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#2 Fuel injector signal dead. 900 1991

posted by  bricker4ever on  Sat Mar 31 13:15 CST 2018
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last visit: Fri Feb 21 18:02 CST 2014
[RELATED]

Hello all, ''91 940se
#2 Fuel injector is not receiving a signal from the ecu.
Plug seems to be dead when tested with ohm meter.
What to do?








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    #2 Fuel injector signal dead. 900 1991

    posted by  Amarin on  Sat Mar 31 15:37 CST 2018
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    last visit: Thu Oct 23 22:42 CST 2014
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    Have you switched the plug from another injector to the so-called-faulty injector to test if its the injector itself or the plug connection thats defective. Look for "pushed-in" terminals inside the injector plug too. These could be repaired. Whats the condition of the injector wire? Any breaks in insulation etc?

    The wiring scheme is that ALL injectors share the same signal from ECU. In the ECU there is only one transistor (not MOSFET, yes I've studied several 900 series ECU) driving ALL the injectors simultaneously. The injector plug connections are interchangeable only limited to wire lengths.

    Regards,
    Amarin.








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      #2 Fuel injector signal dead. 900 1991

      posted by  Fredneck Tom on  Thu Apr 19 09:13 CST 2018
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      Don't know diddly about 900 ECUs, but that makes no sense to me as some cylinders would be getting a squirting on the exhaust stroke. Sounds like a lot of backfiring and waste of gas. Tom








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        #2 Fuel injector signal dead. 900 1991

        uid 27's pic
        posted by  Art Benstein on  Thu Apr 19 09:52 CST 2018
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        last visit: Fri Oct 17 20:10 CST 2014
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        "Don't know diddly about 900 ECUs, but that makes no sense to me as some cylinders would be getting a squirting on the exhaust stroke. Sounds like a lot of backfiring and waste of gas. "

        Yup, Amarin is correct on all points for both Bosch and Regina fuel. Batch injection works smoothly, and it takes some thought to counter the intuitive.
        --
        Art Benstein near Baltimore

        “Never underestimate the difficulty of changing false beliefs by facts.” --- Henry Rosovsky

        Henry Rosovsky was a longtime Harvard professor and administrator. An expert in Japanese economic history, the elder Rosovsky was chair of the economics department from 1969 to 1972 and served as dean of the Faculty of Arts and Sciences from 1973 to 1984 and again from 1990 to 1991.








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          #2 Fuel injector signal dead. 900 1991

          posted by  Fredneck Tom on  Fri Apr 20 05:47 CST 2018
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          OK Art, still don't know diddly about 900 FI as I have a super simple 544. After putting the old gray matter to work for awhile, I figured the injectors are in the head UNDER the intake valves...that would work if all fired at the same time as only one intake valve is open at any given time. I was thinking direct injection.
          Thanks for putting my brain to work. With a 544 I just have fun...don't have all the relays, computers and wiring to worry about. Tom







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