2002 XG350 Vehicle speed sensor - how to test / replace?

Discussion in 'Hyundai Grandeur / Azera / XG' started by Dan K, Jul 11, 2007.

  1. Dan K

    Dan K Guest

    I've been all through the Hyundai web site and can't find much of anything
    other than a location picture. Maybe its so simple to replace it doesn't
    need documentation? (yea, right - dream on). Can someone help me out?
    Speedometer is now not working and check engine light is on. Car seems to
    drive ok, but no cruise control.


    Dan K, Jul 11, 2007
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  2. Dan K

    hyundaitech Guest

    Hyundai's diagnostic routines are very poor and are often not even present.
    You'll want to base your diagnostics off the schematic for the vehicle
    speed sensor (in body electrical section).

    At the vehicle speed sensor connector, you should have power in the pink
    wire (key on) and ground in the black/white wire. When the wheels are
    turning (speed sensor plugged in), you should have a square wave in the
    brown wire. The frequency of the wave should vary with wheel speed.

    To remove the sensor and gear assembly, remove the 10mm bolt attaching it
    to the transmission. Then, twist back and forth while lifting out of the

    I've had cases where the speed sensor broke during removal attempts. This
    is yet another reason why, if you've determined you have no signal from the
    sensor, I recommend just replacing the sensor and gear. This cures over
    90% of speedometer inop issues.

    Once you remove the sensor, you'll have the sensor and gear out of the
    transmission. Check the plastic gear. If the teeth are damaged--
    usually, the center portion of the teeth is worn-- you'll need a new gear.
    To remove the gear from the sensor, simply remove the clip holding the
    gear onto the sensor.
    hyundaitech, Jul 11, 2007
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