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P1691 Immobilizer-Antenna Coil Error

AutoHex Online Help: Hyundai i30(GDe) 2013
Component Location

1.TP(Transponder)

2.Antenna Coil

General Description

This wireless communication runs on Radio frequency. 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 Immobilizer unit. And the received messages from the ECM are converted into an RF signal, which is transmitted, to the transponder by the antenna. Coil antenna provides energy to the transponder key and retrieves signal from the transponder and send it to Immobilizer unit.



DTC Description

The PCM/ECM sets DTC if there is any open or short circuit between the antenna coil and Immobilizer unit

DTC Detecting Condition

Item

Detecting Condition

Possible Cause

DTC Strategy

­Data status receiving from transponder

Open or short circuit in antenna coil

Faulty antenna Coil

Faulty ICU

Threshold value

Open or Short circuit

Detecting time

1 time

DTC Erasing

Condition

Without a fault during 30 trips or using a GDS

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.