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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSINTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTIONCIRCUIT OPEN/SHORT INSPECTION
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

Circuit Open/Short Inspection

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Circuit Open/Short Inspection
Fig 1: Identifying MAF/IAT Sensor Connector Terminals
G06151076Courtesy 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
    G06151077Courtesy 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
RENDER: 1.0x

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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.