Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)







Cooling fan control signal




PCM terminals
- 1 R (+)-body ground (-)
Oscilloscope setting
- 5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up

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

APP sensor signal

Accelerator pedal is released




Accelerator pedal is depressed




PCM terminals
- 1AO (+)-body ground (-)
Oscilloscope setting
- 2.5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Ignition switch is turned to the ON position.
(engine off)

OCV 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

CMP signal




PCM terminals
- 2S (+)-body ground (-)
Oscilloscope setting
- 1 V/DIV (Y), 25 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up

CKP 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

Generator field coil control signal




PCM terminals
- 2M (+)-body ground (-)
Oscilloscope setting
- 0.5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, A/C off)

Generator output voltage signal




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

Oscilloscope setting
- 2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up

IGT1, IGT2, IGT3, IGT4 signals




PCM terminals
- IGT1 (No.1): 2G (+)-body ground (-)
- 10T2 (No.2): 2K (+)-body ground (-)
- IGT3 (No.3): 2L (+)-body ground (-)
- IGT4 (No.4): 2H (+)-body ground (-)

Oscilloscope setting
- 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up

Fuel injection signal




PCM terminals
- Fuel Injection No.1: 2BB (+)-body ground (-)
- Fuel Injection No.2: 2BC (+)-body ground (-)
- Fuel Injection No.3: 2BD (+)-body ground (-)

Oscilloscope setting
- 4V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up

Front HO2S heater control signal




PCM terminals
- 2A (+)-body ground (-)
Oscilloscope setting
- 5 V/DIV (Y), 200 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, A/C off)

Rear HO2S heater control signal




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

Oscilloscope setting
- 5 V/DIV (Y), 1 s/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, A/C off)