECM do not match, ECM will not allow fuel injector operation and ignition system operation. For additional information on system operation and testing, see appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

Prius

2001 ENGINE PERFORMANCE Theory & Operation

Engine immobilizer system may also be referred to as Hybrid Vehicle (HV) immobilizer system. Engine immobilizer system is a theft deterrent system that disables hybrid system and prevents engine from starting by not allowing fuel injector and ignition system operation unless ignition key identification code matches code stored in Hybrid Vehicle (HV) control Electronic Control Unit (ECU). Hybrid vehicle control ECU is referred to as HV ECU.

Engine immobilizer system consists of ignition key with transponder chip incorporated in top of ignition key, transponder key coil, transponder key ECU and HV ECU. When ignition is turned on, the transponder key ECU checks if ignition key is registered and delivers the result to the HV ECU. When HV ECU confirms ignition key is registered, it transmits its own identification numbers to the transponder key ECU. The transponder ECU then calculates internally and delivers the calculated result back to the HV ECU. The HV ECU rechecks the calculated result against calculation stored in the HV ECU. If calculations are the same, the HV ECU allows hybrid system operation and allows the engine to start. If calculations are not the same, the HV ECU will not allow hybrid system operation and the engine to start. For additional information on system operation and testing, see appropriate ENGINE IMMOBILIZER SYSTEMS article in ACCESSORIES & EQUIPMENT.

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Responses

  • karen
    How to remove immobilizer of toyota sequoia 2001?
    8 months ago
  • veli-matti
    How to locate immobilizer of toyota sequoia 2001?
    8 months ago
  • chelsea
    Where can i find toyota sequoia immobolizre unit?
    4 months ago
  • RUSSOM
    Where can i find toyota sequoia immobilizer unit?
    4 months ago
  • isaias simon
    Where is the ecu immobilizer located in 2005 sequoia?
    1 month ago

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