2007 Freightliner Columbia 120 w 14L Detroit n 10 spd man, check engine light blinks after long idle

Discussion in 'Freightliner Forum' started by pfflyer, Nov 28, 2021.

  1. pfflyer

    pfflyer Bobtail Member

    3
    1
    Apr 29, 2014
    0
    Looking to purchase the beast described above. I gave a 500 deposit to hold for four weeks.
    I went a couple days before my hold expired to check it out real good.
    It started right up after sitting those four weeks, but while giving it a thorough looking over and it idling for about 20 minutes the check engine light started blinking. It seemed odd to me that it would go away if I pressed on the gas pedal only to returned after a couple minutes at idle.
    Does anyone know what the issue might be?
    It does have 1.2 mill on it and was informed it has only been given injectors recently.
    No rebuild ........
    Everything else on the truck seems to work and runs fine with good oil pressure. I didn't take it out on the road as sales was closed, but noticed the key in it. Engine looked dry with no visible leaks.
    Brand new virgin rubber for 11k, its a single axle
    Thank You In Advance For Your Time)
     
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  3. Ross_Tech

    Ross_Tech Light Load Member

    132
    129
    Aug 31, 2021
    Michigan
    0
    Copied and pasted from the DDEC IV A&I manual:
    "3.16.1 Check Engine Light
    The CEL is controlled by the DDEC ECM. The CEL remains ON:

    For approximately five (5) seconds at the start of every ignition cycle (a bulb check)

    When an electronic system fault occurs (This indicates the problem should be diagnosed as soon as possible.)
    The CEL flashes:

    When the Diagnostic Request Switch is used to activate the CEL to flash inactive codes

    During last 90 seconds before Idle Shutdown if programmed for override"


    Depending on how the parameters are programmed in your ecm, it is normal. I would definitely have a mechanic plug into it to verify before buying though.
     
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