Problems with the Nissan Murano immobilizer 2005

Good morning, for everyone, Mario Villagrán, well my problem is as follows. I have a Nissan Murano, I had a leak in the box, the engine was taken, the cash retain, plus a bieléta, a motor support, then the mechanic who saw it first could not throw it away anymore, it was delivered to a service in Chile, which are experts and authorized of the Nissan in Chile, then it starts perfectly, but after the motorcycle is turned off, the immobilizer is blocked But, you have to disconnect the battery, then part. If someone had this problem please advise. thank you

Nissan Murano, year 2005, line top, starts but when the engine is blocked the immobilizer and no, it starts, when the battery is disconnected you can start again, if someone has had this problem, please advice, thanks.