Circuit Open/Short Inspection

1. Disconnect the PCM connector.
2. Inspect the following harness for an open or short wiring. (Continuity inspection)

Open circuit 

• If there is no continuity, there is an open circuit. Repair or replace the wiring harness.
  • Variable tumble shutter valve switch terminal A and PCM terminal 2W
  • Variable tumble shutter valve switch terminal B and PCM terminal 2AA
  • Variable tumble shutter valve switch terminal C and PCM terminal 2AE

Short circuit 

• If there is continuity, there is a short circuit. Repair or replace the wiring harness.
  • Variable tumble shutter valve switch terminal A and power supply
  • Variable tumble shutter valve switch terminal A and body ground
  • Variable tumble shutter valve switch terminal B and power supply
  • Variable tumble shutter valve switch terminal C and power supply
  • Variable tumble shutter valve switch terminal C and body ground
    Fig 1: Identifying Variable Tumble Shutter Valve Switch Connector Terminals

    Courtesy of MAZDA MOTORS CORP.