SMK unit communicates with ECM/PCM through the serial communication line. If PCM/ECM 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.
This DTC code is to determine proper communication of PCM/ECM and SMK Unit when engine is started.The DTC is set If there is problem with data sent from PCM/ECM to SMK unit such as check sum error, Data Frame error, ID Unknown error, Data length error and Time out error.
Item
Detecting Condition
Possible Cause
DTC Strategy
Checking Data stauts receiving from PCM/ECM
Poor connection
Power supply circuit in Smartkey Unit
Signal noise in PCM/ECM data communication line
Smartkey Unit(SMK IMMO Unit)
PCM/ECM
Enable Conditions
Data that SMK unit received from PCM/ECM is error after IGN OFF to IGN ON
Threshold value
Received data error from PCM/ECM
Diagnostic Time
PCM/ECM detects data errors for 5 times
Immediately after receiving normal data