Assistance on "check Engine" codes P0725 & P0700

Discussion in 'General Motoring' started by Ralph Shapiro, Aug 21, 2006.

  1. I had some problems on my 98 Ply. Breeze, 63K Miles, 2.0L 4 cyl, auto, this
    weekend.
    This is the second time this has happened.
    Decel coming off the freeway, feels like a misfire, or problem W/trans
    hanging in higher gear, then downshifting. Check engine light comes on and
    car goes into limp mode.
    Turn off the car for a while, check engine still on, but now running fine.
    Went to Auto Zone and borrowed their code reader (thanks Auto Zone!) and got
    1 P0725 - engine speed sensor and 2 P0700 ( forget the exact description)
    something like transmission controller.
    I'd like to fix myself but need some assistance.
    Is there actually an "engine speed sensor" that can be replaced? Where might
    it be?
    Anybody else experience this problem? What did you do to fix?
    Any and all topic related posts greatly appreciated!
     
    Ralph Shapiro, Aug 21, 2006
    #1
  2. Ralph Shapiro

    Bill Putney Guest

    You likely have a bad transmission input speed sensor - that would be
    consistent with the codes and symptoms. A $15-30 part depending on
    where you get it, and you can replace it yourself (put car up on
    jackstands, crawl under car - screw old sensor out, new sensor in using
    a 1" wrench - open end or socket - either may work, one may give better
    accessibility than the other).

    Bill Putney
    (To reply by e-mail, replace the last letter of the alphabet in my
    address with the letter 'x')
     
    Bill Putney, Aug 22, 2006
    #2
  3. Thanks, Bill. I'll give it a shot.
     
    Ralph Shapiro, Aug 22, 2006
    #3
  4. Ralph Shapiro

    maxpower Guest

    More then likely as Bill said the input speed sensor. If you are going to
    replace the input sensor you may as well get the output sensor also. They
    are right next to each other and easy to get at.

    Glenn Beasley
    Chrysler Tech
     
    maxpower, Aug 22, 2006
    #4
  5. Thanks, guys. Haven't spent any $$$ for the whole ownership of the car.
    Guess its time to throw some to the auto gods.
     
    Ralph Shapiro, Aug 23, 2006
    #5
  6. Well, I've replaced both input and output trans. sensors, to no avail.
    Problem still exists.
    After searching the internet, I've also cleaned all grounds under the hood.
    I checked the connector to the cam sensor ( at back of head), and found it
    full of oil from a blown head gasket, so I cleaned that out.
    Pulled the connector at the trans, it had trans fluid in it, cleaned that.
    Took to a shop ( non dealer) for a diagnostic, they said may be crank
    position sensor or TCM, but could not say for sure which was bad, or even if
    this would fix.
    Additional research said P0700 indicates that the TCM has to be queried for
    more specific codes. Is this true, can the TCM have codes that can be read?
    So, my additional question, could the TCM be bad? Any service bulletins on
    TCM problems? Reflash the TCM ? Can codes be read from it that will indicate
    more info on the problem?
    Should I have an 'accident' to get rid of this car?

    I also had the trans fluid changed in 3/05 at a non dealer. No description
    of ATF+4 being used on the flush, but additive used. Did I shoot myself in
    the foot on this? Getting the fluid changed again today.
     
    Ralph Shapiro, Sep 11, 2006
    #6
  7. Ralph Shapiro

    Bill Putney Guest

    If they used an additive, there's a 99.9999% chance that they did not
    use ATF+4. Most likely Dexron plus an additive. Can't say for sure if
    it's your problem, but it's not good.

    Bill Putney
    (To reply by e-mail, replace the last letter of the alphabet in my
    address with the letter 'x')
     
    Bill Putney, Sep 11, 2006
    #7
  8. Ralph Shapiro

    philthy Guest

    did you disconnect the battery to erase the codes???
    the computer will still be in limpin mode if you did not
     
    philthy, Sep 11, 2006
    #8
  9. Don't try to diagnose a modern computer controlled car yourself. You
    may get lucky and find the problem, once in a while, but very rarely.
    The machine used to diagnose these new cars quickly and effectively
    costs $40,000 I have a close friend I went to high school with, that
    has one and is in the repair business. If you saw that machine work
    and knew how complicated the engines controls really are, you would not
    even bother trying to fix that car. Your problems with the car can be
    a multitude of things.

    The basic diagnosis procedure should always include fuel
    pressure/volume, exhaust backpressure, and scan all the sensors. Then
    the ignition and plugs and timing. Then the computer and proms are
    checked. If the problem still is not found, then it may be an
    electrical connection in the harnesses somewhere. Very rarely is it an
    engine mechanical problem.
     
    duty-honor-country, Sep 12, 2006
    #9
  10. Your story sounded legit until you got to the part about having a close
    friend, that's when people realized it was total bullshit.
     
    bicycle, The Fifth Wheel King, Sep 12, 2006
    #10
  11. Ralph Shapiro

    DeserTBoB Guest

    If you're an idiot like Charlie Nudo, you cannot diagnose ECM
    controlled cars. If you have half a brain and can read a manual, you
    can.
     
    DeserTBoB, Sep 12, 2006
    #11
  12. Ralph Shapiro

    maxpower Guest

    Just curious......are you guys married????

    Glenn
     
    maxpower, Sep 12, 2006
    #12
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