Inspection Using an Oscilloscope (Reference) Purpose

Inspection Using an Oscilloscope (Reference)




Ne signal
- PCM terminal: 21(+) - 22(-)
- Oscilloscope setting: 2 V/DIV(Y), 2 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




IGT signal
- PCM terminal:
- IGT1: 26(+) - 103(-)
- IGT2: 52(+) - 103(-)

- Oscilloscope setting: 1 V/DIV(Y), 10 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




Input/turbine speed signal
- PCM terminal: 84(+) - 23(-)
- Oscilloscope setting: 0.4 V/DIV(Y), 2.5 ms/ DIV(X), DC range
- Vehicle condition: idle after warm up




Generator output voltage signal
- PCM terminal: 30(+) - 103(-)
- Oscilloscope setting: 2 V/DIV(Y), 5 ms/DIV(X), DC range
- Vehicle condition: idle after warm up

Pressure control solenoid control signal




CTP
- PCM terminal: 81(+) - 103(-)
- Oscilloscope setting: 0.5 V/DIV(Y), 0.1 ms/DIV(X), DC range
- Vehicle condition: ignition key at ON (Engine OFF) and closed throttle position




WOT
- PCM terminal: 81(+) - 103(-)
- Oscilloscope setting: 0.5 V/DIV(Y), 0.1 ms/DIV(X), DC range
- Vehicle condition: ignition key at ON (Engine OFF) and wide open throttle




Engine speed signal
- PCM terminal: 48(+) - 103(-)
- Oscilloscope setting: 2 V/DIV(Y), 20 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




Generator field coil control signal
- PCM terminal: 53(+) - 103(-)
- Oscilloscope setting: 0.2 V/DIV(Y), 2 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




Vehicle speed signal
- PCM terminal: 58(+) - 103(-)
- Oscilloscope setting: 1 V/DIV(Y), 2.5 ms/DIV(X), DC range
- Vehicle condition: drive the vehicle with 32 km/h [20 mph]




Purge control signal
- PCM terminal: 67(+) - 103(-)
- Oscilloscope setting: 4 V/DIV(Y), 20 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




Fuel Injection signal
- PCM terminal
- No.1:75(+) - 103(-)
- No.2:101(+) - 103(-)
- No.3:74(+) - 103(-)
- No.4:100(+) - 103(-)

- Oscilloscope setting: 2 V/DIV(Y), 5 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




Shift solenoid A control
- PCM terminal: 82(+) - 103(-)
- Oscilloscope setting: 5 V/DIV(Y), 5 ms/DIV(X), DC range
- Vehicle condition: drive in the 4th gear




IAC signal
- PCM terminal: 83(+) - 103(-)
- Oscilloscope setting: 2 V/DIV(Y), 0.5 ms/DIV(X), DC range
- Vehicle condition: idle after warm up




SGC signal
- PCM terminal: 85(+) - 86(-)
- Oscilloscope setting: 1 V/DIV(Y), 10 ms/DIV(X), AC range
- Vehicle condition: idle after warm up




Shift solenoid B control signal
- PCM terminal: 99(+) - 103(-)
- Oscilloscope setting: 5 V/DIV(Y), 5 ms/DIV(X), DC range
- Vehicle condition: Drive in D range, 1st gear




Shift solenoid C control signal
- PCM terminal: 102(+) - 103(-)
- Oscilloscope setting: 5 V/DIV(Y), 5 ms/DIV(X), DC range
- Vehicle condition: Drive in 1st or 2nd gear

INSPECTION USING AN OSCILLOSCOPE (REFERENCE)




Purpose
Using an oscilloscope, an inspection such as a stuck solenoid valve is made possible without actually removing parts.




When Normal
Counter electromotive voltage A, generated when the three-way solenoid valve or the fuel injector is turned off from on, shows irregular convergence because induced electromotive voltage B, generated by the plunger return operation, is added to it.




When Plunger Stuck
When the plunger is stuck, pulse convergence is smooth because no induced electromotive voltage B is generated.