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Stagea Wgnc34 Ecu Pinout. Once Again.

XPbIM3

By XPbIM3,
in Four Door Family & Wagoneers

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XPbIM3 Rookie

XPbIM3

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Have this famous "1 month" ECU, "23740 0V310" with my rb25det from stagea and going to put into C33 laurel.This ECU have an exclusive pinout, as I've heard. Right?

Does anybody have a info on exact pinout? Google pointed me here on forum.

Thank You!

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https://www.sau.com.au/forums/topic/423944-stagea-wgnc34-ecu-pinout-once-again/
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Duncan Grand Master

Duncan

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Hi mate, I'm sure you saw from the other thread, I am also "lucky" enough to have this ECU.

Are you using the matching loom and ECU, or do you need to play with the loom? If you are using a matched ECU and loom you should not have any issues. If you need to change the wiring or ECU like I did it, it is a problem.

I do not have a pinout for it, the changes we made were 1 by 1 testing. If you do find a full pinout it would be helpful. The workshop manual only covers the first pinout, not this one or the last one before series 2.

XPbIM3 Rookie

XPbIM3

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Yeah I have a loom and ECU.

But lets say that loom is half-cut (

I will trace the injectors, and coils and knock sensors and such stuff on intake side of engine, but MAF wires are cuted away, and there is alot of open connectors on loom, that looks like A/T connectors to me. So the ECU pinout will be usefull to sort things which are crucial to make engine run, and useless wires like A/T or A/C signals.

To start with I've opened a ECU and used a test probe to probe a power and ground pins - they are where thay should be lika on a pic. So far.

pinout1.jpg

In worst case a have a good friend of mine with WGNC34 rb25det running in C33, if he is "lucky" enough, he possibly got the same ECU aswell, but with noncut loom.

XPbIM3 Rookie

XPbIM3

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After tracing several crucial wires: ecu power ,MAF, coils, injectors, so on... no significant differences were figured out so far.

I'll be placing engine in engine bay theese days and try to plug things on. Will post here if anything goes wrong.

  • 3 weeks later...
XPbIM3 Rookie

XPbIM3

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Did the swap, wired all using the R34 manual, everything ok!

- Vid of runinng.

Today wired the cold start valve under mainfold, as i can see - its just powered +12, when car is warm - it dies without throttle.

There is an additional valve near the AAC. Here, the purple one:

post-20406-1142855991.jpg

While the AAC is wired to ECU, the second valve on mainfold and "cold idle" under mainfold are not.

Can anybody point me on any info how those two valves should be wired for proper operation. And what purpose the second valve on mainfold for?

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Not an expert on this but it would seem according to the write up that the purple piece is part of the AAC valve<br /><br />http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/

XPbIM3 Rookie

XPbIM3

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Not an expert on this but it would seem according to the write up that the purple piece is part of the AAC valve<br /><br />http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/

Yeah, thats right, but what exactly it does? Maybe the purple one for compenstaing and indle drop on A/C or something.

Here is the vid with dashboard.

Notice the idle drop just after start. A minutes later it became worse, the idle gone down low, and engine dies without throttle.

Edited by XPbIM3
  • 4 months later...
XPbIM3 Rookie

XPbIM3

Posted
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Giving a conclusion to this thread:

All rb25det ECUs from stagea regardless of their part number have the same pinout. You can find exact pinout in R34 service manual.

However you cannot use early <97' loom on 97+ stagea cars, or even NEO cars, beacuse the loom itself have huge differences in engine-to-chasis loom connection points.

Re-wiring a wire harness to any other RWD nissan is easy but you must trace every wire with care to have everything properly connected.

A blue connector on AAC body is a/c idle drop compensator (FICD)

A brown connector is AAC valve to control idle by ECU.

And the connector under the intake manifold is IACV air regulator, to ensure an easy cold start.

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