Is there way to test vehicle electrical system (module) before replacement?

2016 TOYOTA CELICA
121,333 MILES • 1.4L • 4 CYL • 2WD • AUTOMATIC
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BLESSING EWOBOR
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Good evening, sir,
Hope you are fine sir.
Could there be a way to test vehicle electrical system (module) before replacement?
I am trying to create a platform or garage where electrical components (sensor, module, solenoid) can be tested for functionality before replacement and want is expected signal is expected of them.
What is the basic equipment to use?
Is there any way to test ECU without or within vehicle with basic tools?
How would someone know the exact pins to check for?
Aug 29, 2022 at 3:33 PM
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