Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)
Ignition coil control signals




PCM terminals
- No.1 cylinders: 2BE (+) - body ground (-)
- No.2 cylinders: 2BF (+) - body ground (-)
- No.3 cylinders: 2BG (+) - body ground (-)
- No.4 cylinders: 2BB (+) - body ground (-)
- No.5 cylinders: 2BC (+) - body ground (-)
- No.6 cylinders: 2BD (+) - body ground (-)

Oscilloscope setting
- 5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

Purge solenoid valve control signal




PCM terminals
- 1 BF (+) - body ground (-)

Oscilloscope setting
- 2.5 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load, during purge control)

CKP sensor signal
(+)




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

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

Vehicle condition
- Idle after warm up (no load)

(-)




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

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

Generator output voltage signal




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

Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
Idle after warm up (no load)

Fan control signal




PCM terminals
- 1 U (+)-body ground (-)

Oscilloscope setting
- 2 V/DIV (Y), 0.2ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

Field coil control signal




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

Oscilloscope setting
- 0.5V/DIV (Y), 5 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

CMP sensor signal
(+)




PCM terminals
- CMP sensor (left bank): 2AA (+)-body ground (-)
- CMP sensor (right bank): 2AD (+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

(-)




PCM terminals
- CMP sensor (left bank): 2AB (+)-body ground (-)
- CMP sensor (right bank): 2AE (+)-body ground(-)

Oscilloscope setting
- 1 V/DIV (Y), 20 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

Fuel injection signals

PCM terminals




- No.1: 21 (+) - body ground (-)
- No.2: 2J (+) - body ground (-)
- No.3: 2k (+) - body ground (-)
- No.4: 2E (+) - body ground (-)
- No.5: 2F (+) - body ground (-)
- No.6: 2G (+) - body ground (-)

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

Vehicle condition
Idle after warm up (no load)

HO2S signals




PCM terminals
- Front HO2S (right bank): 2AK (+)-body ground(-)
- Front HO2S (left bank): 2AL (+)-body ground (-)
- Rear HO2S (right bank): 2AG (+)-body ground(-)
- Rear HO2S (left bank): 2AH (+)-body ground (-)

Oscilloscope setting
- 0.5V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)

HO2S heater control signal




PCM terminals
- Front HO2S heater (right bank): 2AW (+)-body ground (-)
- Front HO2S heater (left bank): 2AS (+)-body ground (-)
- Rear HO2S heater (right bank): 2AT (+)-body ground (-)
- Rear HO2S heater (left bank): 2A0 (+)-body ground (-)

Oscilloscope setting
- 5V/DIV (Y), 500 ms/DIV (X), DC range

Vehicle condition
- Idle after warm up (no load)