Open circuit
WARNING: This page is about a different car, the 2004 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
- If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- HO2S terminal C and main relay terminal E
- HO2S terminal D and PCM terminal 2C
Courtesy of MAZDA MOTORS CORP.