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95 R33 V Spec Attesa problem

nismo-r33
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nismo-r33 Apprentice

nismo-r33

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Hello, I have a BCNR33 and the car is not pulling all 4 wheels. The rear left tire seems to be the only one making power. I checked and my Attesa pump is not coming on and I checked for power to the pump and there isn't any. I checked fuses and I need a wiring diagram of which relays run the system. I replace the relay that's in the trunk (boot) and no change. I also had a leaking pressure switch on the pump so I spliced in another one. If anyone have any ideas of why the pump isn't getting power please share inputs. 20180209_205017.jpg

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KiwiRS4T Grand Master

KiwiRS4T

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If as per your heading you have a V spec then the rear LSD is computer controlled so if its single wheeling you need to fix that first. I believe the V spec attessa control is different as well but don't know much about the V spec. Again you may be able to extract fault codes from the relevant ecus.

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nismo-r33 Apprentice

nismo-r33

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If as per your heading you have a V spec then the rear LSD is computer controlled so if its single wheeling you need to fix that first. I believe the V spec attessa control is different as well but don't know much about the V spec. Again you may be able to extract fault codes from the relevant ecus.
Yes it's different. I don't know if power is even at the ECU. I would like to see a diagram of the system if anyone has it by any chance. Yes the pump and ECU controls the torque split between the wheels. Thanks for the input brother
nismo-r33 Apprentice

nismo-r33

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You need a Consult scan tool or equivalent first.  Codes can tell you a lot.  Not finding the ATTESA computer on the network at all is diagnostic in itself!
True..I might have to run to Nissan which I'm sure they would have one
nismo-r33 Apprentice

nismo-r33

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Problem solved... It was the pressure switch. My buddy and I swapped ECU, Attesa relay, checked each other's fuses, made sure things were getting power and I ground a wire and it came on. So I knew then the system wasn't dead [emoji879]️. So I had a pressure switch that I spliced in from another pump and wallah she came on. The pressure switch is not meant to be separated from the pump but I made it happen.

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