The PCM/ECM controls the engine, in a normal way for starting and running, and starts communication with the Smart Key ECM, sending a PIN request to the Smart Key ECM and waiting for valid release message from it until the release time period has ended.

In case of Smart Key ECM immobilizer function is locked, the Smart Key ECM answer is the no release message.

PCM/ECM enters in the locked state, which causes theactivation of the imobilization actions of the engine.

In case of Smart Key ECM immobilizer function state is released, the Smart Key ECM answer is the release message, including the information Smart Key ECM inlearnt mode and the PIN code.