Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Circuit Description

Circuit Description
The Immobilizer Control System (ICS) is an anti-theft device that enables
starting to be possible only when the mechanical and wireless secret code (memorized in the ECM and SMATRA), are aligned simultaneously.The transponder (built -in the ignition key head) sends a unique frequency code signal to the SMATRA (SMART TRansponder Antenna).

The SMATRA compares the received signal with the memorized code and communicates with the ECM, controls the engine management system through fuel injection control, via a dedicated communication line. When the code is aligned, the ECM sends a starting signal and the engine starts.