Inspection Using an Oscilloscope (Reference) Purpose

Vehicle Speed Signal
- PCM terminal: 1C(+)-4AN(-)
- Oscilloscope setting: 2V/DIV (Y), 20 ms/DIV (X), DC range
- Vehicle condition: Driving speed 20 km/h [12.4 mph]




Engine Speed Signal
- PCM terminal: 20(+)-4D(-)
- Oscilloscope setting: 2V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




HO2S Signal (Front RH/LH)
- PCM terminal: 31, 3M(+)-3AB(-)
- Oscilloscope setting: 0.1 V/DIV (Y), 500 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




SGC Signal
- PCM terminal: 4F(+)-4D(-)
- Oscilloscope setting: 2 V/DIV (Y), 100 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IAC Control Signal
- PCM terminal: 4M(+)-4D(-)
- Oscilloscope setting: 2 V/DIV (Y), 2 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Fuel Injector Control Signal
- PCM terminal
- No.1: 4Q(+)-4AB(-)
- No.2: 4U(+)-4AB(-)
- No.3: 4Y(+)-4AB(-)
- No.4: 4AC(+)-4AB(-)
- No.5: 4AG(+)-4AB(-)
- No.6: 4AK(+)-4AB(-)

- Oscilloscope setting: 2 V/DIV (Y), 1 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IGT Control Signal
- PCM terminal
- No.1: 45(+)-4AF(-)
- No.2: 4W(+)-4AF(-)
- No.3: 4AA(+)-4AF(-)
- No.4: 4AE(+)-4AF(-)
- No.5: 4A1(+)-4AF(-)
- No.6: 4AM(+)-4AF(-)

- Oscilloscope setting: 0.5 V/DIV (Y), 5 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Ne Signal
- PCM terminal: 4AH(+)-4AL(-)
- Oscilloscope setting: 2 V/DIV (Y), 5 ms/DIV (X), AC range
- Vehicle condition: idle after warm up