Engine Immobilizer Systems: Operation

Transponder chip is incorporated into grip area on ignition key. When ignition key is inserted into ignition lock cylinder, Engine Control Module (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 ignition key identification code signal to ECM. ECM compares received ignition key identification code signal to identification code stored in ECM. If ignition key identification code and identification code in ECM match, ECM will allow fuel injector operation and ignition system operation. If ignition key identification code and identification code in ECM do not match, ECM will not allow fuel injector operation and ignition system operation.

Engine immobilizer system is set each time ignition key is removed from ignition lock cylinder. When engine immobilizer system is set, SECURITY indicator light will flash once every second to indicate system is set. SECURITY indicator light is located on instrument panel, above air conditioning controls. For information on programming of ECM and ignition key identification key codes, see IGNITION KEY REGISTRATION  under PROGRAMMING. If a problem exists in engine immobilizer system, a Diagnostic Trouble Code (DTC) may be stored in ECM. Malfunction Indicator Light (MIL) on instrument panel will not come on.