8428862-8428860-8428873-8428875-8428858-8428866

Component Location

General Description

The ECM and the SMARTRA communicate by dedicated line. During this communication of ECM and SMARTRA, the K line of ECM cannot be used for communication. The 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 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 ECM ※ Protocol layer violation - Invalid request - 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.