General Information

Smart Key Unit
B1625 EMS Communication Data Failure - General Information

Component Inspection





General Description

SMK unit communicates with ECM/PCM through the serial communication line. If ECM/PCM requests authentication from SMK unit after IG ON, SMK unit check authentication with transponder then, sends this signal to ECM/PCM whether authentication is O.K or not.

DTC Description

This DTC code is to determine proper communication of ECM/PCM and SMK Unit when engine is started.The DTC is set If there is problem with data sent from ECM/PCM to SMK unit such as check sum error, Data Frame error, ID Unknown error, Data length error and Time out error.

DTC Detecting Condition





Diagnostic Circuit Diagram





Signal Waveform & Data