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Circuit/System Testing

WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
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 34
    • RF Sensor circuit terminal 6
    • If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  3. Test for less than 1 volt between the signal circuit terminals of the appropriate sensor listed below and ground.
    • LF Sensor circuit terminal 21
    • RF Sensor circuit terminal 18
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
  4. Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground.
    • LF Sensor circuit terminal 34
    • RF Sensor circuit terminal 6
    • 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 21
    • RF Sensor circuit terminal 18
    • 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.
    • LF Sensor circuit terminals 34 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
    • 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.
    • LF Sensor circuit terminals 21 at the EBCM harness connector, and terminal 2 at the WSS harness connector
    • RF Sensor circuit terminals 18 at the EBCM harness connector, and terminal 2 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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