Hi all I'm new here and hope this is in the right place , I've fitted my standard ecu and now the car want start it fires up and cuts out after 1 second and I have the immoblizer flashing on dash , soon as I fit the mapped ecu it starts again any help would be grateful 

Edited 20 August, 20178 yr by matty28

The mapped ecu has the immobiliser coded to the car, the other ecu doesn't so won't start, you need to get them programmed to work.