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Why not just check it in the car? (I’m sure it’s possible to use a wiring diagram and some wire/ junk yard connectors to do what you have in mind, but why bother?) Also note that a lot of vehicles have the ecu control the alternator output, so keep an eye on that.
They do make test stands and IIRC some of the people that do custom calibrations also use emulators for simulation. Both are well out of the reach of a DIYer. Like Rick and TRcustoms said, doing it on his vehicle (or a similar vehicle) is your best bet.
Quoted From Rick:
Why not just check it in the car? (I’m sure it’s possible to use a wiring diagram and some wire/ junk yard connectors to do what you have in mind, but why bother?) Also note that a lot of vehicles have the ecu control the alternator output, so keep an eye on that.
+1 for the newer vehicles.
I think for that year, that Honda’s alternator will probably be internally regulated still.
Im sure another Honda guru or Eric can let us know for sure C8-)
It’s not likely the ECU is bad I would just plug it in and see what happens. You really can’t mess with Honda ECU’s without changing the hardware and the only way I would know of checking one is to send it out to someone with the proper equipment as even at the dealer we didn’t have such equipment.
You can bench test any ECU but You normally need to be specific on the testing though.
An ECU performs so many functions and there are many internal drivers that can fail but the unit will still power on. To perform that many series of tests would take many hours, special knowledge and many special tools.
As far as a general health check on the ECU? Most scan tools will do an all dtcs detection which would aid in the discovery of a failed sector but the ECU must be hooked up to the vehicle.
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