This wireless communication runs on RF (Radio frequency of 125 kHz). The SMARTRA is mounted at the ignition lock close to the antenna coil 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 EMS are converted into an RF signal, which is transmitted, to the transponder by the antenna.
The ECM sets DTC P1691 if there’s any fault in immobilizer antenna coil.
Item
Detecting Condition
Possible Cause
DTC Strategy
? Open Circuit in antenna coil
? Short Circuit in antenna coil
? Faulty antenna coil
Enable Conditions
? IG ON
Threshold value
Detecting time
FAIL SAFE