Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)




CKP
- PCM terminal: 27 (+) - 1 (-)
- Oscilloscope setting: 4 V/DIV (Y), 2.5 ms/DIV (X), AC range
- Vehicle condition: idle after warm up.




CMP
- PCM terminal: 28 (+) - 2 (-)
- Oscilloscope setting: 0.5 V/DIV (Y),10 ms/DIV (X), AC range
- Vehicle condition: idle after warm up




HO2S signal (front, RH/LH)
- PCM terminal: 18, 19 (+) - 20 (-)
- Oscilloscope setting: 0.2 V/DIV (Y), 200 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Engine speed signal (output)
- PCM terminal: 21 (+) - 100 (-)
- Oscilloscope setting: 2 V/DIV (Y), 5 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Generator field coil signal
- PCM terminal: 36 (+) - 100 (-)
- Oscilloscope setting: 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Fuel injection signal
- PCM terminal
- No. 1:76 (+) - 100 (-)
- No. 2:50 (+) - 100 (-)
- No. 3:75 (+) - 100 (-)
- No. 4:49 (+) - 100 (-)
- No. 5:74 (+) - 100 (-)
- No. 6:48 (+) - 100 (-)

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




Generator output voltage signal
- PCM terminal: 63 (+) - 100 (-)
- Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IGT signal
- PCM terminal
- IGT1 52 (+) - 100 (-)
- IGT2 104 (+) - 100 (-)
- IGT3 102 (+) - 100 (-)
- IGT4 78 (+) - 100 (-)
- IGT5 103 (+) - 100 (-)
- IGT6 101 (+) - 100 (-)

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




Water temperature gauge control signal
- PCM terminal: 70 (+) - 100 (-)
- Oscilloscope setting: 1 V/DIV (Y), 40 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Cooling fan control signal
- PCM terminal: 69 (+) - 100 (-)
- Oscilloscope setting: 1 V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Vehicle speed signal
- PCM terminal: 79 (+) - 22 (-)
- Oscilloscope setting: 1 V/DIV (Y), 25 ms/DIV(X), DC range
- Vehicle condition: Driving speed 60 km/h [37 mph]




Purge control signal
- PCM terminal: 85 (+) - 100 (-)
- Oscilloscope setting: 2 V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IAC control signal
- PCM terminal: 88 (+) - 22 (-)
- Oscilloscope setting: 2 V/DIV (Y), 0.1ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Torque reduction inhibit signal
- PCM terminal: 90 (+) - 100 (-)
- Oscilloscope setting: 1V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Torque reduction request signal
- PCM terminal: 91 (+) - 100 (-)
- Oscilloscope setting: 1 V/DIV (Y), 2 ms/DIV (X), DC range
- Vehicle condition: idle after warm up