Inspection Using An Oscilloscope (Reference)
Cooling fan control
PCM terminals
- 1R(+)-body ground(-)
Oscilloscope setting
- 5 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
APP sensor No. 2 signal
Accelerator pedal released
Accelerator pedal depressed
PCM terminals
- 1X(+)-body ground(-)
Oscilloscope setting
- 2.5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Switch the ignition to ON.
Purge control
PCM terminals
- 1BA(+)-body ground(-)
Oscilloscope setting
- 10 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
A/F sensor heater control
PCM terminals
- 2A(+)-body ground(-)
Oscilloscope setting
- 5 V/DIV (Y), 200 ms/DIV (X), DC range
Vehicle condition
- Idle (immediately after starting the engine)
HO2S heater control
PCM terminals
- 2B(+)-body ground(-)
Oscilloscope setting
- 5 V/DIV (Y), 1 s/DIV (X), DC range
Vehicle condition
- Idle (immediately after starting the engine)
OCV control 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), 5 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
IGT1, IGT2, IGT3, IGT4 control
PCM terminals
- IGT1 (ignition coil No. 1): 2G(+)-body ground(-)
- IGT2 (ignition coil No. 2): 2K(+)-body ground(-)
- IGT3 (ignition coil No. 3): 2L(+)-body ground(-)
- IGT4 (ignition coil No. 4): 2H(+)-body ground(-)
Oscilloscope setting
- 1 V/DIV (Y), 50 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
Generator field coil control
PCM terminals
- 2AA(+)-body ground(-)
Oscilloscope setting
- 0.5 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
Generator output voltage
PCM terminals
- 2AF(+)-body ground(-)
Oscilloscope setting
- 2 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up
Fuel injection (#1, #2, #3, #4) control
PCM terminals
- Fuel Injection No. 1: 2BB(+)-body ground(-)
- Fuel Injection No. 2: 2BC(+)-body ground(-)
- Fuel Injection No. 3: 2BD(+)-body ground(-)
- Fuel Injection No. 4: 2AZ(+)-body ground(-)
Oscilloscope setting
- 10 V/DIV (Y), 25 ms/DIV (X), DC range
Vehicle condition
- Idle after warm up