The ECM and the SMARTRA communicate by dedicated line. During this communication of ECM and SMARTRA the K line of ECM cannot be used for communication. The ECM controls the communication either to SMARTRA or to other devices(e.g. scanner) on K line by switching of a multiplexer and specific communication procedures. The multiplexer is a part of ECM H/W.
The ECM sets DTC P1694 if Request from EMS is invalid.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Faulty EMS ※ Protocol layer violation - Invalid request - Check sum error | |
Enable Conditions | ● IG ON | |
Threshold value | ||
Detecting time | ||
FAIL SAFE |
