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Open circuit

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAP sensor terminal A and PCM terminal 2AY^*1 ,2P^*2 , 2AA^*3
- MAP sensor terminal C and PCM terminal 2AU^*1 ,2AR^*2 , 2W^*3
- MAP sensor terminal D and PCM terminal 2AG^*1 ,2AG^*2 ,2AL^*3
  
  Fig 1: PCM Connector Terminal Identification
  Courtesy of MAZDA MOTORS CORP.