Oscilloscope Patterns and Waveforms
Inspection Using An Oscilloscope (Reference)
IGT1, IGT2 control signals
PCM terminals
IGT1 (No.1 and No.4): 1A(+) - 1D(-)
IGT2 (No.2 and No.3): 1B(+) - 1C(-)
Oscilloscope setting
- 4 V/DIV (Y), 0.01 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
Generator output voltage signal
PCM terminals
1AA(+) - 2AC(-)
Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
HO2S (front) signal
PCM terminals
1AB(+) - 2H(-)
Oscilloscope setting
- 0.1 V/DIV (Y), 400 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
Generator field coil control signal
PCM terminals
1AD(+) - 1C(-)
Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
CKP sensor signal
(+)
PCM terminals
- 2D(+) - 2H(-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
(-)
PCM terminals
- 2G(+) - 2H(-)
Oscilloscope setting
- 2 V/DIV (Y), 4 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
VSS signal
PCM terminals
2I(+) - 2AC(-)
Oscilloscope setting
1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
Drive the vehicle with approx. 10 km/h {6.2 mph}
CMP sensor signal
(+)
PCM terminals
2J(+) - 2H(-)
Oscilloscope setting
- 1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
(-)
PCM terminals
- 2M(+) - 2H(-)
Oscilloscope setting
- 1 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
HO2S (front) heater control signal
PCM terminals
4A (+) - 1C(-)
Oscilloscope setting
- 4 V/DIV (Y), 200 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
OCV control signal
PCM terminals
4M (+) - 1C(-)
Oscilloscope setting
- 2 V/DIV (Y), 0.8 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
Purge control signal
PCM terminals
- 4U(+) - 1C(-)
Oscilloscope setting
2 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)
Fuel injection control
PCM terminals
- Fuel Injection No.1: 4Z(+) - 1C(-)
- Fuel Injection No.2: 4W(+) - 1C(-)
- Fuel Injection No.3: 4AD(+) - 1C(-)
- Fuel Injection No.4: 4AA(+) - 1C(-)
Oscilloscope setting
- 4 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up (engine speed approx. 650 rpm, no load, P/S off, A/C off)