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no check engine light and fan issues

Discussion in 'Freightliner Forum' started by truckerbangin, Jul 15, 2015.

  1. Jul 15, 2015 #1
    truckerbangin

    truckerbangin Light Load Member

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    Jan 22, 2013
    0
    good day all i have a 200 fld120 daycab with ddec iv 12.7 i have no check engine light only engine shutdown light. all ready changed kysor edm and light panel on dash board with no good news. also my engine fan stay on 24/7 when i key truck on it frees fan up for about 15-30 secs then lock fan right back up. i have a new fan solenoid installed with new ac high pressure switch and known working kysor edm's. any idea as to what my problem can be?
     
    truckerbangin, Jul 15, 2015
    truckerbangin, Jul 15, 2015
    #1
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  3. Jul 15, 2015 #2
    AModelCat

    AModelCat Road Train Member

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    Jul 7, 2015
    Canuckistan
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    I would start by checking engine temp. sensor. Sometimes you have 2 different sensors, one for your gauge and 1 the ecm reads. Could be the one the ecm reads is reading wrong and telling the ecm you are overheating, which would trigger your fan to engage.
     
    AModelCat, Jul 15, 2015
    AModelCat, Jul 15, 2015
    #2
    truckerbangin Thanks this.
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