2013 Mazda MX-5 Miata Grand Touring, Automatic TransFACTORY OEM SERVICE PROCEDURE

Circuit Open/Short Inspection

Fig 1: Identifying Variable Tumble Shutter Valve Switch Wiring Harness Side Connector Terminals
G07877775Courtesy of MAZDA MOTORS CORP.
  1. Disconnect the PCM connector.
  2. Inspect the following harness for an open or short wiring. (Continuity inspection)
    Fig 2: Identifying PCM Wiring Harness-Side Connector Terminals
    G07877776Courtesy of MAZDA MOTORS CORP.

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 2AE
    • Variable tumble shutter valve switch terminal B and body ground

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 body ground
    • Variable tumble shutter valve switch terminal B and power supply
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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