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Open circuit

If there is no continuity, the circuit is open. Repair or replace the harness.
- Reference voltage circuit (ECT sensor connector terminal A and PCM connector terminal 4P through common connector.)
- GND circuit (ECT sensor connector terminal B and PCM connector terminal 4O through common connector.)
Fig 1: Identifying ECT Sensor Connector Terminals
Courtesy of MAZDA MOTORS CORP.