Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)
VSS signal

Oscilloscope Waveform:

PCM terminals
- 2M, 2N(+)-body ground(-)

Oscilloscope safing
- 1 V/DIV (Y), 10 ms/DIV (X), DC range

Vehicle condition
- Drive the vehicle with approx 10 km/h {6.2 mph}

Purge control signal




PCM terminals
- 2C(+)-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)

OCV control signal




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

Oscilloscope setting
- 2 V/DIV (Y), 0.8 ms/DIV (X), DC range

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

CMP sensor signal




PCM terminals
- 2S(+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 25 ms/DIV (X), DC range

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

CKP sensor signal




PCM terminals
- 2W(+)-body ground(-)

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

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

HO2S (front) signal (California emission regulation applicable ATX model)




PCM terminals
- 2AD(+)-body ground(-)

Oscilloscope setting
- 0.1 V/DIV (Y), 400 ms/DIV (X), DC range

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

Generator field coil control signal




PCM terminals
- 2A1(+)-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 off, A/C off)

Generator output voltage signal




PCM terminals
- 2AJ(+)-body ground(-)

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

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

IGT1, IGT2, IGT3, IGT4 control signals




PCM terminals
- IGT1 (ignition coil No.1): 2BA(+)-body ground(-)
- IGT2 (ignition coil No.2): 2AW(+)-body ground(-)
- IGT3 (ignition coil No.3): 2AX(+)-body ground(-)
- IGT4 (ignition coil No.4): 2AT(+)-body ground(-)

Oscilloscope setting
- 4 V/DIV (Y), 0.01 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: 2BB(+)-body ground(-)
- Fuel Injection No.2: 2BC(+)-body ground(-)
- Fuel Injection No.3: 2BD(+)-body ground(-)
- Fuel Injection No.4: 2AZ(+)-body ground(-)

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

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

HO2S (rear) heater control




PCM terminals
- 2BE(+)-body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 1 s/DIV (X), DC range

Vehicle condition
- Idle (immediately after starting the engine)

HO2S (front) heater control




PCM terminals
- 2BG(+)-body ground(-)

Oscilloscope setting
- 2 V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition
- Idle (immediately after starting the engine)