Open circuit

WARNING: This page is about a different variant/trim than selected.

If there is no continuity in the following wiring harnesses, there is an open circuit. Repair or replace the wiring harness.
- Front HO2S terminal 1A and PCM terminal 2AD
- Front HO2S terminal 1B and PCM terminal 2AC
- Front HO2S terminal 1C and PCM terminal 2Z
- Front HO2S terminal 2B and main relay terminal C
- Front HO2S terminal 2D and PCM terminal 2BG
  
  Fig 1: PCM Connector Terminal Identification
  Courtesy of MAZDA MOTORS CORP.

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Rear HO2S terminal A and PCM terminal 2Q
- Rear HO2S terminal Band PCM terminal 1BC

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- Rear HO2S terminal C and ignition switch
- Rear HO2S terminal D and PCM terminal 2BE
  
  Fig 1: PCM Connector Terminal Identification
  Courtesy of MAZDA MOTORS CORP.