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8G-2 IMMOBILIZER CONTROL SYSTEM
Immobilizer Control System Introduction
The immobilizer control system designed to prevent vehicle burglar consists of following components.
• Engine Control Module (ECM)
• Immobilizer Control Module (1) with coil antenna
• Ignition key (2) with built-in transponder
• Immobilizer indicator lamp (for self-diagnosis function)
Operation of this system is as follows.
i) Each ignition key has its own code (Transponder code) stored in memory. When the ignition switch is
turned ON, Immobilizer Control Module tries to read the Transponder code through the coil antenna
installed onto the steering lock assembly.
ii) Immobilizer Control Module compares the Transponder code read in Step (i) and that registered in Immo-
bilizer Control Module and checks if they match.
iii) When it is confirmed that two Transponder codes match each other as described above, Immobilizer Con-
trol Module and ECM check if ECM/Immobilizer Control Module codes registered in them respectively
match.
iv) Only when it is confirmed that ECM/Immobilizer Control Module codes match, the engine starts running. If
Transponder codes in Step (ii) or ECM/Immobilizer Control Module codes in Step (iii) do not match, ECM
will stop operation of the injector and ignition of spark plug.
Transponder
Code
3. Data link connector (DLC)
4. Immobilizer indicator lamp
5. ECM
NOTE:
For vehicle with a right-hand steering wheel, position of each component is symmetrical.
General Description
1
3
2
2
ii)
Immobilizer
i)
iii)
Control
Module
4
iv)
5
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