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Open circuit

If there is no continuity, the circuit is open. Repair or replace the wiring harness.
- CKP sensor terminal A and PCM terminal 2H
- CKP sensor terminal B and PCM terminal 2C
- CKP sensor terminal C and main relay terminal C
  
  Fig 1: Identifying PCM Sensor Connector Terminals
  Courtesy of MAZDA MOTORS CORP.