Interchangeable ECU: '97 D90 and Disc...

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Author Message   Arthur Maravelis (Artm) New Member Username: Artm Post Number: 9 Registered: 06-2003 Posted on Thursday, October 30, 2003 - 10:06 am:    Can I fit a '97 Disco ECU (MKC104620 or ERR7377) into a '97 D90 NAS? That is, without any difference in function. Anyone know the difference between these two parts? -Arty Boston, MA   J E Robison Service Co (Robisonservice) Member Username: Robisonservice Post Number: 131 Registered: 10-2002 Posted on Tuesday, January 13, 2004 - 12:14 pm:    The ECUs can be interchanged. For best results you should swap the program chips or purchase the lastest version of the D90 EPROM. The difference is in the programming, which is contained in the chip. Also note that you cannot swap the ECU unless you have a Testbook or equivalent system to accomplish the security reprogramming. Even though the parts are interchangable they will require programming before they will work. And you will need to program again if you were to refit the ECU back into the Disco