Oscilloscope Patterns and Waveforms

Inspection Using An Oscilloscope (Reference)




Ignition coil control signals
PCM terminals
- No.1 cylinders: 26 (+) - 25 (-)
- No.2 cylinders: 1 (+) - 25 (-)
- No.3 cylinders: 52 (+) - 25 (-)
- No.4 cylinders: 27 (+) - 25 (-)
- No.5 cylinders: 78 (+) - 25 (-)
- No.6 cylinders: 82 (+) - 25 (-)

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
- 18 (+) - 25 (-)

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
- 21 (+) - 25 (-)

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

Vehicle condition
- Idle after warm up (no load)




(-)
PCM terminals
- 22 (+) - 25 (-)

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
- 30 (+) - 25 (-)

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
- 44 (+) - 25 (-)

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
- 53 (+) - 25 (-)

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
- 54 (+) - 25 (-)

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): 58 (+) - 25 (-)
- CMP sensor (right bank): 85 (+) - 25 (-)

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): 59 (+) - 25 (-)
- CMP sensor (right bank): 86 (+) - 25 (-)

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: 82 (+) - 25 (-)
- No.2: 83 (+) - 25 (-)
- No.3: 84 (+) - 25 (-)
- No.4: 85 (+) - 25 (-)

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): 60 (+) - 25 (-)
- Front HO2S (left bank): 87 (+) - 25 (-)
- Rear HO2S (right bank): 35 (+) - 25 (-)
- Rear HO2S (left bank): 61 (+) - 25 (-)

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): 93 (+) - 25 (-)
- Front HO2S heater (left bank): 94 (+) - 25 (-)
- Rear HO2S heater (right bank): 95 (+) - 25 (-)
- Rear HO2S heater (left bank): 96 (+) - 25 (-)

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

Vehicle condition
- Idle after warm up (no load)