Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)

Generator output voltage signal




PCM terminals
1AB(+)-Body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)

Generator field coil control signal




PCM terminals
- 1 AD(+)-Body ground(-)

Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load, P/S oft, NC oft)

Fuel injector check signal




PCM terminals
- 2B(+)-Body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load, P/S oft, NC off)

CKP sensor signal




PCM terminals
- 2C(+)-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, NC off)

CMP sensor signal




PCM terminals
- 2E(+)-Body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 50 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load, P/S off, NC off)

Fuel injection control




PCM terminals
- Fuel Injection No.1: 3B(+)-Body ground(-)
- Fuel Injection No.2: 3E(+)-Body ground(-)
- Fuel Injection No.3: 3H(+)-Body ground(-)
- Fuel Injection No.4: 3K(+)-Body ground(-)

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

Vehicle condition
- Idle after warm up (no load, P/S off, NC off)

IGT control signals




PCM terminals
- IGT1(No.1): 3W(+)-Body ground(-)
- IGT2(No.2): 3X(+)-Body ground(-)
- I GT3(No.3): 3Z(+)-Body ground(-)
- IGT4(No.4): 3AA(+)-Body ground(-)

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

Vehicle condition
- Idle after warm up (no load, P/S off, NC off)

DCV control signal




PCM terminals
- 4S(+)-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, NC off)

Purge control signal




PCM terminals
- 4T(+)-Body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 10 ms/DIV (X), DC range

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

HO2S (front) heater control signal




PCM terminals
- 4AD(+)-Body ground(-)

Oscilloscope setting
- 2.5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after engine start (no load, P/S off, A/C off)