Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)




Ignition coil control signals
- PCM terminals
- No.1 cylinders: 52 (+) - 26 (-)
- No.2 cylinders: 104 (+) - 26 (-)
- No.3 cylinders: 102 (+) - 26 (-)
- No.4 cylinders: 78 (+) - 26 (-)
- No.5 cylinders: 103 (+) - 26 (-)
- No.6 cylinders: 101 (+) - 26 (-)

- 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
- 85(+) - 26(-)

- Oscilloscope setting
- 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
- 27(+) - 26(-)

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

- Vehicle condition
- Idle after warm up (no load)




(-)
- PCM terminals
- 1 (+) - 26 (-)
- 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
- 63(+) - 26(-)

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

- Vehicle condition
- Idle after warm up (no load)




Fan control signal
- PCM terminals
- 69(+) - 26(-)

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

- Vehicle condition
- Idle after warm up (no load)




Field coil control signal
- PCM terminals
- 36(+) - 26(-)

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

- Vehicle condition
- Idle after warm up (no load)




TP signal
- PCM terminals
- 87(+) - 26(-)

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

- Vehicle condition
- Idle after warm up (no load)

CMP sensor signal




(+)
- PCM terminals
- CMP sensor (left bank): 80 (+) - 26 (-)
- CMP sensor (right bank): 28 (+) - 26 (-)

- 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): 54 (+) - 26 (-)
- CMP sensor (right bank): 2 (+) - 26 (-)

- 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.1:76(+) - 26(-)
- No.2: 50 (+) - 26 (-)
- No.3: 75 (+) - 26 (-)
- No.4: 49 (+) - 26 (-)
- No.5: 74 (+) - 26 (-)
- No.6: 48 (+) - 26 (-)

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

- Vehicle condition
- Idle after warm up (no load)




HO2S signal
- PCM terminals
- Front HO2S (right bank): 18 (+) - 26 (-)
- Front HO2S (left bank): 19 (+) - 26 (-)
- Rear HO2S (right bank): 44 (+) - 26 (-)
- Rear HO2S (left bank): 45 (+) - 26 (-)

- Oscilloscope setting
- 0.5 V/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): 83 (+) - 26 (-)
- Front HO2S heater (left bank): 84 (+) - 26 (-)
- Rear HO2S heater (right bank): 57 (+) - 26 (-)
- Rear HO2S heater (left bank): 58 (+) - 26 (-)

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

- Vehicle condition
- Idle after warm up (no load)