R32 Gtr Awd Kicking In When Not Needed

[R.3.2.G.T.R]

found the post

for anyone who has this problem.

I wasnt receiving 8 volts to one of the plugs on the g sensor, white wire on the sensor and pin 23 or 24 out of the ets.

stoked its fixed and thanks for the advice boys

[KiwiRS4T]

My understanding is that the atessa sends 5% drive to the front wheels as a minimum at at all times.

Regarding fluids when my car was auto I bought 20L of quality synthetic atf and used it in the auto, the atessa and the power steering.

[Moodles2]

The R33 and R34 transfer case has the preload at all times, but the R32 doesn't (as far as I know anyway).

[doo doo]

The R33 and R34 transfer case has the preload at all times, but the R32 doesn't (as far as I know anyway).

Correct

[bubba]

The preload isn't in the transfer case itself (i.e. it's not mechanical), the preload is controlled by the ATTESA computer sending pressure to the transfer case.

[Willis]

Well just as abit of of an update with my car, took it to a GTR doctor xD, got all the fluids in the car changed, $600+ of fluids! Both diffs, transfer case, gearbox, ATTESA actuator.. everything done except a coolant flush which is getting done next time i'm there.

My mechanic belives that it is most likely a G sensor. However upon driving he believes that there is something abit wrong with the speedo.. When accelerating it stays on 0kph then quickly rises to say 40kph, the delay is minimal however he belives that this could also cause my issue. As the ATTESA takes inputs from the G sensors, speedo etc right? So if there is a delay, the ATTESSA might be tricked into believeing there is wheelspin.

Any chance of this being the cause? I plan to get it looked at again in the near future!

[bubba]

Well seeing that the 32 ECU gets its' speed reading from the cluster, if the speedo cable/needle is dying (which is what sounds like is happening), then that is quite plausible.

[Moodles2]

I thought the R32 ECU uses the ABS speed sensors for vehicle speed, while the cluster sources it from the gearbox?

[bubba]

Looking at the R32 RB26DETT System Figure, the ECCS unit gets its' vehicle speed signal from the speedo which gets it from the gearbox.

I can't find a diagram for the R32 ABS/ETS unit but I would imagine that the system is only looking at differential readings from the ABS sensors.. will have a look when I get home.

Edited July 28, 2010 by bubba

[doo doo]

Yeah it looks like the ECU gets the vehicle speed from the speedo (for speed limiter etc) but it also looks like the ECU only supplies the ETS (attessa) with throttle signal and engine RPM, I guess the ABS sensors would be providing the speed for the ETS computer. If you end up needing another speedo with speed sensor let me know, i've a spare.

[Willis]

Roger that doo doo!

Is it possible to repair the speedo without changing the cluster.. as i believe my car has genuine k's and would like to keep the "standard" ODO on there if possible.

If it is something as simple as this to fix my problem that would be a massive relief!

[R.3.2.G.T.R]

u may have a worn speedo cable, not hard to change n won't mess with ur cluster

around $100 from nissan

mine used to jump around below 80km and steady afterwards, put a new cable n no more needle flickering

[bubba]

^^ Yeah it will just be the cable or the needle on the end of the cable, I got a new cable from Nissan for not much more than $100 IIRC

[Willis]

This is good news.

BWRGTR.. did you have any problems with your AWD before the replacement?

[R.3.2.G.T.R]

I had pulsing issue where if the car was cruising around 100km, I could feel the car surging forward slightly every 5 secs or so constantly

at the time if didnt put 2 n 2 together as I was only fixing the flicking needle but it also sorted out the surge as well

[Willis]

Hm my issue occurs at 100kph as well, not sure if mine "surges" .. the torque just goes foward after a certain amount of time.

I will have to get this fixed asap and see if it solves my problem:D

[doo doo]

The 'speed warning' unit which looks like a fuse is interchangeable between speedos so you can keep your original cluster. Still don't know if it supplies speed info for ECU or if it's just a limiter warning or power steering/hicas input. If it's jiggered it might be doing something funny to your attessa at 100kph, but check the speedo cable first. After the G sensor of course

[DVS JEZ]

thinking of the speed source for the ETS. it has to be from the wheel speed sensors otherwise it wont be able to sense wheel spin

[Deano 1]

are you 100% sure the tyres are all the same???

do a liltle test, put the tyres on the front on the back and back on the front, than go for a drive and see if it is the same.... if it dose than its a prob with the 4wd system, theres a test you can also do its in the workshop manaul mite be worth alook

[Willis]

i'm not 100%, i will also check up on this. Cheers deano, love your wheels btw ^^, posted a few q's on your thread.