Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)

Throttle control (+) signal




- PCM terminals: 2A (+)-Negative battery terminal (-)
- Oscilloscope setting: 5 V/DIV (Y), 1 minute/DIV (X), DC range
- Vehicle condition: Idle (Accelerator pedal released)

Throttle control (-) signal




- PCM terminals: 2B (+)-Negative battery terminal (-)
- Oscilloscope setting: 5 V/DIV (Y), 1 minute/DIV (X), DC range
- Vehicle condition: Idle (Accelerator pedal released)

Purge control signal




- PCM terminals: 2C (+)-Negative battery terminal (-)
- Oscilloscope setting: 2 V/DIV (Y), 0.1 second/DIV (X), DC range
- Vehicle condition: Idle after warm-up

OCV control signal




- PCM terminals: 2E (+)-Negative battery terminal (-)
- Oscilloscope setting: 2.5 V/DIV (Y), 1 minute/DIV (X), DC range
- Vehicle condition: Idle after warm-up

Vehicle speed signal




- PCM terminals: 20 (+)-Negative battery terminal (-)
- Oscilloscope setting: 1 V/DIV (Y), 10 minutes/DIV (X), DC range
- Vehicle condition: Vehicle speed is 10 km/h {6.2 mph}

CMP signal




- PCM terminals: 2S (+)-Negative battery terminal (-)
- Oscilloscope setting: 2 V/DIV (Y), 50 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm-up

CKP signal




- PCM terminals: 2W (+)-Negative battery terminal (-)
- Oscilloscope setting: 2 V/DIV (Y), 10 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm-up

Generator field coil control signal




- PCM terminals: 2AI (+)-Negative battery terminal (-)
- Oscilloscope setting: 0.5 V/DIV (Y), 1 minute/DIV (X), DC range
- Vehicle condition: Idle after warm-up

Generator output voltage signal




- PCM terminals: 2AJ (+)-Negative battery terminal (-)
- Oscilloscope setting: 2 V/DIV (Y), 1 minute/DIV (X), DC range
- Vehicle condition: Idle after warm-up

Ignition timing signals




- PCM terminals
- IGT1 (No.1): 2BA (+)-Negative battery terminal(-)
- IGT2 (No.2): 2AW (+)-Negative battery terminal(-)
- IGT3 (No.3): 2AX (+)-Negative battery terminal(-)
- IGT4 (No.4): 2AT (+)-Negative battery terminal(-)

- Oscilloscope setting: 2 V/DIV (Y), 50 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm-up

Fuel injection signals




- PCM terminals
- Fuel Injection No.1: 2BB (+)-Negative battery terminal (-)
- Fuel Injection No.2: 2BC (+)-Negative battery terminal (-)
- Fuel Injection No.3: 2BD (+)-Negative battery terminal (-)
- Fuel Injection No.4: 2AZ (+)-Negative battery terminal (-)

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

Front HO2S heater control signal




- PCM terminals: 2BG (+)-Negative battery terminal (-)
- Oscilloscope setting: 5 V/DIV (Y), 50 minutes/DIV (X), DC range
- Vehicle condition: Idle after warm-up (no load)