Antitheft and Alarm Systems: Description and Operation

System Diagram:

SYSTEM DIAGRAM

DESCRIPTION

The engine immobilizer system has been designed to prevent the vehicle from being stolen. This system uses a transponder key ECU that stores the key code of the authorized ignition key. If an attempt is made to start the engine using a non-authorized key, the transponder key ECU sends a signal to the ECM to prohibit fuel delivery and ignition, effectively disabling the engine.

NOTE: After replacing the transponder key ECU, the engine will not start if the ignition switch has been repeatedly turned on/off more than 20 times before performing the communication code initialization process.
The engine will start only when the transponder key ECU is replaced with a new one.