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/PCM receives information from the ICM and permits injection to take place If the CODE memorized in ECM/PCM 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/PCM.
The ICM sends a START or NO START signal to the ECM/PCM.

DTC Description

The DTC will set, there is no data transmitted from ECM/PCM 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.