Circuit/System Testing
IMPORTANT:
It is recommend that Component Testing is performed before Circuit Testing when diagnosing wheel speed sensors.
- Ignition OFF, disconnect the harness connector at the EBCM.
- Ignition ON, test for less than 1 volt between the low reference circuit terminal of the appropriate sensor listed below and ground.
- LF Sensor circuit terminal 13
- RF Sensor circuit terminal 27
- LR Sensor circuit terminal 41
- RR Sensor circuit terminal 44
- If greater than the specified value, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Test for less than 1 volt between the signal circuit terminals of the appropriate sensor listed below and ground.
- LF Sensor circuit terminal 12
- RF Sensor circuit terminal 26
- LR Sensor circuit terminal 42
- RR Sensor circuit terminal 43
- If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the EBCM.
- Ignition OFF, test for infinite resistance between the low reference terminals of the appropriate sensor listed below and ground.
- LF Sensor circuit terminal 13
- RF Sensor circuit terminal 27
- LR Sensor circuit terminal 41
- RR Sensor circuit terminal 44
- 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.
- Test for infinite resistance between the following signal circuit terminals of the appropriate sensor listed below and ground.
- LF Sensor circuit terminal 12
- RF Sensor circuit terminal 26
- LR Sensor circuit terminal 42
- RR Sensor circuit terminal 43
- 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.
- If all circuits test normal, replace the EBCM.