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Circuit/System Testing

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It is recommended that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.

  1. Ignition OFF, disconnect the harness connector at the EBCM.
  2. Ignition ON, test for less than 1 volt between the low reference circuit terminals of the appropriate sensor listed below and ground.
    • LR Sensor circuit terminal 20
    • RR Sensor circuit terminal 31
    • If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the wheel speed sensor.
  3. Test for less than 1 volt between the signal circuit terminals of the appropriate sensor listed below and ground.
    • LR Sensor circuit terminal 33
    • RR Sensor circuit terminal 19
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the wheel speed sensor.
  4. Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground.
    • LR Sensor circuit terminal 20
    • RR Sensor circuit terminal 31
    • If less than the specified value, test the low reference circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.
  5. Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground.
    • LR Sensor circuit terminal 33
    • RR Sensor circuit terminal 19
    • If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, test or replace the wheel speed sensor.
  6. Ignition OFF, disconnect the harness connector at the appropriate WSS.
  7. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below.
    • LR Sensor circuit terminals 20 at the EBCM harness connector, and terminal A at the WSS harness connector
    • RR Sensor circuit terminals 31 at the EBCM harness connector, and terminal A at the WSS harness connector
    • If greater than the specified value, test the low reference circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
  8. Test for less than 2 ohms between the appropriate signal circuit terminals listed below.
    • LR Sensor circuit terminals 33 at the EBCM harness connector, and terminal B at the WSS harness connector
    • RR Sensor circuit terminals 19 at the EBCM harness connector, and terminal B at the WSS harness connector
    • If greater than the specified value, test the signal circuit for an open or high resistance. If the circuit tests normal, test or replace the wheel speed sensor.
  9. If all circuits test normal, replace the EBCM.
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