DR-6B Checking Oxygen Sensor

1. With oxygen sensor disconnected, turn ignition switch Off.
2. Disconnect logic module blue electrical connector.
3. Connect an ohmmeter between terminal No. 18 of blue logic module electrical connector and oxygen sensor electrical connector, then turn ignition switch to Run position.
4. If ohmmeter does not indicate continuity, locate and repair open circuit in wire of terminal No. 18 to oxygen sensor.
5. If ohmmeter indicates continuity, replace logic module.
CAUTION: Before replacing the logic module make sure the terminal in cavity No. 18 is not crushed so that it cannot touch the logic module pin.