Circuit Open/Short Inspection

Fig 1: Identifying MAF/IAT Sensor Connector Terminals

Courtesy of MAZDA MOTORS CORP.

1. Disconnect the PCM connector. (See PCM REMOVAL/INSTALLATION ).
2. Inspect the following wiring harnesses for an open or short circuit. (Continuity inspection)
   Fig 2: Identifying PCM Wiring Harness-Side Connector Terminals

   Courtesy of MAZDA MOTORS CORP.

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 1 AT
  • MAF/IAT sensor terminal E and PCM terminal 1AR

Short circuit 

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  • MAF/IAT sensor terminal E and power supply
  • MAF/IAT sensor terminal D and power supply
  • MAF/IAT sensor terminal D and body ground