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Walker Service Engine Light

Discussion in 'Lawn Mowing' started by ATouchofGrass, May 16, 2008.

  1. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 499

    Well yesterday at the end of the work day i shut it off to go and trim. I came back and went to go and start the machine and noticed that the Service Engine Light had come on. And while mowing i felt the motor bog down on lawns that it has never had a problem with. :confused: Now i self tested it and the light came on 4 times and then paused and came on 2 more times. Could anyone offer me any insight?
     
  2. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 499

    Anyone????
     
  3. ALC-GregH

    ALC-GregH LawnSite Fanatic
    from PA
    Messages: 7,051

    probably a code 42. I have no clue what it represents. Maybe a O2 sensor or a TPS is going bad. What engine does it have? I assume it's EFI?
     
  4. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 499

    Correct it has a 26 HP EFI, what is the TPS?
     
  5. ALC-GregH

    ALC-GregH LawnSite Fanatic
    from PA
    Messages: 7,051

    Throttle Positioning Sensor.
    I meant to ask if it was liquid cooled. If so, a CTS could be bad and trip a code. For the sake of asking, Coolant Temperature Sensor.... but without the proper (this is where they get you) diagnostic tools, your only hope is to find a honest dealer, or if you feel you already have that with a specific dealer, then take it in and ask if they can give you the definition of the code 42. Maybe a repair manual has a list of trouble code definitions that will lead you to the problem. I'm thinking O2 sensor as they can cause a lean condition if not working properly. Best stop by the dealer though as again, I haven't a clue other then automotive service code diagnostics but they might be the same or similar.
     
  6. topsites

    topsites LawnSite Fanatic
    Messages: 21,653

  7. ATouchofGrass

    ATouchofGrass LawnSite Senior Member
    Male, from CT
    Messages: 499

    Sorry, i didnt see the mechanic and repair forum.
     
  8. XterraJohn

    XterraJohn LawnSite Member
    Messages: 178

    I googled and found a Kohler service manual online:

    http://www.kohlerengines.com/common/resources/tp_2450_b.pdf

    On page 99, it lists two possible causes for a blink code of 42:

    Temperature Sensor Circuit: Shorted to Ground
    Temperature Sensor Circuit: Open Circuit or Short to Battery


    Either way, it sounds like it's most likely a wiring problem concerning the temperature sensor. Look for any loose/disconnected wires, or any wires that have the insulation rubbed off of them allowing them to short.
     

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