In immobilizer system, scantool is mainly used for diagnosis. besides this, registration of key and neutralization of ECM is executed by scantool. For ECM communicate with other components such as SMARTRA and scantool by changing type of communication through just one line, K-line communication between scantool and ECM is unavalible while communication between ECM and SMARTRA is in progress.
The ECM sets DTC P1696 if Request from Tester is Invalid.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Invalid request - Protocol layer violation - Check sum error | |
Enable Conditions | ● IG ON | |
Threshold value | ||
Detecting time | ||
FAIL SAFE |
Connect scantool to Data Link Connector(DLC).
Ignition "ON" ＆ engine "OFF".
Selet "Diagnostic Trouble Codes(DTCs)"mode and monitor "DTC Status" parameter
Is the DTC B1697 present?
Go to "Inspection ＆ Repair" procedure.
Fault is intermittent caused by poor contact in SMARTRA's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly 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.
Check communication between ECM and scantool
IGN "ON" ＆ Engine "OFF"
Connect scantool to Data Link Connector(DLC).
Erase the DTC and Monitor Parameter of immobilizer on the Scantool.
Try one more time from "select car model " even if "Communication error" is present on the scantool.
Is the communication between ECM and scantool normal?
If ECM is in "Locked by Timer" status. Keep "KEY ON" status for 1 hours to withdraw "Locked by Timer" status. Then repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
Substitute with a known-good scantool and check for proper operation.
If the problem is corrected, Go to "Verification of Vehicle Repair" procedure.
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.
