2Wd Ecu In 4Wd Stagea

[DaveB]

Hi all,

I can't get my consult interface to work and I suspect a dud ECU consult interface. It's a S2 RSFour. I have checked it has 12V ignition connection and a good earth, and RX & TX wire continuity from the pins on my consult interface to the pins on the board. I have tried two different consult interfaces which work in other cars. So it must be the ECU - argh.

I only have a 2WD ECU to swap in and test (both cars are auto though, and S2). Is anybody familiar enough with the ECU pinouts to know whether a 2WD ECU can be safely connected to a AWD ECU?

I suspect it will be OK, because from a quick inspection it appears as though the only connection to the ATTESA system appears to be "integrated control signal (multiple communication)" which sounds like data to me - hopefully disconnected in the 2WD ECU?

I have been going by a R34 ECU pinout. I don't know if it's different for stagea.

Anybody know if it will be safe to test the 2WD ECU in the 4WD car?

cheers

DaveB

[KiwiRS4T]

Can't see a problem Dave but I'll go to my (Japanese) workshop manual and see if there is any difference.

[DaveB]

Thanks Bob

[KiwiRS4T]

Should be fine Dave. Main differences are between manual and auto but in the Stagea there appears to be no difference between 2wd and awd. The only thing is traction control so depends where you got your 2wd ecu. It should definitely be perfectly safe to plug in and try.

[DaveB]

Awesome, thanks Bob. Just tried it, I didn't start the car, but with ignition on the consult port worked. So looks like my issue is with my ECU.

For reference, car was a 99 RS auto (2WD).

[DaveB]

Well, tried everything, consult interface in the ECU is dead. It's unusual apparently. So I am now looking for a 4WD auto ECU from 99-2001.

[KiwiRS4T]

Give the 2wd one a go. There would be more GTT ecus around than Stageas.

[DaveB]

Yeah, there are certainly more 2WD ones around for some reason. But I need a 4WD ECU to work with my 4WD tune file (also the car is 4WD of course). I might try a couple of overseas importers.

[KiwiRS4T]

So far as I can tell the engine ecu doesn't control the Atessa - there is a separate ecu in the boot for that. It just does the engine and the auto.

[DaveB]

Yes, I wonder about that too. The R33 ECU definitely does - it's pin #56:

On the R34 system(s), I suspect it's pin 79 "ECM TCM, TCS/ABS integrated control signal [multiple communication]", which sounds like a data line. Matt from Nistune also told me there was programming in the ECU which was different for auto and 4WD. But that was a long time ago, with an older version of the type 4 boards.

[Greanmachine UK]

Is it helps you can use a 33GTR attessa ECU in a series 1 stagea. You do need a couple of changes to the pin outs but once worked out it wasnt difficult to do

[DaveB]

Cheers, that's an interesting one. Car is a series 2 in this case. I managed to find another ECU, now just need to install my Nistune board.