Need Some Ecu Pin-out Info Please!

[Big Mac]

Evening all,

I've had a look at the pin-out diagrams but I'm struggling! Would anyone know which pin on the RS Four S is the one that transmits the Throttle Position Sensor output to the ATTESA ECU? Basically I've got a Haltech Sprint 500 in the car now but I'm getting a TPS Circuit Error, and I'm buggered if I can work out which wire should be feeding the signal to the 4wd ecu!

Many thanks

Alex

Edited December 1, 2015 by Big Mac

[Duncan]

It's been an error code kind of week have a search for "secret squirrel tweak" it has the details required.

BTW its likely your Air Con relay won't work either, the Stageas appears to trigger it differently to Skylines

[Big Mac]

Yeah I had to manually wire the A/C relay straight to the controls to get that working! Works OK although you don't get the ECU compensating by raising the idle rpm, but I can live with that. I'll have a look for the Secret Squirrel info now, thanks!

[KiwiRS4T]

I didn't install my Link but I believe it was necesary to take a signal directly from the TPS.

ECU pinout attached if it helps

[KiwiRS4T]

I didn't install my Link but I believe it was necesary to take a signal directly from the TPS.

ECU pinout attached if it helps

Pinouts WGC34_Series_1_-_STAGEA_RB25DET_Auto_ECU_ translated.xls

Pinouts R34_ecu.pdf

[Big Mac]

OK, have just had a read of that, now I have more questions lol

1) pin #37 on the original ECU send the TPS voltage to the ATTESA?

2) Does ATTESA require the correct TPS voltage/signal to operate correctly, or is it just a case of giving it the 3.7v as per Secret Squirrel trick? Or does this just fool it into thinking the throttle is part open the whole time?

3) If I just splice the signal from the TPS>ECU to the wire that was on pin #37 on the original ECU, would that then give the correct feed to the ATTESA?

Thanks again, much appreciated!

[KiwiRS4T]

Here is some info from GTRUK - it may (or may not!) help you:

Asim is correct; the Attessa control module does require the RPM signal and an Earth to function properly. However these two items are shared within the factory ECU wiring loom and are not wired exclusively for the Attessa. The RPM signal (pin 7) drives the rev counter and TPS and engine temp sensor share the same earth output (pin 30). Therefore so long as the RPM and Earth is wired correctly to relevant pin location on the ECU they will by default be giving an output to the Attessa unit. The only exception to this rule is the TPS (+ve) signal which is not shared; the ECU takes the input from pin 38 and then feeds an output to the Attessa via pin 56. I’ve attached a copy of the diagram that I found on the net. I used the diagram to create an adaptor harness so that I could keep the factory loom intact and simply Plug n Play with my new ECU.

[Big Mac]

Just a quick update to put this one to bed (and in case anyone has a similar issue!):

On the RS Four S it is indeed pin 37 that relays the TPS signal to the ATTESA ECU.

All sorted on my car now, thanks to all who replied for your help

[zoomzoom]

Pity I didnt see this earlier. I guess its all working now? I went through a bit of a headache getting a standalone going on a s1 stagea.

ATTESA pin -> ECU pin - Description

Pin 3 -> Pin 5 - Tachometer signal

Pin 23 -> Pin 37 - TPS

Pin 34 -> Pin 43 - Sensor ground

[Big Mac]

Yes mate all working like a champ now thanks! Turns out the chap who'd installed the TPS follower circuit had gotten two of the wires the wrong way round so no signal was being received; reversed this and now everything's hunky dory