Open circuit

If there is no continuity, the circuit is open. Repair or replace the harness.
- EGR boost sensor terminal C (harness-side) and 104 pin breakout box terminal 33
- EGR boost sensor terminal B (harness-side) and 104 pin breakout box terminal 37
- EGR boost sensor terminal A (harness-side) and 104 pin breakout box terminal 20

Fig 1: Identifying EGR Boost Sensor Connector

Courtesy of MAZDA MOTORS CORP.