Need Some help with EFI Kohler PLEASEE!!

Discussion in 'Lawn Mowing' started by taylo708, May 28, 2010.

  1. taylo708

    taylo708 LawnSite Member
    from MI
    Posts: 51

    I just purchased a leftover 2009 turf tiger 61 with the 31hp EFI kohler. I was testing it out on my lawn tonight and the check engine or service light kept coming on then going back off again. I have no idea what can cause this light to come on? Only thing I have done is put fuel in it, but I use our fuel at the farm which has been sitting around for awhile. Should I be running a higher octane in this engine? It seems to be running great no complaints there just worried about it since this is the first day I have had it. Thanks for any help
     
  2. Blackhatch

    Blackhatch LawnSite Member
    Posts: 79

    87 octane should be fine.

    Check all the connections in the wiring harness first.
     
  3. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    Check and see if there are any fault codes present.

    1. Start with the key switch off.
    2. Turn the key switch on-off-on-off-on, leaving it
    on in the third sequence. The time between
    sequences must be less than 2.5 seconds.
    3. Any stored fault codes will then be displayed as a
    series of MIL blinks (from 2 to 6) representing the
    first digit, followed by a pause, and another series
    of blinks (from 1 to 6) for the second digit (see
    Figure 5B-40).
    a. It’s a good idea to write down the codes as
    they appear, as they may not be in numerical
    sequence.
    b. Code 61 will always be the last code
    displayed, indicating the end of code
    transmission. If code 61 appears immediately,
    no other fault codes are present.

    Post any fault codes you are getting and I'll tell you what it is or you can download the 28 EFI manual from www.kohlerengines.com
     
  4. Blackhatch

    Blackhatch LawnSite Member
    Posts: 79

    Great response Richard.

    I didn't know that you could do that on these. We used to have to jumper the old ECM to get them to code flash.
     
  5. taylo708

    taylo708 LawnSite Member
    from MI
    Posts: 51

    Thanks you so much everyone, the key thing is great I never knew you could do that. So I did it and it threw code 34 which is maximum or minimum adaption limit reached. When I looked it up it said it could be caused by fuel so I went and got some fuel conditioner for it and mowed two lawns. After this I went and put 7 gallons of 93 octane in it. Sad to say it was still doing it when I got done tonight : ( I checked the codes again today and it gave me 34 and 31. So I unplugged the battery and 31 hasnt come back yet. Im sure it could be multiple things and no certain way to tell what is causing this but any ideas? Im not really sure how strong this mower is suppose to feel since it has been like this since the first time i have mowed with it but I think she is not up to par.
     
  6. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    Just because the 31 disappeared after you disconnected the battery doesn't mean it's not the cause. When you disconnected the battery you dumped the KAM or Keep Alive Memory. The fault would still be there it's just not showing up yet.

    I would replace the O² sensor first and go from there.
     
  7. taylo708

    taylo708 LawnSite Member
    from MI
    Posts: 51

    Thanks a lot richard you have been very helpful. I will try that the next rain day I have, hopefully it works. Do you know much about that code could that be affecting my engines performance, or just messing with the computer?
     
  8. Richard Martin

    Richard Martin LawnSite Fanatic
    Posts: 14,700

    If the computer stops looking at the sensors (which is the case here) then it resorts to using preprogrammed stratagies to run the engine. This is certainly not optimal under any circumstance.

    The beauty of electronic fuel injection is it can adapt to varrying conditions. Heat, cold, air pressure increases and decreases and wear of the engine and hardware. These are some of the things the computer can adjust for. It obviously does this by getting feedback from the various sensors on the engine. If you remove input from those sensors the computer is basically flying blind and can't adjust for anything.
     
  9. Blackhatch

    Blackhatch LawnSite Member
    Posts: 79

    Closed Loop vs. Open Loop
    Finally, there are two forms of internal control for fuel injection systems. The most common method uses a special component called a Lambda (or O2) sensor, which permits the system to compare the amount of oxygen in the exhaust with the amount in the outside air, and then signal the computer telling it to adjust the fuel mixture. This is called "Closed Loop," and most fuel injection systems are this type. There are however still many motorcycles and other recreational vehicles that are of the Open Loop design, which is simply a system which does not have an O2 sensor.

    http://en.wikipedia.org/wiki/Fuel_injection
     
  10. Blackhatch

    Blackhatch LawnSite Member
    Posts: 79

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