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561 ECU failure 200 1989

posted by  rstarkie on  Fri Apr 11 08:47 CST 2003
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last visit: Fri Oct 24 10:14 CST 2014
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I had a no start situation in one of our 89 240's. Substituting a known good fuel pump relay didn't help. Jumping fuse 4 to 6 caused the pump to run and the car to start. Substituting a 951 ECU from a running parts car cured the problem.

Can anyone share their 561 failure story? I'm wondering if this is the typical failure most people experience. I've been told the common failure results in a loss of ground to the fuel pump relay. Does jumping fuse 4 to fuse 6 provide that ground or am I just eliminating the fuel pump relay altogether when I jump the fuses? (I am electrically challenged) Thanks for any input.

It would seem that besides a resoldered fuelpump relay it might be a good idea to carry a short jumper wire with alligator clips for a quick "get me home" fix. Especailly if you are still running a 561 ECU. BTW mine failed at 162,000 miles.

Randy








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    561 ECU failure 200 1989

    posted by  Rludwick on  Fri Apr 11 13:06 CST 2003
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    last visit: Sat Aug 31 16:10 CST 2013
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    I replaced the eprom chip in mine while it was still good, as a precaution after I replaced all of the sensors in the car, and I keep the old good chip in the glove box, so if the thing ever poops out , it only takes about ten minuits to swap out the chip and be rolling again.
    --
    -------Robert, '90 240 wagon, '84 240 diesel , '80 245 diesel








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    561 ECU failure 200 1989

    uid 27's pic
    posted by  Art Benstein on  Fri Apr 11 09:46 CST 2003
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    last visit: Fri Oct 17 20:10 CST 2014
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    Oh, I forgot to address your question. The jumper at the fuse panel does get the relay out of the picture instead of supplying the relay ground.
    --
    Art Benstein near Baltimore








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    561 ECU failure 200 1989

    uid 27's pic
    posted by  Art Benstein on  Fri Apr 11 09:17 CST 2003
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    last visit: Fri Oct 17 20:10 CST 2014
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    Randy,

    I haven't had one fail yet. Actually used one to replace a failed 933 in my 89. But it would be good to find the reason for yours. I would be willing to try to analyze it for you. I traced the circuit for the fuel pump relay ground several times, because each time I wound up in a very delicate area of the ECU instead of something more likely to be used to drive a relay coil. Remains a mystery to me until I get hold of a bad one.

    --
    Art Benstein near Baltimore








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      561 ECU failure 200 1989

      posted by  mcduck on  Fri Apr 11 10:55 CST 2003
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      last visit: Sun Sep 9 11:47 CST 2012
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      I've heard that the TO-220 which pulls the relay to ground opens up; I haven't actually experienced it myself.








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        561 ECU failure 200 1989

        uid 27's pic
        posted by  Art Benstein on  Fri Apr 11 11:09 CST 2003
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        last visit: Fri Oct 17 20:10 CST 2014
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        That is just what I was looking for, although it wouldn't take anything as large as a TO-220 package to close a 120mA relay, I trace the pin back to the same hybrid used to condition the AMM output, and that makes no sense to me. In the earlier ECUs, the fuel pump driver transistor is discrete and large enough to handle the job and well protected against reverse EMF. I keep thinking I missed a track until I prove it goes there with an ohmmeter. Oh, well, if it is in the hybrid, its fragility is understandable.
        --
        Art Benstein near Baltimore







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