bench test

Lincoln LS

  1. 92spi

    92spi Active LVC Member

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    anyone know of a definitive bench test of a 1st gen DCCV? anything including voltage and amperes would help. thanx.:)
     
  2. oddball

    oddball Dedicated LVC Member

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    There are a few failure modes: physical break, corrosion/clogging, and electrical short.
    For a physical break, just inspect closely for cracks. I don't think the DCCV has the micro-crack problem, so you're looking for more obvious issues, like a hole.
    For corrosion, you can just momentarily connect the outer pins to v+ while the center pin is grounded. The solenoids should fire, with the plunger smoothly extending and retracting. Close inspection inside the water passages will also tell you plenty. The heads of the plungers should be clean, and the area they contact should be smooth.
    For electrical, the specifications are in the service manual. It's a basic resistance test to ensure the coil windings and connections haven't broken.

    In my case, the difficult to track problem was a driver in the DATC was partially failed and didn't sink enough current to fully actuate one of the solenoids. This took a little more investigation, but there are procedures in the service manual.
     
  3. joegr

    joegr Dedicated LVC Member LVC Gold Member

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    You have a test bench that can flow water or coolant through the valve while you are testing it?
    0V is fully open, 12V is fully closed. It is PWM'd for the in between. Also need to verify that there is greater than 10 Mega-ohm resistance between any terminal and the metal cases over the solenoids.

    Seems like it would be easier to test it on the car...
     
  4. 92spi

    92spi Active LVC Member

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    thanx for the info, guys. local pick and pull got a "new" '00 ls v6 auto w/46k miles. pretty well crunched on drivers side, but lotsa good looking parts including a dccv, hyd. fan, etc. just lookin' to the future.....
     

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