General Information

Immobilizer
P1678 Immobilizer-EMS No Request ( EMS data line open, no immo.) - General Information

Component Location





General Description

In the Ignition ON position, the ECM receives information from the ICM and permits injection to take place If the CODE memorized in ECM is coincided with ICM.
When the ID code from the transponder is verified by the ICM then the registering sequence is complete and a answer signal is sent to the ECM.
The ICM sends a START or NO START signal to the ECM.

DTC Description

The DTC will set, there is no data transmitted from ECM for 5 seconds after ignition ON.

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.