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

In case of Smart Key Unit immobilizer function is locked, the Smart Key Unit answer is the no release message.PCM enters in the locked state, which causes theactivation of the imobilization actions of the engine.In case of Smart Key Unit immobilizer function state is released, the Smart Key Unit answer is the release message, including the information Smart Key Unit inlearnt mode and the PIN code.