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Circuit/System Testing

IMPORTANT: 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.
    • LF Sensor circuit terminal 37
    • RF Sensor circuit terminal 6
    • LR Sensor circuit terminal 4
    • RR Sensor circuit terminal 35
    • 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.
    • LF Sensor circuit terminal 36
    • RF Sensor circuit terminal 5
    • LR Sensor circuit terminal 3
    • RR Sensor circuit terminal 34
    • 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.
    • LF Sensor circuit terminal 37
    • RF Sensor circuit terminal 6
    • LR Sensor circuit terminal 4
    • RR Sensor circuit terminal 35
    • 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.
    • LF Sensor circuit terminal 36
    • RF Sensor circuit terminal 5
    • LR Sensor circuit terminal 3
    • RR Sensor circuit terminal 34
    • 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 wheel speed sensor.
  7. Test for less than 2 ohms between the appropriate signal circuit terminals listed below.
    • LF Sensor circuit terminals 36 at the EBCM harness connector, and terminal 2 at the WSS harness connector
    • RF Sensor circuit terminals 5 at the EBCM harness connector, and terminal 2 at the WSS harness connector
    • LR Sensor circuit terminals 3 at the EBCM harness connector, and terminal B at the WSS harness connector
    • RR Sensor circuit terminals 34 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.
  8. Test for less than 2 ohms between the appropriate low reference circuit terminals listed below.
    • LF Sensor circuit terminals 37 at the EBCM harness connector, and terminal 1 at the WSS harness connector
    • RF Sensor circuit terminals 6 at the EBCM harness connector, and terminal 1 at the WSS harness connector
    • LR Sensor circuit terminals 4 at the EBCM harness connector, and terminal A at the WSS harness connector
    • RR Sensor circuit terminals 35 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.
  9. If all circuits test normal, replace the EBCM.
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