General Information

Immobilizer
P1676 Immobilizer-Smartra Message Error - General Information

Component Location





General Description

1. The sequences of the PIN code storage are as follows.
(1) Input the PIN code into the scanner when key teaching process.
he scanner transmits the Encrypted Code to the PCM after converting the PIN code into Encrypted Code.
(2) When the PCM gets the firtst key learning command, it transmits the SMARTRA3 learnt command and Encrypted Code to the SMARTRA3
(3) If the SMARTRA3 statue is virgin/neutral, the SMARTRA3 stores Encrypted Code in EEPROM and transmits the success message of the Encrypted Code storage.
(If the SMARTRA3 is learnt, the SMARTRA3 compares Encrypted Code transmitted by the PCM with Encrypted Code stored in EEPROM and transmits the (in)correct Encrypted Code message to PCM)
(4) If the SMARTRA3 is learnted normally or the Encrypted Code of the registered SMARTRA3 is the same as the PCM, the PCM begins operation the Transponder Learning.
(5) If the learning of the first transponder, the PCM stores the Encrypted Code in its EEPROM and converts state into learnt state.
2. The SMARTRA3 learning :
(1) starts with EMS request of PIN from scanner through the key teaching procedure.
(2) is possible in case that the status of SMARTAR is "virgin" or "neutral".
(3) In case that the SMARTRA3 is "learnt", the SMARTRA3 will transmits the information if PIN inputted from scanner is same as the PIN in SMARTRA3.
(4) is possible regardless of key status.
3. The sequence of the SMARTRA3 confirms are as follows.
(1) After communication with the SMARTRA3, the PCM transmits the random number with requirement of the TP ID information.
(2) The SMARTRA3 encryptes the random number and transmits the result(Encrypted Random Number) to the PCM with TP ID information.
(3) The PCM compares the result transmitted from the SMARTRA3 with the result calculated by PCM.
And If result are coincided with each other; the ECS concludes the valid confirmation of the SMARTRA3.

DTC Description

The PCM sets DTC P1676 if there's any fault in message from SMARTRA to ECU

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data




Fig.1) A normal signal waveform of antenna and immobilizer communication when IG key(TP : Transponder) is OFF to ON.