P1691

DTC P1691 IMMOBILIZER-ANTENNA COIL ERROR

Component Location:

GENERAL DESCRIPTION
This wireless communication runs on RF (Radio frequency of 125 kHz). The antenna coil is mounted on the top of ignition lock for RF transmission and receiving. The RF signal from the transponder received by the antenna coil is converted into messages for serial communication by the SMARTRA device. And the received messages from the ECM are converted into an RF signal, which is transmitted, to the transponder by the antenna.

DTC DESCRIPTION
The ECM sets DTC P1691 if there's any fault in immobilizer antenna coil.

DTC Detecting Condition:

Diagnostic Circuit Diagram:

MONITOR SCANTOOL DATA
1. Connect scantool to Data Link Connector (DLC).
2. IGN "ON" & Engine "OFF"
3. Monitor the "ECU, KEY and Smartra STATUS" Parameter on the Scantool.

Specification : "LEARNT"






4. Have "ECM, KEY and SMARTRA" status been learnt?

YES - Check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, damage on the ECM or SMARTRA.
And This DTC has not been erased in previous repair. Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.

NO - Go to "Component Inspection" procedure.

COMPONENT INSPECTION
1. Check coil antenna
1. Ignition "OFF"
2. Disconnect SMARTRA connector.
3. Measure resistance between antenna coil (+) and (-) terminal of SMARTRA harness connector.

Specification : Approx. 8.5 Ohms

4. Is the measured resistance within specifications?

YES - Go to "Check SMARTRA" procedure.

NO - Check for open or short in antenna coil. Repair as necessary and go to "Verification of Vehicle Repair" procedure.

2. Check SMARTRA
1. IGN "ON" & Engine "OFF"
2. Neutralize Both "SMARTRA" and "ECM" and Register transponder key with scantool.

NOTE: Pin code is required to Neutralize SMARTRA and to Register transponder key

3. Are Neutralizing and Registering completed normally?

YES - Perform all the key teaching procedure with scantool. (All the keys must be retaught) and then, go to "Verification of Vehicle Repair" Procedure.

NO - Substitute with a known-good transponder and perform the key teaching procedure.
If the problem is corrected, replace transponder and then go to "Verification of Vehicle Repair" procedure.

VERIFICATION OF VEHICLE REPAIR
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and se let "Diagnostic Trouble Codes (DTCs)" mode and then clear DTC.
2. Operate the vehicle and monitor the DTC on the scantool.
3. Are any DTCs present?

YES - Go to the applicable troubleshooting procedure.

NO - System is performing to specification at this time.