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  1. #1
    Join Date
    Mar 2014
    Alexandria, VA

    Default Please help refine my plan to DIAGNOSE my XC70 AWD problems

    I plan to diagnose my AOC soon. Here is my plan since I already know that my angle gear and trans coupler are good:

    1. Check AOC DEM fuse (#16 I think)
    2. check resistance of the AOC oil pump by using multi-meter on the pumps leads
      (I think I'm looking for something between infinity and zero).
    3. check oil level in AOC
      Click image for larger version. 

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    4. check operation of pump by applying 12v to the leads to see if the motor spins
    5. check pump filter (remove pump and inspect the screen)

    Does anyone know if there is a way to check/diagnose the pressure switch?

    Finally, if it turns out that I have a bad pump, and I replace it, do I need to “reprogram” the DEM?

    Thanks all!

  2. #2
    Join Date
    Apr 2003
    Devon PA


    Yes, have it read in VIDA.
    If it or the DEM is bad you will have a stored code(s) and the codes are different for a bad DEM module and/or just a bad pressure switch.
    Hell of a lot quicker and easier than your plan!
    All emails please use: jrl1194 (at)

    2007 V70 2.5T White/Oak, 112K miles. My daily driver and GORGEOUS
    2000 V70R wife's. Won't sell, now at 148K miles !! and still (almost) perfect.
    2000 S70 GLT SE with 29,000 miles!!! A time capsule, V70R front bumper, Volans, etc. SOLD!!! (I Will regret selling this!)

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