Information related immobilizer,that are classified as 2(two) parts independently, is memorized in EEPROM. ECM/PCM check these 2(two) information berfore proceeding immobilizer authentication. With synchronized both information, ECM/PCM starts immobilizer authentication procedure. If both information is not synchronized, ECM/PCM stops immobilizer authentication, Limphome function will not be activated, and memorizes DTC P1695. If DTC P1695 is retrieved again, after performing new key teaching procedure, ECM/PCM should be replaced with new one.

If key/password information in ECM/PCM is not matching or there is write error on EEPROM as hardware, DTC P1696 is set.

Fig.1) It shows that ECU is learnt status.