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Open circuit

If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
- MAF/IAT sensor terminal D and PCM terminal 1AT^{*1 *2} , 1AH^*3
- MAF/IAT sensor terminal E and PCM terminal 1AS^*1 1AV^*2 , 1AA^*3
  
  Fig 1: PCM Connector Terminal Identification
  Courtesy of MAZDA MOTORS CORP.