Inspection Using An Oscilloscope (Reference)

Shift solenoid A signal 

PCM terminals 

• 1A^*1 , 1B^*2 (+)-body ground (-)

Oscilloscope setting 

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition 

• 4GR
  Fig 1: Identifying Voltage Graph - Shift Solenoid Signal

  Courtesy of MAZDA MOTORS CORP.

Shift solenoid B signal 

PCM terminals 

• 1E^*1 , 1C^*2 (+)-body ground (-)

Oscilloscope setting 

• 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition 

• 1GR
  Fig 2: Identifying Voltage Graph - Shift Solenoid B Signal

  Courtesy of MAZDA MOTORS CORP.

Shift solenoid C signal 

PCM terminals 

² 1F^*1 , 1D^*2 (+)-body ground (-)

Oscilloscope setting 

² 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition 

² 1GR or 2GR

Pressure control solenoid (+) signal 

PCM terminals 

• 1M^*1 , 1G^*2 (+)-body ground (-)

Oscilloscope setting 

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• All of the following conditions are met.
  • Ignition switch is turned to the ON position. (engine off)
  • P or N position
  • CTP
    Fig 4: Identifying Voltage Graph - Pressure Control Solenoid

    Courtesy of MAZDA MOTORS CORP.

Pressure control solenoid (-) signal 

PCM terminals 

• 1N^*1 , 1H^*2 (+)-body ground (-)

Oscilloscope setting 

• 200 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• All of the following conditions are met.
  • Ignition switch is turned to the ON position. (engine off)
  • P or N position
  • CTP
    Fig 5: Identifying Voltage Graph - Pressure Control Solenoid

    Courtesy of MAZDA MOTORS CORP.

Vehicle speed signal (ATX) 

PCM terminals 

1AW ^*1  , 1J ^*2  (+)-body ground (-) 

Oscilloscope setting 

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

Vehicle condition 

Vehicle speed is 32 km/h {20 mph}. 

Vehicle speed signal (MTX) 

PCM terminals 

• 2M (+)-2N (-)

Oscilloscope setting 

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

Vehicle condition 

• Vehicle speed is 10 km/h {6.2 mph}.
  Fig 7: Identifying Voltage Graph - Vehicle Speed Signal (MTX)

  Courtesy of MAZDA MOTORS CORP.

Input/turbine speed sensor (+) signal 

PCM terminals 

• 1AO^*1 , 1M^*2 (+)-body ground (-)

Oscilloscope setting 

• 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm-up (no load, P/S off, A/C off)
  Fig 8: Identifying Voltage Graph - Input/Turbine Speed Sensor

  Courtesy of MAZDA MOTORS CORP.

Input/turbine speed sensor (-) signal 

PCM terminals 

• 1AG^*1 , 1Q^*2 (+)-body ground (-)

Oscilloscope setting 

• 500 mV/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm-up (no load, P/S off, A/C off)
  Fig 9: Identifying Voltage Graph - Input/Turbine Speed Sensor

  Courtesy of MAZDA MOTORS CORP.

Cooling fan control signals 

PCM terminals 

• 1Y^*1 , 1W^*3 , 1R^*4 (+)-body ground (-)

Oscilloscope setting 

• 5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (engine speed approx. 700 RPM, A/C ON)
  Fig 10: Identifying Voltage Graph - Cooling Fan Control Signals

  Courtesy of MAZDA MOTORS CORP.

APP signal 

Accelerator pedal is released 

Accelerator pedal is depressed 

PCM terminals 

• 1AC^*1 , 1AL^*3 , 1AO^*4 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Ignition switch is turned to the ON position. (engine off)
  Fig 12: Identifying Voltage Graph - Accelerator Pedal

  Courtesy of MAZDA MOTORS CORP.

HO2S (front) heater control signal (California emission regulation applicable model) 

PCM terminals 

• 2BG(+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 13: Identifying Voltage Graph - HO2S (Front) Heater Control Signal

  Courtesy of MAZDA MOTORS CORP.

HO2S (front) heater control signal (except for California emission regulation applicable model) 

PCM terminals 

• 2G^*3 , 2BG^*4 (+)-body ground (-)

Oscilloscope setting 

• 5 V/DIV (Y), 125 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 14: Identifying Voltage Graph - HO2S (Front) Heater Control Signal

  Courtesy of MAZDA MOTORS CORP.

CMP sensor signal 

PCM terminals 

• 2S^*1*4 , 2V^*3 (+)-body ground (-)

Oscilloscope setting 

• 1 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 15: Identifying Voltage Graph - CMP Sensor Signal

  Courtesy of MAZDA MOTORS CORP.

CKP sensor signal 

PCM terminals 

• 2W^*1*4 , 2U^*3 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 16: Identifying Voltage Graph - CKP Sensor Signal

  Courtesy of MAZDA MOTORS CORP.

OCV signal 

PCM terminals 

• 2E^*1*4 , 2AF^*3 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 17: Identifying Voltage Graph - OCV Signal

  Courtesy of MAZDA MOTORS CORP.

HO2S (front) signal (except for California emission regulation applicable model) 

PCM terminals 

• 2AG(+)-body ground (-)

Oscilloscope setting 

• 0.2 V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 18: Identifying HO2S (Front) Signal

  Courtesy of MAZDA MOTORS CORP.

Generator output voltage signal 

PCM terminals 

• 2AJ^*1*4 , 2AM^*3 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 19: Generator Output Voltage Signal Graph

  Courtesy of MAZDA MOTORS CORP.

Purge control signal 

PCM terminals 

• 2C^*1*4 , 2AN^*3 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 20: Identifying Voltage Graph - Purge Control Signal

  Courtesy of MAZDA MOTORS CORP.

Generator field coil control signal 

PCM terminals 

• 2AI^*1*4 , 2AQ^*3 (+)-body ground (-)

Oscilloscope setting 

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

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 21: Identifying Voltage Graph - Generator Field Coil Control Signal

  Courtesy of MAZDA MOTORS CORP.

Fuel injection control 

PCM terminals 

• Fuel injection No. 1: 2BB(+)-body ground (-)
• Fuel injection No. 2: 2BC(+)-body ground (-)
• Fuel injection No. 3: 2BD(+)-body ground (-)
• Fuel injection No. 4: 2AZ(+)-body ground (-)

Oscilloscope setting 

• 10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (no load, P/S off, A/C off)
  Fig 22: Identifying Voltage Graph - Fuel Injection Control

  Courtesy of MAZDA MOTORS CORP.

IGT1, IGT2, IG3, IG4 control signals 

PCM terminals ^*1*4 

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

PCM terminals ^*3 

• IGT1 (No. 1): 2BE(+)-body ground (-)
• IGT2 (No. 2): 2BF(+)-body ground (-)
• IGT3 (No. 3): 2BG(+)-body ground (-)
• IGT4 (No. 4): 2BH(+)-body ground (-)

Oscilloscope setting 

• 10 V/DIV (Y), 25 ms/DIV (X), DC range

Vehicle condition 

• Idle after warm up (engine speed approx. 650 RPM, no load)

*1 : California emission regulation applicable model

*2 : Except for California emission regulation applicable model

*3 : Except for California emission regulation applicable LF ATX model

*4 : except for California emission regulation applicable LF MTX, L3 model