Open Circuit

If there is no continuity, the circuit is open. Repair or replace the harness.
- GND circuit (HO2S connector D and PCM connector terminal 3J through common connector (Front)).
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector (Front)).
- GND circuit (HO2S connector terminal D and PCM connector terminal 3P (Rear)).
- Power circuit (HO2S connector terminal C and ignition switch (IG1) circuit through common connector (Rear)).
Fig 1: Identifying Front & Rear Heated Oxygen Sensor [BP, BP With TC] Harness Side Connector Terminals
Courtesy of MAZDA MOTORS CORP.