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

Steering Angle Sensor Inspection

  1. Remove the column cover. (See COLUMN COVER REMOVAL/INSTALLATION )
  2. Measure the voltage between steering angle sensor terminal B and ground.
    • If there is any malfunction, inspect the wiring harness between steering angle sensor terminal B and battery, then repair or replace if necessary.

      Standard voltage B+ 

  3. Turn the ignition switch to the ON position, then measure the voltage between steering angle sensor terminal A and ground.
    Fig 1: Steering Angle Sensor Connector Terminals
    G06151354Courtesy of MAZDA MOTORS CORP.
    • If there is any malfunction, inspect the wiring harness between steering angle sensor terminal A and ignition switch, then repair or replace if necessary.

      Standard voltage B+ 

  4. Measure the voltage between steering angle sensor terminal H and the ground.
    • If there is any malfunction, inspect the wiring harness between steering angle sensor terminal H and ground point, then repair or replace if necessary.

      Standard voltage 0V 

  5. Turn the ignition switch to the LOCK position.
  6. Connect the M-MDS to the DLC-2.
    Fig 2: DLC-2
    G06151222Courtesy of MAZDA MOTORS CORP.
  7. Select the "SWA_POS" PID.
  8. Verify the SWA_POS changes when the steering wheel is turned to the left and right.
    • If there is any malfunction, replace the steering angle sensor.

      Standard 

      When the steering wheel is turned to the right: SWA_POS changes positively. 

      When the steering wheel is turned to the left: SWA_POS changes negatively. 

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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