4Wd Light On

[liammph-uk]

Just had the car remapped (drives so much better now) but the 4wd light has come on and we can't work out why. As far as I know the 4wd is controlled by a separate ecu, at least it is in the Skyline, so I was presuming it's still the case in the Stagea? This is on a series 1 rs4 that's had a manual gearbox conversion. Not had a problem with the 4wd system before, any help would be appreciated.

[scotty nm35]

What ecu, stock with a reflash? Are you sure it was the correct image for your model? Have you mucked around with the throttle position sensor?

Perhaps is was just coincidence, but I doubt it.

[liammph-uk]

No gone for the Link G4 ecu.Don't think anything that was done would have affected the throttle position sensor, how would that affect the 4wd?

Yeah could be coincidence, but the light came on as soon as the new ecu was plugged in.

[liammph-uk]

Trying to find the 4wd ecu so I can look for fault codes, anyone know where it is?

[MikeH]

I have the same problem. Well sort of anyway.

My 4wd light comes on probably 8/10 times I drive the car. Sometimes straight away, some times not at all... I have the rs4s with a 'mines' ecu.

I am putting a new set of wheels on this Friday and getting a wheel alignment so if that doesn't fix it (doubt it will) then further investigation is needed.

I am keen to see if there is known problems that cause this as well.

[scotty nm35]

Wish I could help you Liam but the UK is just too far for me to travel with my laptop.

Mike, if you need the codes read, I have a Nissan consult 3 here...

[liammph-uk]

Haha thanks anyway Scott. There just doesn't seem to be anything in English which ways where the 4wd ecu is. Going to have to strip the boot out at the weekend to find it I think.

[mely1200]

Hey mate,

Was it tuned on a 2wd dyno? Might have clutch pack problem if you did...

Can you jack it up so all 4 wheels are off the ground? If you can, spin the rear wheels. If the front wheels turn as you do, you still have pressure in the ATTESA system. If not, you might be in strife. Best case, the clutches took a beating but are ok and you just need to get some more fluid in the system, check the reservoir in the drivers side rear.

I have the R33, R34 GTR service manual if you can get access to a consult box; it will tell you whats going on...

good luck, pm me if you need anything.

m

[liammph-uk]

It was tuned on the road rather than on a dyno. Located the 4wd ecu (rear passengerside) and got fault code 75-tps fault. Looks like it needs an output from the ecu, tuner is looking into it.

[scotty nm35]

Seems I was correct.

As far as I know that is the only signal the Attessa needs from the ecu. The rest is done by the G sensor in the centre console.

[Abe2]

was this sortred im having the same issue when

installed a haltech

[liammph-uk]

Engine ecu needs to send an tps voltage to the 4wd ecu to allow 4wd to work. Mines being sorted on the map.

[Abe2]

can someone please tell me what wire is the tps output is to the 4wd ecu as i cant find it PLEASE HELP
i am running a haltech ecu in a rs4s

or can anyone confirm that pin out number 79 is the factroy pin for tps to 4wd ecu

[XKLABA]

Ayvon, if your car is the R33 GTR, it's pin 56

http://www.skyline-owners-club.com/forums/showthread.php?t=22456

Link/ViPec and some other computers "share" the TPS signal from the TPS sensor instead of relying it which inturn lowers the voltage at the various control units, the 34 feels it the most because of the MFD, this is an issue I'm having at the moment and the cure, for me atleast, is a buffer to up the voltages back to correct levels

[Abe2]

ecu is a r34gtt rb25 so its grey plug do we know what pin it is

[XKLABA]

Does the R34 GT-T come in a 4WD version ? If not I'm doubt full it has one in which case you in the same boat as me having to "share" the TPS signal

What car is this in ? And why does it have a GT-T ECU ?

[Abe2]

stagea rs4s s2 run the 25neo
i have replaced factory ecu now im having intermittent 4wd issues im trying to figure out what pinout / wire was suplying the 4wd ecu with tps signal
at this point i was going to t it off straight from tps

[XKLABA]

yeah do that, that is how mine is but I have to run the MFD as well and my lights haven't come on yet, but early days for me and my setup

[Abe2]

when we say mfd? what are we talking about i have failed to fix this still and am slowly losing my mind

[XKLABA]

MFD, Multi Function Display, R34 GTR

where are located ?, I have a guy making me a voltage chaser, basically it takes a high imp input and puts out a low imp out put so it can supply the right signal voltage for more things to use, on mine I'm going to cut it in to the wire leaving the ecu, he made me a PWM switching unit for my fuel pump and it works perfectly