pre-start sequence, what is it doing??

Discussion in 'Trucks [ Eighteen Wheelers ]' started by randomname, Jun 9, 2015.

  1. randomname

    randomname Light Load Member

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    Just curious here. When I get in my T660 and insert key and turn to the right, and before i engage the starter, what is the truck doing during its "preamble", for lack of a better word? I hear some funky servo sounds and the brakes purge themselves or something. I usually wait for it to complete before cranking. On my personal diesel car I always wait for the glow plug light to go out, but it only takes a second or 2.
    Thanks!
     
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  3. Snailexpress

    Snailexpress Road Train Member

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    1. Turbo actuator calibration test run
    2. EGR calibration test run
    3. ABS test run
    4. LCM test run
    5.BBM test run
    6.ECM test run
     
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  4. bigdogpile

    bigdogpile Road Train Member

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    Its making sure there's no short from the seat to the key
     
  5. randomname

    randomname Light Load Member

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    Thanks snail. Is it doing any harm if I crank it before it finishes everything?
     
  6. driverdriver

    driverdriver Road Train Member

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    Yes it will start causing problems. I created a situation with mine where the lights wouldn't shut off.
    Not allowing it to run thru the process is the same as your laptop booting up with out all the files loading.
    It might not happen right away but, eventually you'll start having issues
     
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