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Interchangeable ECUs? 200 1992

posted by  someone claiming to be Dharvey on  Thu Oct 31 13:36 CST 2002 [RELATED]

The mystery driveability problem on my 1992 240/b230f continues. A Volvo garage says testing another ECU on the car would either show that's the problem or rule it out. But they don't have a 556 unit for test.

My car has a 556 ECU, Volvo #3501687 (which I think means it's an LH 2.4 injection system instead of a 3.1). The parts guy at the local dealer says that I can go to a 933 (newer unit) but I would also have to replace the ignition module. Lots of $. There aren't any good PNP junkyards nearby, and it hurts to think of paying a "we-pull-it-and-gouge-you" junkyard $400 for a used 556 when I don't even know that is really what's wrong.

Are there any older units that will swap out with the 556?

Thanks for any help you can provide.

Doug Harvey






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