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HOMESERVICE MANUALSMAZDA2013MX-5 MIATA GRAND TOURING, AUTOMATIC TRANSREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEENGINE CONTROL SYSTEMSPCM INSPECTIONINSPECTION USING AN OSCILLOSCOPE (REFERENCE)
2013 Mazda MX-5 Miata Grand Touring, Automatic Trans

Inspection Using An Oscilloscope (Reference)

2013 Mazda MX-5 Miata Grand Touring, Automatic TransSECTION Inspection Using An Oscilloscope (Reference)

Throttle control (+) signal 

PCM terminals 

  • 2A (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

  • Idle (Accelerator pedal released)

Throttle control (-) signal 

Fig 1: Screen Display - Throttle Control (+) Signal Waveform
G06151043Courtesy of MAZDA MOTORS CORP.

PCM terminals 

  • 2B (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

  • Idle (Accelerator pedal released)
    Fig 2: Screen Display - Throttle Control (-) Signal Waveform
    G06151043Courtesy of MAZDA MOTORS CORP.

Purge control signal 

PCM terminals 

  • 2C (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 2 V/DIV (Y), 0.1 s/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 3: Screen Display - Purge Control Signal Waveform
    G06151045Courtesy of MAZDA MOTORS CORP.

OCV control signal 

PCM terminals 

  • 2E (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 2.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 4: Screen Display - OCV Signal Waveform
    G06151046Courtesy of MAZDA MOTORS CORP.

CMP signal 

PCM terminals 

  • 2S (+)-Negative battery terminal (-}

Oscilloscope setting 

  • 2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up

CKP signal 

Fig 5: Screen Display - CMP Signal Waveform
G06151047Courtesy of MAZDA MOTORS CORP.

PCM terminals 

  • 2W (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 2 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 6: Screen Display - CKP Signal Waveform
    G06151048Courtesy of MAZDA MOTORS CORP.

Generator field coil control signal 

PCM terminals 

  • 2AI (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 7: Screen Display - Generator Field Coil Control Signal Waveform
    G06151049Courtesy of MAZDA MOTORS CORP.

Generator output voltage signal 

PCM terminals 

  • 2AJ (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 2 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 8: Screen Display - Generator Output Voltage Signal Waveform
    G06151050Courtesy of MAZDA MOTORS CORP.

Ignition timing signals 

PCM terminals 

  • IGT1 (No. 1):2BA(+)-Negative battery terminal (-)
  • IGT2 (No. 2): 2AW (+)-Negative battery terminal (-)
  • IGT3 (No. 3): 2AX (+)-Negative battery terminal (-)
  • IGT4 (No. 4): 2AT (+)-Negative battery terminal (-)

Oscilloscope setting 

Fig 9: Screen Display - Ignition Timing Signal Waveform
G06151051Courtesy of MAZDA MOTORS CORP.
  • 2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up

Fuel injection signals 

PCM terminals 

  • Fuel Injection No. 1: 2BB (+)-Negative battery terminal (-)
  • Fuel Injection No. 2: 2BC (+)-Negative battery terminal (-)
  • Fuel Injection No. 3: 2BD (+)-Negative battery terminal (-)
  • Fuel Injection No. 4: 2AZ (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 10 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up
    Fig 10: Screen Display - Fuel Injection Signal Waveform
    G06151052Courtesy of MAZDA MOTORS CORP.

A/F sensor heater control signal 

PCM terminals 

  • 2BG (+)-Negative battery terminal (-)

Oscilloscope setting 

  • 5 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition 

  • Idle after warm-up (no load)
    Fig 11: Screen Display - A/F Sensor Heater Control Signal Waveform
    G06151053Courtesy of MAZDA MOTORS CORP.
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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.