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03-120 3) Immobilizer Ignition Key Verification When turning the ignition key to the ON position, the power is supplied to the immobilizer unit and EMS (ECU). The ECU communicates with the immobilizer unit to verify the key and transponder. If it is valid, the ECU starts to control the engine or immobilizer indicator (illumination or flashing) when the ignition key is turned to the START position. Once the key is verified, valid key verification time is provided for 10 seconds and the engine can be started by turning the ignition key to the engine START position during this verification time. If the ignition key is turned to the START position again after the 10 seconds of verification time, the key verification should be reperformed. When the ignition key is inserted, the immobilizer unit requests the transponder verification through the antenna. The transponder sends the encrypted message to the immobilizer control unit. The immobilizer unit compares the encrypted message received from the transponder to the coded value through the logic circuit. If they are identical, it requests the transponder approval. When the ignition is turned ON, the EMS (ECU) requests immobilizer verification process through the P-CAN. The immobilizer control unit sends the encrypted message to the EMS (ECU). The EMS controls the engine normally when the coded value and the encrypted message sent from the immobilizer are identical. 1. 2. 3. 4. 5. 6. When the immobilizer verification has failed, the verification signal is sent again 3 times for 2 seconds, and the verification procedure is carried out up to 3 times by turning the ignition ON within 10 seconds. If the three re-verifications fail, verification procedure is stopped and will be restarted after 10 seconds. |