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 ms/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 ms/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 s/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 ms/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 ms/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 ms/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 ms/DIV (X), DC range
Vehicle condition
- Idle after warm-up
Generator field coil control signal PCM terminals
- 2A1 (+)-Negative battery terminal (-)
Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/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 ms/DIV (X), DC range
Vehicle condition
- Idle after warm-up
Detection Condition/Possible Cause:
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 ms/DIV (X), DC range Vehicle condition
- Idle after warm-up
Step 1:
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 ms/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 ms/DIV (X), DC range
Vehicle condition
- Idle after warm-up (no load)