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Engine fan not coming on

Discussion in 'Trucks [ Eighteen Wheelers ]' started by US MARINE, Oct 6, 2012.

Page 2 of 3
  1. Oct 6, 2012 #11
    US MARINE

    US MARINE Heavy Load Member

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    I think your right
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #11
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  3. Oct 6, 2012 #12
    US MARINE

    US MARINE Heavy Load Member

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    I found in the book that the exact code on my dash is for the CDTC Sensor

    Action Go to test no. 2.
    Check for sensor signal wire shorted to power. If okay, go to test no. 2.
    Check for sensor signal wire shorted to ground. If okay, replace FCU/ACU. Go to test no. 3.
    Perform "CDTC Temperature Sensor Test."
    Check for open circuit in sensor signal and ground wires. If okay, replace FCU/ACU. Go to test no. 3.


    Test
    Test Procedure
    Check if one of the following fault codes is active: 146 s001 03, 146 s001 04, or200 s001 03, 200 s001 04.
    Disconnect the CDTC sensor.
    Turn the ignition on and measure the voltage across the sensor connector pins (harness side).
    The voltage should be 5V if the circuit and FCU/ACU are operating correctly.
    Test Result
    None of these faults isactive.
    146s001 03 or 200 s001 03 is active.
    146s001 04 or 200 s001 04 is active.
    5V
    Less than 5V.
    1 Are CDTC temperature sensor fault codes active?
    2 Check sensor reference voltage.

    the 146s 001 03 is my active code but not sure as to why or how that would effect my outside engine fan unless its coupled along with the HP sensor on the AC also ..
     
    US MARINE, Oct 6, 2012
    US MARINE, Oct 6, 2012
    #12
  4. Oct 7, 2012 #13
    bender

    bender Road Train Member

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    Constant Discharge Temperature Control sensor. It monitors your duct temperature to keep it constant. No idea where it is located.
     
    bender, Oct 7, 2012
    bender, Oct 7, 2012
    #13
    US MARINE Thanks this.
  5. Oct 7, 2012 #14
    US MARINE

    US MARINE Heavy Load Member

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    I think it's under the dash
     
    US MARINE, Oct 7, 2012
    US MARINE, Oct 7, 2012
    #14
  7. Oct 7, 2012 #15
    bender

    bender Road Train Member

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    Don't Kid Yourself
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    Last edited: Oct 7, 2012
    bender, Oct 7, 2012
    bender, Oct 7, 2012
    #15
  8. Oct 7, 2012 #16
    Sgtmike

    Sgtmike Bobtail Member

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    Sep 2, 2012
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    No the HVAC is not connected to the EGR system. These are two seperate systems that are not related. A Mid of 146 is the HVAC controller and shorted High is a cut or broke wire in the fan circuit. If you un-plug the high pres. switch the engine fan should run all the time. If you un-plug the fan sol. switch the fan should run all the time. I would first check the wire harness at the engine controller (ECM) and check for broke wires there. Let me know what you find.
     
    Sgtmike, Oct 7, 2012
    Sgtmike, Oct 7, 2012
    #16
    US MARINE Thanks this.
  9. Oct 7, 2012 #17
    claytonr1973

    claytonr1973 Light Load Member

    266
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    Jun 1, 2008
    miami,ok
    0
    There should be a relay for the fan. Did you check that? Some fan hubs require air to engage(usually hortons),others require air to disengage(Kaiser). I went through the exacy opposite. My fan stayed on and after I replaced all the switches and the solenoid I found it was a stinking breaker(FLD).
     
    claytonr1973, Oct 7, 2012
    claytonr1973, Oct 7, 2012
    #17
  10. Oct 7, 2012 #18
    US MARINE

    US MARINE Heavy Load Member

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    There are 2 HVAC fuses and 1 breaker the fuses look good . The breaker I'm not sure cause I don't know much about them .

    tge Fan has a fuse but its a metal fuse where you can't see inside of it so I don't know if its good or not to tell the truth . In not much of a electrician .

    Would the CdTC sensor have anything to do with the fan on the engine ?
     
    US MARINE, Oct 7, 2012
    US MARINE, Oct 7, 2012
    #18
  11. Oct 11, 2012 #19
    US MARINE

    US MARINE Heavy Load Member

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    Sep 15, 2011
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    Broken wire on ECM is what it was
     
    US MARINE, Oct 11, 2012
    US MARINE, Oct 11, 2012
    #19
  12. Oct 17, 2012 #20
    fastsix62

    fastsix62 Light Load Member

    75
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    Feb 4, 2011
    fort worth, tx
    0
    Just replace the clutch on the fan which will take about 5 minutes removng the 6 small screws and only replace the clutch which you can do by cutting it in half without removing the fan blade assy. The kit cost me about 110.00 at Freightliner about one month ago.
     
    fastsix62, Oct 17, 2012
    fastsix62, Oct 17, 2012
    #20
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