R32 Hicas Pump Pressure Switch Replacement?

[EJD]

Hi, the Attesa ETS hydraulic unit was leaking oil and I discovered that the pressure switch had a broken cap and leaking internally from it. I tried to replace the sensor alone but Nissan don't have a part number for it, except for the whole unit itself which is 41610-05u00. Can anyone advise on an alternate replacement switch? Thanks!

[Duncan]

no idea about the switch....but I do have spare units for 32 gtr if you want one.

[sneakey pete]

I've just discovered the exact same wonderful issue with my car.
Has anyone had any experience with repairing this issue or is the default answer still to grab a second hand pump assembly?

(or spend $3200 for a brand new one out of Japan)

[scotty nm35]

I have 5 Stagea pump assemblies here with the same issue. If anyone finds a replacement pressure switch let me know.

If we could find the hysteresis curve of the switch I am sure I could source a replacement... Would it matter if the pressure was a little higher or lower?

[sneakey pete]

I guess that depends on what the switch is used for, if it is just a pressure check to make sure the system is up to pressure it shouldn't matter, but if its used in the actual actuation of the transfer case itself its probably rather important.

[scotty nm35]

Just like an air compressor pressure switch, it has a hysteresis engagement, as in it switches on at a preset low pressure, and off again at a higher one, (around 220psi afaik.) This is to keep the Attessa pressure in an approximate pressure range. If it sees anything outside that range it likely throws a code.

The transfer case won't care what maximum pressure is used to engage the clutches, but more pressure would mean the clutches are transferring more power to the front wheels than the attessa computer wants to send. How much this is an issue I don't know.

Anyway, I have found a replacement can be custom made if you don't mind waiting, and can afford 10,000 switches.

[sneakey pete]

provided you can get a new switch can they easily be changed out or are there seal issues?

[scotty nm35]

I think it was a BSPT pipe thread, so a little liquid teflon would seal it nicely.