Lots of Electronics 202503

[Kaz-kzukNA1]

Started servicing another NSX and focusing on the Health Check as there are few things I want to check first before taking the Eng/gbox out of the bay.

Strange wire coming out of O2 sensor ext cable, a/c refrigerant leakage that the specialist couldn't find from where, intermittent [BRAKE LAMP] warning but confirmed it was the actual lightbulb but which one, etc, etc.
Will post in another thread.


As reported earlier, in parallel, working on lots of electronics components from one NSX.

Although being told I can take time, some of the components are required for running the engine or driving.
Aiming to finish all of them soon.





FCU (Fan Control Unit)

Normally, I would just re-solder it if I can confirm that it was at least operating fine before the removal.

However, I don't know enough of the background of this FCU.

Also, there are few different failure modes that can damage part of the components on this circuit board.

Thus, going to use my NSX for testing purpose later.





As seen on many original FCU, lots of hairline crack at many joints.

This photo is just showing one part of the board but there are more at different area.

In this photo, at least 6 cracks can be seen.

Regardless of craking or not, just re-solder every single joints.

Quite a lot so takes time.






Quick dash of coating.





Time for testing.

I have the mockup resistor for rad fan operation check but in order to test the a/c condenser fan, using the actual car.

After driving my NSX with my own FCU for a while, the rad fan kicked in so parked the car and swapped the FCU without running the engine.

IGSW P2 On and the rad fan operated fine so at least I have confidence in driving my NSX with this FCU.

A/C checked fine as the FCU responded properly with the CCU request of A/C On and Off.

Parked overnight to cool everything down and confirmed that the rad fan and the R&L condenser fans stayed Off when they should.





Kept driving with the owner's FCU for 32 miles over the next few days.

No abnormal rad fan operation and the A/C worked fine in cold early morning to mild afternoon weather.

Quick mockup resistor testing for rad fan Hi mode and a/c condenser fan + compressor Off situation.

Though, hope the engine would never experience such extreme heat.

Happy with the result and done.


By the way, quite impressed how well some of the trims inside the cabin is acting as sound deadening.

Removing just the upper trim behind the seat makes huge difference over the noise/sound getting inside the cabin from the point you start the engine to while driving.

No wonder why I can't hear the passenger above 2,000rpm when in Type-R with the single partition glass.