Inspection Using An Oscilloscope (Reference)

Fan control module signal

PCM terminals

1R (+)-body ground (-)

1AE (+)-body ground (-)

Oscilloscope setting

5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 1: Fan Control Module Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Generator field coil control signal

PCM terminals

1AW (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

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

Fig 2: Generator Field Coil Control Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Generator output voltage signal

PCM terminals

1AX (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 3: Generator Output Voltage Signal Waveform

Courtesy of MAZDA MOTORS CORP.

A/F sensor heater control signal

PCM terminals

2C (+)-body ground (-)

Oscilloscope setting

2 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 4: A/F Sensor Heater Control Signal Waveform

Courtesy of MAZDA MOTORS CORP.

CMP sensor signal

PCM terminals

2S (+)-body ground (-)

Oscilloscope setting

2 V/DIV (Y), 100 ms/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 5: CMP Sensor Signal Waveform

Courtesy of MAZDA MOTORS CORP.

CKP sensor signal

PCM terminals

2W (+)-body ground (-)

Oscilloscope setting

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

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 6: CKP Sensor Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Wastegate control solenoid valve signal

PCM terminals

2AA (+)-body ground (-)

Oscilloscope setting

20 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Ignition switch to the ON position

Fig 7: Wastegate Control Solenoid Valve Signal Waveform

Courtesy of MAZDA MOTORS CORP.

Purge control signal

PCM terminals

2AB (+)-body ground (-)

Oscilloscope setting

10 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Engine speed is 2,000 rpm

Fig 8: Purge Control Signal Waveform

Courtesy of MAZDA MOTORS CORP.

OCV signal

PCM terminals

2AF (+)-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 9: OCV Signal Waveform

Courtesy of MAZDA MOTORS CORP.

IGT1, IGT2, IGT3, IGT4 control signals

PCM terminals

IGT1 (NO.1): 2BA (+)-body ground (-)

IGT2 (NO.2): 2AW (+)-body ground (-)

IGT3 (NO.3): 2AX (+)-body ground (-)

IGT4 (NO.4): 2AT (+)-body ground (-)

Oscilloscope setting

2 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 10: IGT1, IGT2, IGT3, IGT4 Control Signals Waveform

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), 20 ms/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 11: Fuel Injection Control (-) Waveform

Courtesy of MAZDA MOTORS CORP.

Fuel injection control (+)

PCM terminals

Fuel injection NO.1, NO.4: 2BG (+)-body ground (-)

Fuel injection NO.2, NO.3: 2BH (+)-body ground (-)

Oscilloscope setting

20 V/DIV (Y), 400 μs/DIV (X), DC range

Vehicle condition

Idle after warm up (no load, P/S off, A/C off)

Fig 12: Fuel Injection Control (+) Waveform

Courtesy of MAZDA MOTORS CORP.