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 |
Check transponder and ECU status
IGN "ON" ＆ Engine "OFF"
Monitor the "KEY STATUS" and "ECU STATUS' Parameter on the Scantool.
Specification : 'LEARNT'
Are "KEY STATUS" and "ECU STATUS' Parameter within specifications?
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
Go to "Check transponder" procedure
Check ECM
IGN "ON" ＆ Engine "OFF"
Neutralize ECM and Register transponder key by scantool.
Pin code is requied to Neutralize ECM and to Register transponder key
Are Neutralizing and Registering completed normally?
Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
Substitute with a known-good ECM and check for proper operation.
If the problem is corrected, replace ECM and then go to "Verification of Vehicle Repair" procedure.
ECM substitued for old one must be in "Virgin" or "Neutral" status and Pin code is requied to Neutralize ECM and to Register transponder key
After a repair, it is essential to verify that the fault has been corrected.
Connect scantool and selet "Diagnostic Trouble Codes(DTCs)" mode and then clear DTC.
Operate the vehicle and monitor the DTC on the scantool.
Are any DTCs present?
Go to the applicable troubleshooting procedure.
System is performing to specification at this time.
