Oxygen Sensor Relay: Testing and Inspection

INSPECTION

1. REMOVE A/F SENSOR HEATER RELAY
2. INSPECT A/F SENSOR HEATER RELAY




a. Inspect the relay continuity.
1. Using an ohmmeter, check that there is no continuity between terminals 1 and 2.

If there is continuity, replace the relay.

2. Check that there is continuity between terminals 3 and 5.

If there is no continuity, replace the relay.




b. Inspect the relay operation.
1. Apply battery positive voltage across terminals 3 and 5.
2. Using an ohmmeter, check that there is continuity between terminals 1 and 2.

If there is no continuity, replace the relay.

3. REINSTALL A/F SENSOR HEATER RELAY