Finally got the codes-any ideas?

Discussion in 'General Motoring' started by mrichards, Feb 6, 2007.

  1. mrichards

    mrichards Guest

    Finally got around to having the codes read and below is the history.
    The symptoms I have been having are the sevice eng. light coming on for
    awhile during a trip. Sometimes, not each time the light came on, the
    eng. would skip or misfire, I would get a whiff of raw gas briefly in the
    car. The sevice eng.light would go out and maybe not come on for another
    day or so. Gas mileage has suffered also.
    Below is the exact code as printed. Any help would be greatly appreciated.
    TIA,
    MR
    -------------------------------------------------------------------------------------------------------------
    Vehicle Scanned
    1997 SL1
    7=1 . 9L PFI

    Set DTCs (codes)

    History DTC P0203
    Injector Circuit
    Open
    Cylinder 3
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F

    History DTC P0303
    Cylinder 3
    Misfire Detected

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F


    History DTC P0503
    System Voltage
    Low

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P1599
    Engine Stall Or
    Near Stall Detected

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P1624
    PCM RAM
    Performance

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P0605
    PCM
    Read Only Memory
    (ROM) Error
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F

    History DTC P0656
    Fuel Level
    Output
    Circuit Malfunction
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F
     
    mrichards, Feb 6, 2007
    #1
  2. mrichards

    Oppie Guest

    Cylinder #3 Injector circuit open. Look for a open coil on the injector, a
    flaky connection or dammaged wire.Trace the connections all the way back to
    the ECU (which drives the injectors). could be intermittent which will drive
    you crazy. Many of the other codes may be related to one cylinder not
    working because of no fuel.

    The other thing that stands out is low system voltage. check that your
    battery voltage is about 12V engine off and 13.8V engine running.

    The ROM error and fuel circuit error may be related to low battery issues.
    (just a wild guess)

    Oppie


    Finally got around to having the codes read and below is the history.
    The symptoms I have been having are the sevice eng. light coming on for
    awhile during a trip. Sometimes, not each time the light came on, the
    eng. would skip or misfire, I would get a whiff of raw gas briefly in the
    car. The sevice eng.light would go out and maybe not come on for another
    day or so. Gas mileage has suffered also.
    Below is the exact code as printed. Any help would be greatly appreciated.
    TIA,
    MR
    -------------------------------------------------------------------------------------------------------------
    Vehicle Scanned
    1997 SL1
    7=1 . 9L PFI

    Set DTCs (codes)

    History DTC P0203
    Injector Circuit
    Open
    Cylinder 3
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F

    History DTC P0303
    Cylinder 3
    Misfire Detected

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F


    History DTC P0503
    System Voltage
    Low

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P1599
    Engine Stall Or
    Near Stall Detected

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P1624
    PCM RAM
    Performance

    MIL NOT REQUESTED
    Since IGN NOT RUN
    Since Clear P/F

    History DTC P0605
    PCM
    Read Only Memory
    (ROM) Error
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F

    History DTC P0656
    Fuel Level
    Output
    Circuit Malfunction
    MIL NOT REQUESTED
    Since IGN PASS
    Since Clear P/F
     
    Oppie, Feb 6, 2007
    #2
  3. mrichards

    mrichards Guest

    Snip
    Thanks a bunch for the info.
    The low voltage may have been due to a bad belt that I changed just before
    Christmas. The belt was starting to squeel and was hard and cracked when
    I replaced it. The gas mileage returned to near normal after replacing
    the belt which was a mystery, but now has dropped somewhat again.
    I will check out the connections as you suggested. I will also reset the
    codes. I think reset is done via pulling the neg. battery terminal?
    Thanks again,
    MR
     
    mrichards, Feb 6, 2007
    #3
  4. mrichards

    Doug Miller Guest

    Pulling the negative battery terminal will reset a lot of other things too,
    things you way not want set (like the theft-deterrent system on the stereo).

    The proper way to reset the codes is with the same tool you use to read them.
    You can get that done for free at most major auto parts stores.
     
    Doug Miller, Feb 7, 2007
    #4
  5. mrichards

    mrichards Guest

    Thanks. I'll stop by and have them do that.
    MR
     
    mrichards, Feb 7, 2007
    #5
  6. mrichards

    Oppie Guest

    Simple ECU code reset on the L-series is by pulling the Controls B+ fuse for
    10 seconds from the uhfp (Under hood fuse panel). Can't say if that will
    also work with any other model.
    Harbor freight has a very simple code reader that will also reset codes
    http://search.harborfreight.com/cpisearch/web/search.do?keyword=code+reader

    I'd prefer a scan tool that reads data streams but those are **much** more
    expensive. Still at the prices for the simple readers (About cost of a tank
    of gas), are within everybody's reach.

    btw - if you are 'allergic' to repair shops, by all means obtain a shop
    manual for your vehicle or buy a subscription to www.Alldata.com Both are
    well worth the investment and even if you don't do your own repairs, gives
    you enough background to make informed choices.

    Oppie
     
    Oppie, Feb 7, 2007
    #6
  7. mrichards

    mrichards Guest

    I checked the wires on no. 3 injector which the code pointed to and all
    looked good from the top end. I noticed that the wires were resting on
    top of a bolt that has sharp edges which is on the fuel rail. After
    removing the elect. plug from the injector and looking under the wires I
    found a worn/burned spot in one of the wires and looked as if it had been
    arcing. Taped the wires good and put some rtv on bolt head to smooth it
    over.
    I guess that was what was causing the misfire and gas smell and perhaps
    the drop in gas milage.
    Many thanks for the direction Oppie. Saved me a ton of time and money.
    I do have a set of manuals and use them for disassembly etc. mostly, but
    have not helped me much on trouble shooting. Can't beat experience when
    it comes to that.
    Many thanks again,
    MR
     
    mrichards, Feb 7, 2007
    #7
  8. mrichards

    Oppie Guest

    Glad to help! I've done these sort of wire chaffing repairs in the past. I
    usually am a bit more thorough in that I either apply a shrink sleeve over
    the chaffed wires (requires cutting and splicing) or apply a good coating of
    RTV, let it dry for a few hours and then tape over. Degrease wires before
    using RTV or it won't stick. Tape has a way of coming off and letting in
    grunge that will rot the conductors. Granted that I'm a bit obsessive but I
    used to work on Military electonics. Would really mess with your day if some
    of that stuff went wrong.

    Oppie


    I checked the wires on no. 3 injector which the code pointed to and all
    looked good from the top end. I noticed that the wires were resting on
    top of a bolt that has sharp edges which is on the fuel rail. After
    removing the elect. plug from the injector and looking under the wires I
    found a worn/burned spot in one of the wires and looked as if it had been
    arcing. Taped the wires good and put some rtv on bolt head to smooth it
    over.
    I guess that was what was causing the misfire and gas smell and perhaps
    the drop in gas milage.
    Many thanks for the direction Oppie. Saved me a ton of time and money.
    I do have a set of manuals and use them for disassembly etc. mostly, but
    have not helped me much on trouble shooting. Can't beat experience when
    it comes to that.
    Many thanks again,
    MR
     
    Oppie, Feb 7, 2007
    #8
  9. mrichards

    mrichards Guest

    Right on the elec. connections. I have had a some real PIA elect.
    failures on travel trailer brakes. I used the shrink tubing and rtv on
    those when I did a complete brake job.
    I would have done a little better job on the injector wires, but there was
    not very much wire length from wiring harness to plug on injector which is
    what caused the worn spot in the first place. Also, no. 3 is a bitch of
    an area to get to and could only work with my finger tips since my hands
    are a little to large to get in that area without removing the throttle
    cable.
    Many thanks again for your input.
    MR
     
    mrichards, Feb 8, 2007
    #9
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