Bnr34 Attessa Pressure Switch

[DrR34Gtr]

My bnr34 intermittently goes into rwd when it feels like it, both the alsd and 4wd lights come on, the nissan consult found pressure switch off failure code, all fluids are good and car is in excellent nick, does any1 no were the pressure switch is and if its a replacable part, the factory service manual doesnt identify it and nissan could not find a listing for it, i imagin its somewere in the hydraulic lines near the pump if any1 has had this issue before or knows a fix please help

Any help is greatly appreciated

[jiffo]

The hydraulic unit is mounted on a frame above the diff.

The unit comprises the 12V hydraulic pump, a nitrogen charged accumulator, the pressure switch and the solenoid valve.

All components are mounted on a cast alloy manifold and can be individually removed/replaced. (The accumulator will need specialist knowledge to remove)

There are 2-electrical plugs. One has 2-pins and is the power for the pump. The other has 4-pins?? for the solenoid valve and the pressure switch.

Unsure of your exact fault but it might pay to check the 4-pin plug first to be sure the message from the pressure switch is getting to the pump relay.

These components (apart from the nitrogen accumulator) give excellent service, it's rare to have any fails unless the oil has become contaminated in same way.

[GTRsean]

33 and 34GTRs have the ATTESSA pump setup under the RH rear bumper area behind the rear wheel....it got moved after the 32

[RB 30]

Is your 34 stock? I had this exact same problem, found it was the aftermarket computer sending a dirty signal to the 4wd computer. As soon as it spiked on came the lights.

[DrR34Gtr]

Yea its stock as. Ive exhaused nearly every avenue with no luck, checked voltages across all pins via the fsm, cleaned them with contact cleaner. The problem seems to actualy be the pressure switch itself, but nissan dont sell it seperately and considering the whole unit cost $6000 brand new and second hand is nearly impossible to find im pretty much screwed