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  1. #1
    Join Date
    Aug 2013
    Posts
    4

    Default P0502 sensor location

    I had for quite a while problems with skid error and abs which "agravated" a check engine light (P0502) and message to go service abs/skid system.
    I reflowed the ABS unit without success, infact I notticed the module was a better build and the type of connector was "knife"on PCB side so I kind of regereted oppening it up.

    Recently I noticed the engine is winding up without changing the gear, so I thought that the signal from the sensor is indeed low and I am looking to change it.

    Does anyone have a picture with the speed sensor location (in transmision not wheel speed sensors)?
    Thanks.
    Last edited by galatasarai; 09-07-2013 at 08:38 PM.

  2. #2
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    Need more information about the car, as well as posting in proper English instead of pig Latin.

    Dave.
    Our Most Probable Fate Is Death !!!

  3. #3
    Join Date
    Aug 2013
    Posts
    4

    Default

    Quote Originally Posted by Aviator View Post
    Need more information about the car, as well as posting in proper English instead of pig Latin.

    Dave.
    2002 V70XC AWD, and thanks for the warm welcoming.

  4. #4
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    From your information it sounds like you need a new BCM (brake control module), plus software. I highly doubt there is an issue with a speed sensor in the transmission.

    Dave.
    Our Most Probable Fate Is Death !!!

  5. #5
    Join Date
    Aug 2013
    Posts
    4

    Default

    Quote Originally Posted by Aviator View Post
    From your information it sounds like you need a new BCM (brake control module), plus software. I highly doubt there is an issue with a speed sensor in the transmission.

    Dave.
    It may sound like marketing for a new BCM but I trust my investigation.
    It is easyer to replace one sensor borrowed from a neighbor. cheaper also. As I said, I tested BCM, time to move on.

    So, back to square one, my simple question was:
    - does anyone knows the location of Vehicle Speed Sensor (VSS), prefferably with a picture or drawing?

    Thank you.

  6. #6
    Join Date
    Dec 2009
    Location
    GA
    Posts
    1,420

    Default

    Here a picture from the parts catalog, #15 is decribed as a vss. Might take the #16 kit depending on your serial number
    Click image for larger version. 

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    Last edited by hoonk; 09-09-2013 at 01:45 PM.

  7. #7
    Join Date
    Jan 2007
    Location
    Nova Scotia, Canada
    Posts
    1,446

    Default

    What did you test the BCM with?
    Our Most Probable Fate Is Death !!!

  8. #8
    Join Date
    Aug 2013
    Posts
    4

    Default

    Quote Originally Posted by hoonk View Post
    Here a picture from the parts catalog, #15 is decribed as a vss. Might take the #16 kit depending on your serial number
    Click image for larger version. 

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ID:	5412
    Thanks, that's good news and I believe #15 (sensor B) is actually for the speedometer (in dashboard) and #15a is the one I suspect failed me, the sensor A (if I recall correctly at this hour the meaning of P0502).
    I wonder if they are interchangeable for a quick test, and if the cables are long enough to permit swapping. However, having two on the same location, it would be easy to put a scope on both and to compare the amplitude.

    Thanks again.

  9. #9
    Join Date
    Aug 2016
    Location
    New Hamshire
    Posts
    1

    Default

    Hi I have the same problem with my 02 V70xc and need to replace the VSS sensor. It looks like on the diagram it is on the back side of the transmission but I can not locate it. Any help would be appreciated.

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