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NEWS FLASH: 933 ECU is a direct replacement for 566 ECU on 89 240!!! 200

posted by  someone claiming to be tjts1 on  Tue Apr 12 14:34 CST 2005 [RELATED]

So the 566 ECU was busted after all. The closest thing I could find at the JY was a 91 740 NA with 160k miles and a 933 ECU. Out of desperation I bought it and hoped for the best. When I first tried the new ECU the engine still wouldn't fire. Then I found a blown fuse in the engine bay. I thought DAMN I'm an idiot for not checking this fuse before I spent $30 on a new ECU. I reinstalled the old 566 ECU and replaced the FUSE. Engine fired for a split second then died again. DOH! The new fuse was blown yet again. As a last ditch effort, I installed the new 933 ECU and replaced the fuse for the second time. Engine fired on the first try and idle was smooth as butter. After driving the car for a nice 10 mile trip with the 933 ECU I wanted to double check the diagnosis. In went the old 566 ECU yet again. For the third time the fuse blew and no start! So I guess that's it then. The 566 ECU kills the fuse. I don't know why, I don't know how but the 566 likes to murder this fuse. On the bright side, my friend was right: Any LH 2.4 ECU will work on the 89 240. Maybe even a turbo ECU. Plus the engine is soo much smoother. I can't believe it. It really feels like a new car. Thanks to everyone for all your help.
Also a special thank to rhaire for making THIS very helpful ECU list.
Justin

Old 566 aftermarket ECU the previous owner installed.


The fuse in question


My new used 933 ECU from 91 740 in my 89 240. Who knew it would work?





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