Immobilizer System Description

Immobilizer System Outline
- The immobilizer system prevents the engine from starting when anything other than the programmed ignition key is used. (even if the ignition switch is short-circuited. If unprogrammed key Is used the PCM will cut the fuel and ignition.)

- The system components are:
- Key with transponder
- Security light
- Coil
- Immobilizer unit
- PCM

- The engine will start only if the key with the corresponding identification number is recognized and verified by the PCM and immobilizer unit.
- The engine can be started using the key, which has and ID number registered in its transponder and which uses an algorithmic verification method.
- *Code word is input into the immobilizer unit and PCM, and the vehicle will not start if the code word is not newly registered when parts (i.e. PCM) are replaced.
- *The procedure for registering the ID number and the procedure for inputting the code word are different according to the parts being replaced and the number of the registered keys.

*:These are very important outlines for the Immobilizer system.

Immobilizer System Structural View:

Immobilizer System Structural View

Immobilizer System Description

Key
- The transponder the. key has a registered ID number and performs an algorithmic transaction.

Coil
- The coil is located in the steering lock.

Immobilizer unit
- The immobilizer unit compares the ID number and the algorithmic verification method of the key with those registered in the immobilizer unit.
- When the ID number and the algorithmic verification method are verified, the immobilizer unit sends the code word to the PCM.
- When there is a malfunction in the immobilizer system, the immobilizer unit flashes the security light to indicate a malfunction.

PCM
- The PCM verifies the code word from the immobilizer unit with that stored in PCM memory.

System operation:

System operation