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Low coolant Light /chk engKeeps Coming on???

Discussion in 'Trucks [ Eighteen Wheelers ]' started by firecatf7333, Jun 28, 2016.

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  1. Jul 6, 2016 #11
    firecatf7333

    firecatf7333 Light Load Member

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    Took to Freightliner and they still can't figure out the problem. Said it could be a bad ecm but they can't guarantee anything. They plug into there laptop and read codes. They go from there and they cant see the light doing it so they say they don't know where to start
     
    firecatf7333, Jul 6, 2016
    firecatf7333, Jul 6, 2016
    #11
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  3. Jul 6, 2016 #12
    BigPerm

    BigPerm Medium Load Member

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    Fron Calif, NM, NV, & now TX.
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    Freightliner NEEDS to put "real" technician on your truck. Not the parts changer with a laptop.
    You buy an ECM... you own it. I bet 80% of the ECM's I've sold were not bad.
     
    BigPerm, Jul 6, 2016
    BigPerm, Jul 6, 2016
    #12
  4. Jul 6, 2016 #13
    AModelCat

    AModelCat Road Train Member

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    I would be very cautious of a tech who straight away blames an ECM. Majority of the time its the wiring or the sensors that fail. If the ECM doesn't receive a proper signal from sensors, it can't re-act 100% correctly.
     
    AModelCat, Jul 6, 2016
    AModelCat, Jul 6, 2016
    #13
    j_martell Thanks this.
  5. Jul 8, 2016 #14
    firecatf7333

    firecatf7333 Light Load Member

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    Oct 28, 2012
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    There saying since the light doesn't stay on and they cant see it happen they cant be 100% sure what the problem is.. They put a test ecm on it and in 100 miles the sensor light has not come on... Wouldn't this confirm its a bad ecm? Can old one be rebuilt
     
    firecatf7333, Jul 8, 2016
    firecatf7333, Jul 8, 2016
    #14
  7. Jul 8, 2016 #15
    firecatf7333

    firecatf7333 Light Load Member

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    Oct 28, 2012
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    Edit: sensor just came on
     
    firecatf7333, Jul 8, 2016
    firecatf7333, Jul 8, 2016
    #15
  8. Jul 9, 2016 #16
    BigPerm

    BigPerm Medium Load Member

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    Sep 4, 2012
    Fron Calif, NM, NV, & now TX.
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    See...could've been a $2K test drive.
     
    BigPerm, Jul 9, 2016
    BigPerm, Jul 9, 2016
    #16
  9. Aug 25, 2016 #17
    firecatf7333

    firecatf7333 Light Load Member

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    Oct 28, 2012
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    Update: Brought back to Tracey Road equipemnt (freightliner of Rochester NY) 2 more times and a few grand later where they finally "fixed" some electrical problem.

    3 weeks later all is good until we get a truck wash... I'm thinking pressure from hoses messed up the same issue bc the coolant light came on right after wash and then went away for 1000 miles.....now the low volts light is on....
    Gauge was at 12 volts but now after a day of driving is slowing creeping towards 11

    The guage could be wrong and messed up bc of the bad ground somewhere. I want the dealer to fix the same spot they fixed last time but of course they don't know who or what was exactly fixed last time......now they'll start over and rack up another nice bill

    This electrical issue has been a nightmare
     
    firecatf7333, Aug 25, 2016
    firecatf7333, Aug 25, 2016
    #17
  10. Aug 25, 2016 #19
    X mech

    X mech Light Load Member

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    Nov 14, 2015
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    Coolant light could be level or temperature two different sensors. Testing from the ECM is a imperative. Your alternator should be putting almost 13 volts out. Batteries are you usually only good for three to four years. They do make a ECM pin testing pin. I would pull the connectors off each of the sensors and physically look at the connection. I have taken connections apart and found that the factory crimped the insulation rather than the copper. Sounds like you would be better off buying the electrical book for your truck then taking it to a dealer. The book only cost 152 $200. You need to find all of the grounds.
     
    X mech, Aug 25, 2016
    X mech, Aug 25, 2016
    #19
  11. Aug 25, 2016 #19
    X mech

    X mech Light Load Member

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    Nov 14, 2015
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    You need to talk to Detroit Diesel and have them program your computer so it doesn't shut off the engine. You must be getting some sort of diagnostic code or a flash code for the problem I have the books for your truck give me the codes and I will tell you what they are or what they mean
     
    X mech, Aug 25, 2016
    X mech, Aug 25, 2016
    #19
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