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Faulty coolant temp sensor

Discussion in 'Volvo Forum' started by jlaw, Apr 13, 2013.

  1. Apr 13, 2013 #1
    jlaw

    jlaw Bobtail Member

    2
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    Apr 13, 2013
    0
    Hello, I'm new to this forum,

    I have a 1997 Volvo Highway tractor semi with a VE D12 425 motor. Engine shuts down when engine temp reaches 180F although the truck is not actually overheating. Check engine light comes on first. Diagnostic code indicates faulty coolant temp sensor. I have replaced the sensor and still same results.... Any help would be appreciated thanks,
     
    jlaw, Apr 13, 2013
    jlaw, Apr 13, 2013
    #1
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  3. Apr 13, 2013 #2
    eeb

    eeb Heavy Load Member

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    Mar 24, 2013
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    Check the wires and terminals going to the sensor for damage or corrosion.
     
    eeb, Apr 13, 2013
    eeb, Apr 13, 2013
    #2
  4. Apr 13, 2013 #3
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    what engine? D12C ore D12A/B? Is it early FH oew WG?
     
    Pablo-UA, Apr 13, 2013
    Pablo-UA, Apr 13, 2013
    #3
  5. Apr 13, 2013 #4
    jlaw

    jlaw Bobtail Member

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    Apr 13, 2013
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    Thanks I will check that out.
     
    jlaw, Apr 13, 2013
    jlaw, Apr 13, 2013
    #4
  7. Apr 13, 2013 #5
    Wariour1

    Wariour1 Bobtail Member

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    Mar 26, 2013
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    Diagnostic code should say either coolant input sensor low or high. High indicates that sensor might be bad.
     
    Wariour1, Apr 13, 2013
    Wariour1, Apr 13, 2013
    #5
  8. Apr 13, 2013 #6
    Pablo-UA

    Pablo-UA Road Train Member

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    Oct 11, 2010
    Borispol, Ukraine
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    really early Volvo ECU got no engine protection and there was engine protection unit with relay that disabled engine when you pull over. It is like relay unit on early WG and Volvo F12 with 123 engine. it is black box with wires and relay
     
    Pablo-UA, Apr 13, 2013
    Pablo-UA, Apr 13, 2013
    #6
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