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DTC 25 - Left Front Excessive Wheel Speed Variation: Notes

NOTE: For circuit and connector terminal identification, see WIRING DIAGRAM  .

As a toothed ring passes the wheel speed sensor, changes in electromagnetic field causes sensor to produce an AC voltage signal. Frequency of signal is proportional to wheel speed. Magnitude of signal is directly related to wheel speed and the proximity of the wheel speed sensor to the toothed ring. This distance is also referred to as "air gap"

NOTE: Test numbers refer to test numbers on diagnostic chart.
  1. Identifies visibly damaged wheel speed sensor or circuit.
  2. Checks wheel speed sensor for proper resistance.
  3. Ensures wheel speed sensor and sensor ring generate proper voltage.
  4. Ensures wheel speed sensor circuit is not shorted together.
  5. Ensures malfunction was not due to a poor connection.
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