Inspection Using an Oscilloscope (Reference) Purpose

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




Engine Speed Signal
- PCM terminal: 1AJ(+)AD(-)
- Oscilloscope setting: 2 V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




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




Input/Turbine Speed Signal
- PCM terminal: 2P(+)-2T(-)
- Oscilloscope setting: 0.5 V/DIV (Y), 2 ms/DIV (X) AC range
- Vehicle condition: idle after warm up




HO2S Signal (Front RH/LH)
- PCM terminal: 31, 3M(+)-3AB(-)
- Oscilloscope setting: 0.2 V/DIV (Y), 0.2 s/DIV (X), DC range
- Vehicle condition: idle after warm up




SGC Signal
- PCM terminal: 4F(+)-4D(-)
- Oscilloscope setting: 2 V/DIV (Y), 200 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IAC Control Signal
- PCM terminal: 4AA(+)-4W(-)
- 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), 20 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




IGT Control Signal
- PCM terminal: 4S(+)-4D(-)
- Oscilloscope setting: 1 V/DIV (Y), 10 ms/DIV (X), DC range
- Vehicle condition: idle after warm up




Ne Signal
- PCM terminal: 4AH(+)-4AL(-)
- Oscilloscope setting: 1 V/DIV (Y), 20 ms/DIV (X), AC range.
- Vehicle condition: idle after warm up