Question about 1998 Mercury Mystique

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I replaced the valve body on CD4E transmission and my speedometer is reading at the top speed and will not recycle to 0 mph. How do I get it to reset to O mph

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  • dgardner459 May 06, 2010

    I'm having difficulty finding the speed sensor

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  • Mercury Master
  • 17,970 Answers

Its possible that you just need work's adjust-calibration; check this Guide and wiring.

Also, its possible that you need to check the Vehicle Speed Sensor (is located at end of speedometer cable).

Hope help.

Posted on May 05, 2010

  • ZJ Limited
    ZJ Limited May 05, 2010

    Keep in mind this last comment about the Vehicle Speed Sensor and I suggest read this items:

    OPERATION
    (see Figure 1)










    Fig. 1: VSS with connector and driven gear


    The Vehicle Speed Sensor (VSS) is a magnetic pick-up sensor
    that sends a signal to the Powertrain Control Module (PCM) and the
    speedometer. The sensor measures the rotation of the output shaft on the
    transaxle and sends an AC voltage signal to the PCM which determines
    the corresponding vehicle speed.




    TESTING




    1. Disconnect the negative battery cable.


    2. Disengage the wiring harness connector from the VSS.


    3. Using a Digital Volt-Ohmmeter (DVOM), measure the resistance
      (ohmmeter function) between the sensor terminals. If the resistance is
      190-250 ohms, the sensor is okay.


    REMOVAL & INSTALLATION



    1. Disconnect the negative battery cable.


    2. On a manual transaxle equipped vehicle:



      1. Remove the air cleaner assembly.





    3. On a automatic transaxle equipped vehicle:



      1. Raise and support the vehicle.





    4. Unplug the VSS electrical connector.


    5. Remove the speedometer cable (early models only).


    6. Remove the retaining bolt from the VSS.


    7. Lift the VSS out of the transaxle.


    8. Remove the driven gear retainer and the drive gear.


    To install:



    1. Inspect the O-ring on the sensor and replace if necessary.


    2. Install the driven gear and the retainer.


    3. Place the VSS into the transaxle.


    4. Tighten the retaining bolt to 43-53 inch lbs. (5-6 Nm).


    5. Install the speedo cable (if necessary).


    6. Attach the VSS electrical connector.


    7. On a manual transaxle equipped vehicle:



      1. Install the air cleaner assembly.






    8. On a automatic transaxle equipped vehicle:



      1. Lower the vehicle.







    9. Connect the negative battery cable.

    Good luck.

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