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 in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
- Front HO2S terminal A and PCM terminal 2AG
- Front HO2S terminal B and PCM terminal 2AC
- Front HO2S terminal C and PCM terminal 2G
- Front HO2S terminal D and main relay terminal E
Fig 1: Identifying Front HO2S Connector Terminals
Courtesy of MAZDA MOTORS CORP.

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- HO2S terminal A and PCM terminal 2AG
- HO2S terminal B and PCM terminal 2AA