repairing Bosch jetronic box for volvo 240

Discussion in 'Volvo 240' started by FDB, Dec 4, 2007.

  1. FDB

    FDB Guest

    Has anybody got experiences in repairing the bosch jettronic computer box
    outof a 91 240.
    The computer does not seem to make the fuel pump work. The relais is ok. The
    car runs fine with another box.
    type is 0 282 000 561
    any help is welcome
    FDB, Dec 4, 2007
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  2. FDB

    James Sweet Guest

    I've never seen one fail, but I would look for cracked solder joints on the
    board. I fixed a Bosch ECU from a VW once that had a shorted filter
    capacitor just after the voltage regulator on the board.
    James Sweet, Dec 5, 2007
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  3. FDB

    FDB Guest

    hi James,
    I have opend the box but all connections are double soldered. I couldn't
    find any "exploded" parts or so. A electronic scheme would be most helpfull,
    FDB, Dec 5, 2007
  4. FDB

    Glenn Klein Guest

    Even @ the dealer level we do not have any access to any wiring diagrams
    for the Bosch computers the original problem is that the fuel computer
    is not making a ground point causing no fuel pressure the only fix that
    I know of is to purchase an exchange unit from a Volvo dealer or from
    your local junk yard
    Glenn Klein, Dec 5, 2007
  5. FDB

    James Sweet Guest

    You won't find any data like that, you're on your own for troubleshooting.
    The circuit is usually fairly simple though, if you trace the pin for the
    fuel pump relay from the connector it'll probably go almost straight to the
    collector of a transistor with the emitter grounded. That transistor may be
    bad, they can be tested with the diode test function of a decent DMM or you
    can try just replacing it. Low power electronics usually do not fail in any
    visible way, you have to test the components electrically.
    James Sweet, Dec 6, 2007
  6. FDB

    Mr. V Guest

    They're dirt cheap at the U Pull It.

    Why go through the hassle of learning to repair, when a new one can be
    easily found and cheaply purchased?
    Mr. V, Dec 6, 2007
  7. FDB

    James Sweet Guest

    Well the reason I do it is because I can, sure if you need the car running
    *now* just go buy another box, but if you wanna learn something and get an
    added sense of satisfaction, crack into it and attempt a repair. I get a
    kick out of doing things that few people are capable of doing.

    There's no good economic reason why I recently spent 3 hours repairing a 14
    year old 17" CRT monitor, or replaced a dozen surface mount capacitors and
    scraped corrosion off the motherboard from an ancient Mac SE/30, but in both
    cases it was a success, and keeps some still useful if obsolete equipment
    out of the landfill.
    James Sweet, Dec 6, 2007
  8. FDB

    Mr. V Guest

    Well, fine, if that is your cuppa joe.

    But the OP seemed to be looking for an immediate solution.

    They are about five bucks at the U Pull It.
    Mr. V, Dec 7, 2007
  9. FDB

    James Sweet Guest

    Prices vary widely, they're around 40 bucks out here, but either way, dirt
    cheap compared to new.
    James Sweet, Dec 7, 2007
  10. FDB

    FDB Guest

    Over here they are also cheap. Just one small detail, you can hardly find
    Here every volvo that more or less has 4 wheels is exported to Afrika. Spare
    parts are getting scarse for that reason.
    So if somebody could help me to send me a couple, i'll be most interested.
    Mr V?
    FDB, Dec 7, 2007
  11. FDB

    Mr. V Guest

    I guess I'm spoiled, living in metro Portland, Oregon.

    There are several U Pull Its to go to, plus other "regular" wrecking
    yards, and one or two that specialize in Volvo.

    I have gone to U Pull It Damascus and paid five bucks or so for them,
    just to have a spare (for K-Jet).

    Portland is the West Coast Lair of the Volvo, given the plethora of
    Volvo driving hippies out here.

    Yeah, I am spoiled.
    Mr. V, Dec 7, 2007
  12. FDB

    Nightmare Guest

    There is one more thing about it too:)
    If people did like you do,try to learn and repair they would not be totally
    helpless when cars or other stuff fail to work.
    In the future your skills will be most wanted,promise,cause if the trend of
    today continue not anyone will know how to fix things,just replace them with
    overvalued new items with lower quality.

    So you have an advantage and in long term it is economical effective as
    Nightmare, Dec 7, 2007
  13. FDB

    Glenn Klein Guest
    Glenn Klein, Dec 7, 2007
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