P1691

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. IG "ON" & Engine "OFF"
3. Monitor the "ECU, KEY and Smartra STATUS' Parameter on the Scantool.

Specification :'LEARNT'





Fig1) This data show that 3 keys have been taught, ECU has been learnt, Key in key cylinder has been learnt and SMARTRA3 has been learnt
4. Has the "Smartra STATUS' been learnt ?






Component Inspection

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

Specification :Approx 8.5 Ohms


(4) Is the measured resistance within specifications?





2. Check SMARTRA
(1) IG "ON" & Engine "OFF"
(2) Neutralize Both "SMARTRA" and "ECM" and Register transponder key by scantool.

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

(3) Are Neutralizing and Registering completed normally ?






Verification of Vehicle Repair

After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "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?