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)