TD5 IMMOBILISER BYPASS  

FOR A TD5 ENGINE TO RUN THE ENGINE ECU REQUIRES A SIGNAL THAT IS SENT FROM THE BODY CONTROL UNIT (BCU OR 10AS UNIT IF DEFENDER) 

THE BCU WILL ONLY SEND THIS SIGNAL IF THE ALARM IS DISARMED AND THE CORRECT KEY IS IN THE IGNITION. 

THIS BOX WILL IMITATE THAT SIGNAL SENT FROM THE BODY CONTROL UNIT TO THE ECU THEREFOR TRICKING THE ECU THAT THE ALARM IS NOT ACTIVATED AND ALLOWING THE ENGINE TO RUN EVEN IF THE BCU IS NOT CONNECTED. 

 YOU WILL NEED TO DO A LEARN CODE WITH NANOCOM OR ANOTHER DIAGNOSTIC DEVICE, BUT THIS WILL ONLY NEED TO BE DONE ONCE. 

THE DEVICE NEEDS AN IGNITION 12V LIVE AND A NEGATIVE SUPPLY. 

AND ONE WIRE (SIGNAL OUTPUT) CONNECTS TO PIN 34 ON THE BLACK ECU PLUG.

FOLLOWING LINK EXPLAINS HOW IT WORKS

https://youtu.be/IGZHOubpf_M