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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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    Interchangeable ECUs? 200 1992

    posted by  someone claiming to be Eric S. on  Thu Oct 31 15:59 CST 2002 [RELATED]

    By the way, both a 556 ECU (sold as-is, untested) is on eBay for $25.00 and a 933 is also available for $100 (tested)... Do a search for Volvo 556 and Volvo 933.

    Hope this helps..
    -Eric







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    Interchangeable ECUs? 200 1992

    posted by  someone claiming to be Eric S. on  Thu Oct 31 15:54 CST 2002 [RELATED]

    My '89 240 (LH 2.4) had a 561 ECU. I swapped it out with the interchangeable 951 ECU. It didn't fix the problems my car was having, but I kept the newer model (951) in there.

    The 561s and 951s should work with your car. I was able to get mine off of eBay for about $90 shipped. The last few that have been sold on there went for about $175.

    By what the posts say, the 561 replaced the 556, and the 951 supercedes the 561. Someone please correct me if I'm wrong.

    Here are two links for you:

    http://www.brickboard.com/RWD/index.htm?id=382741 (an archives discussion concerning the 556 ECU)

    and

    http://www.atpelectronics.demon.co.uk/Catalogue/volvo.htm (a reference guide for ECUs, etc..)

    Regards,
    Eric Staufer,
    '89 244DL 119k







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