Circuit Open/Short Inspection

1. Disconnect the PCM connectors.
2. Disconnect the MAF/IAT sensor connector.
3. Inspect the following wiring harnesses for open or short circuit. (Continuity inspection)

Fig 1: Identifying MAF/IAT And PCM Sensor Connector Terminals

Courtesy of MAZDA MOTORS CORP.

Open circuit 

• If there is no continuity in the following wiring harnesses, 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 in the following wiring harnesses, there is a short circuit. Repair or replace the wiring harness.
  • MAF/IAT sensor terminal D and body ground
  • MAF/IAT sensor terminal D and power supply