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Component Location

General Description

The PCM/ECM and the SMARTRA communicate by dedicated line. During this communication of PCM/ECM and SMARTRA, the K line of PCM/ECM cannot be used for communication. The PCM/ECM controls the communication either to SMARTRA or to other devices(e.g. scanner) on K line by switching of a multiplexer and specific communication procedures. The multiplexer is a part of PCM/ECM H/W.

DTC Description

The ECM sets DTC P1694 if Request from EMS is invalid.

DTC Detecting Condition

Item	Detecting Condition	Possible Cause
DTC Strategy	• -	1. Faulty PCM/ECM ※ Protocol layer violation 2. Invalid request 3. Check sum error
Enable Conditions	• IG ON
Threshold value	• Protocol layer violation • Invalid request • Check sum error
Detecting time	• -
FAIL SAFE	• -

Diagnostic Circuit Diagram

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Signal Waveform & Data

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