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Front Speed Sensors

  1. Disconnect speed sensor harness connector. Measure resistance between speed sensor terminals No 1 and 3, and terminals No. 2 and 4. See Figure. Resistance should be 870-1270 ohms. If resistance is not as specified, replace sensor.
  2. Check continuity between each sensor terminal and sensor body. Continuity should not exist. If continuity is not as specified, replace speed sensor.
  3. Inspect sensor rotor teeth for scratches, cracks, warping, or missing teeth. Connect oscilloscope to speed sensor connector. Drive vehicle at 12.4 MPH and observe speed sensor output wave. Verify "C" is at least 0.5 volt. Verify "B" is at least 50 percent of "A". If pattern is not as specified, replace sensor rotor. See Figure.
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