Oxygen Sensor Relay: Testing and Inspection

HO2S Heater Relay (Integration Type Relay)

1. Disconnect negative cable at battery.




2. Remove integration relay No.2 (1) from fuse box No.2 (2).

3. Check that there is no continuity between terminals "[A]-1" and "[B]-8" of relay.
If there is continuity, replace relay.




4. Connect battery positive (+) terminal to "[B]-7" terminal of relay. Connect battery negative (-) terminal to "[B]-6" terminal of relay. Check for continuity between terminal "[A]-1" and "[B]-8". If there is no continuity when relay is connected to the battery, replace integration relay No.2.