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    Thread: Jetta 2.0/Auto - Speed sensor/reverse sensor & misfire questions/clarification

    1. Member el_bobbo's Avatar
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      MK5 GTI, MK6 R, MK2 Jetta Coupe VR
      09-02-2013 02:49 PM #1
      Been digging around for a couple weeks now, sorting stuff out on the MK3 I gave my mother-in-law over a year ago. Seems now that the speedo works intermittently, it's misfiring, and the reverse lights stopped working.

      Speedo:

      Seemed to have tracked this down to being the Vehicle Speed Sensor (vs the cluster) because everything else works. It's an automatic, so I did some digging on here for picture and I'm confused...

      Everyone else seems to have a 3-wire VSS (black connector), but I seem to have a 2 wire? Assume also that the reverse switch is the one in front of it (white connector)?



      If that is the case, what the heck is this guy hidden under the battery?







      With regards to the misfire, this is all that I am getting from VCDS:

      5 Faults Found:
      16885 - Vehicle Speed Sensor
      P0501 - 35-00 - Implausible Signal
      16684 - Random/Multiple Cylinder Misfire Detected
      P0300 - 35-00 -
      16687 - Cylinder 3
      P0303 - 35-00 - Misfire Detected
      16684 - Random/Multiple Cylinder Misfire Detected
      P0300 - 35-10 - - Intermittent
      16687 - Cylinder 3
      P0303 - 35-10 - Misfire Detected - Intermittent

      Should I start with replacing the cap, since it's logging random/multiple misfires
      My MKV APR Stg II+ build thread: The build...the blog...the boosted...
      MK4 Jetta gone, MK2 VR6 in the works :-)

    2. Member LG6R's Avatar
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      purple girl's car
      09-02-2013 03:09 PM #2
      Sounds like you have a couple of different problems. The misfire is independant of the transmission. I would check basic things like cap, rotor, wires, and plugs.

      Regarding the tranny questions,

      Quote Originally Posted by el_bobbo View Post
      Speedo:

      Seemed to have tracked this down to being the Vehicle Speed Sensor (vs the cluster) because everything else works.
      Doesn't mean anything. Usually the speedometer is the only thing to go whereas all the other gauges will continue to function on a bad cluster. I would still start with changing the cluster.


      Quote Originally Posted by el_bobbo View Post

      Everyone else seems to have a 3-wire VSS (black connector), but I seem to have a 2 wire? Assume also that the reverse switch is the one in front of it (white connector)?
      The VSS is not the black 2-wire connector in your first picture. Not sure what that connector is for. You're right in that the white plug is for the reverse lights. If you checked the bulbs, I would look for a break in the wiring.

      The VSS that sends the mph readings to your cluster would be more towards the rear of the bellhousing, far back near the firewall. It screws onto the top of the speedometer gear. Looks like the first one in this link:
      http://www.germanautoparts.com/Volks...smission/194/1


      Quote Originally Posted by el_bobbo View Post
      If that is the case, what the heck is this guy hidden under the battery?
      That's the speed sensor that tells your transmission how to operate, when to shift gears, etc. It's for the proper operation of the transmission, whereas the other one just tells the instrument cluster what speed to display. Looks like the second one in this link:
      http://www.germanautoparts.com/Volks...smission/194/1

    3. Member el_bobbo's Avatar
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      MK5 GTI, MK6 R, MK2 Jetta Coupe VR
      09-02-2013 03:23 PM #3
      Awesome, thanks!
      My MKV APR Stg II+ build thread: The build...the blog...the boosted...
      MK4 Jetta gone, MK2 VR6 in the works :-)

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