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What ecu should I have? 700

posted by  dtom4 on  Tue Jan 31 09:55 CST 2006
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ok-I'm confused. Car is an 89 740T Wagon. It's got an 007 AMM and hall sensor so its an LH-2.2. I've had a serious fuel consumption issue which I still havn't tracked down after replacing just about everything related to fuel. I have a 541 ecu in the car and someone from another list says the 541 in for an LH-2.4. They also say it is a problematic unit. I have read somewhere that 89 740T's came with the 541. But I also see people selling all sorts of used ecu's they says is for the 740, LH 2.2, b230. Ecu's listed are 544,554,507, etc etc. Is there a source that has definative info on which ecu's came with which cars? I bought the car used with 180K and no idea of its service history so anything is possible. It came with an ect installed for a LH-2.4 but strangely replacing it with the correct one did nothing, good or bad. Also is the 541 problematic and if so is there a replacement? TIA

Dave
--
Dave 89 740T Wagon 178K








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    What ecu should I have? 700

    posted by  dtom4 on  Tue Jan 31 10:30 CST 2006
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    Thanks for all the responses. Makes me feel much better knowing I have the correct one and that its reliable.
    --
    Dave 89 740T Wagon 178K








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      What ecu should I have? 700

      posted by  rhaire on  Wed Feb 1 04:13 CST 2006
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      last visit: Mon Aug 4 10:16 CST 2014
      [RELATED]

      Keep it in mind though, anything can fail. All ECU's have given someone a problem at some time. The fact that Volvo came out with the 591 upgrade (for the 541) means something. The upside is that if you wanted to try swapping the ECU (I would), it is pretty easy to find in pick and pull yards, or pretty cheap to buy, used. Just wanted to tell you not to overpay for this ECU and don't count on it to be the answer. For me, the $30 cost is worth it to cross it off the list of things to consider.








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        What ecu should I have? 700

        posted by  dtom4 on  Wed Feb 1 06:42 CST 2006
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        Thanks again for the suggestion. I am planning on picking one up for test purposes but as you say I don't really expect it to be the answer. I like having an extra one around though as a spare. There are no pick and pulls around me so I've been browsing Ebay. Seems like I can pick one up around the $30 price range you mention which is pretty reasonable for the peice of mind.
        --
        Dave 89 740T Wagon 178K








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    What ecu should I have? 700

    posted by  NJC on  Tue Jan 31 10:08 CST 2006
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    last visit: Sun Jul 24 13:42 CST 2011
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    Hi Dave, I have identical wagon and it also has 541 ECU. I don't have any direct experience with problems with this ECU but anecdotal observations here at Brickboard would say this model is fine.
    ---
    Norm Cook; Vancouver BC; 1989 745T 212,000KM








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    What ecu should I have? 700

    posted by  rhaire on  Tue Jan 31 09:59 CST 2006
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    541 is correct and it is generally not problematic. You can tell by the used market, the problem ECUs bring ~$100 and the good ones, 10-25. Yours is one of the latter. You are confusing turbo with NA in LH 2.2 and the same in LH 2.4. The four groups use different ECUs. Turbo ECUs do not drive well in non-turbo cars.







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