Circuit/System Testing

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 0 volts between the low reference circuit terminals of the appropriate sensor listed below and ground.
   • LF Sensor circuit terminal 8
   • RF Sensor circuit terminal 6
   • LR Sensor circuit terminal 2
   • RR Sensor circuit terminal 12
   • If not the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
3. Test for 0 volts between the signal circuit terminals of the appropriate sensor listed below and ground.
   • LF Sensor circuit terminal 9
   • RF Sensor circuit terminal 5
   • LR Sensor circuit terminal 3
   • RR Sensor circuit terminal 11
   • If not 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 8
   • RF Sensor circuit terminal 6
   • LR Sensor circuit terminal 2
   • RR Sensor circuit terminal 12
   • If not the specified value, test the low reference circuit for a short to ground. If the circuit tests normal, replace the EBCM.
5. Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground.
   • LF Sensor circuit terminal 9
   • RF Sensor circuit terminal 5
   • LR Sensor circuit terminal 3
   • RR Sensor circuit terminal 11
   • If not the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the EBCM.
6. Test for 850-1350 ohms between the wheel speed sensor circuit terminals of the appropriate sensor listed below.
   • LF Sensor circuit terminals 8 and 9
   • RF Sensor circuit terminals 5 and 6
   • LR Sensor circuit terminals 2 and 3
   • RR Sensor circuit terminals 11 and 12
   • If not within the specified range, test the low reference and signal circuits for an open/high resistance. If the circuit tests normal, replace the wheel speed sensor.
7. If all circuits test normal, replace the EBCM.