Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)




Vehicle speed signal
- PCM terminal: 58 (+) - 24 (-)
- Oscilloscope setting: 1V/DIV (Y), 25ms/DIV(X), DC range
- Vehicle condition: Driving speed 60 km/h [37 mph]




Engine speed signal (output)
- PCM terminal: 48 (+) - 103 (-)
- Oscilloscope setting: 2V/DIV (Y), 5ms/DIV (X), DC range
- Vehicle condition: idle after warm up




HO2S signal (front, RH/LH)
- PCM terminal: 60, 87 (+) - 91 (-)
- Oscilloscope setting: 0.2V/DIV (Y), 200ms/DIV (X), DC range
- Vehicle condition: idle after warm up




SGC signal
- PCM terminal: 85 (+) - 86 (-)
- Oscilloscope setting: 0.5V/DIV (Y), 10ms/DIV (X), AC range
- Vehicle condition: idle after warm up




IAC control signal
- PCM terminal 83 (+) - 24 (-)
- Oscilloscope setting: 2V/DIV (Y), 0.1ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Fuel injection signal
- PCM terminal
- No.1: 75 (+) - 103 (-)
- No.2: 101 (+) - 103 (-)
- No.3: 74 (+) - 103 (-)
- No.4: 100 (+) - 103 (-)
- No.5: 73 (+) - 103 (-)
- No.6: 99 (+) - 103 (-)

- Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IGT signal
- PCM terminal
- IGT1 26 (+) - 103 (-)
- IGT2 1 (+) - 103 (-)
- IGT3 52 (+) - 103 (-)
- IGT4 27 (+) - 103 (-)
- IGT5 78 (+) - 103 (-)
- IGT6 82 (+) - 103 (-)

- Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
- Vehicle condition: idle after warm up




NE signal
- PCM terminal: 21 (+) - 22 (-)
- Oscilloscope setting: 4V/DIV (Y), 2.5ms/DIV (X), AC range
- Vehicle condition: idle after warm up




Purge control signal
- PCM terminal: 18 (+) - 103 (-)
- Oscilloscope setting: 2V/DIV (Y), 10ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Generator output voltage signal
- PCM terminal: 30 (+) - 103 (-)
- Oscilloscope setting: 2V/DIV (Y), 1ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Generator field coil signal
- PCM terminal: 53 (+) - 103 (-)
- Oscilloscope setting: 0.5V/DIV (Y), 1ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Torque reduction request signal
- PCM terminal: 19 (+) - 103 (-)
- Oscilloscope setting: 1V/DIV (Y), 2ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Torque reduction inhibit signal
- PCM terminal: 20 (+) - 103 (-)
- Oscilloscope setting: 1V/DIV (Y), 10ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Cooling fan control signal
- PCM terminal: 44 (+) - 103 (-)
- Oscilloscope setting: 1V/DIV (Y), 10ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Water temperature gauge control signal
- PCM terminal: 442 (+) - 103 (-)
- Oscilloscope setting: 1V/DIV (Y), 40ms/DIV (X), DC range
- Vehicle condition: idle after warm up