YaroRS

Guys, is it possible to fit USDM or EDM evo 9 ECU into Evo 9 GT JDM ?

The reason for this is that I want to run Tephra v7 rom on it, and as I understand it's not possible to run it in Evo JDM ecu.

grayw

The IX PCB's are all the same JE331BA5404A, it's differences in the wiring. Like I said before you will have to try some of the available rom ID's and see which ones work.

YaroRS

Ok, understood, will try then.

donner

iTrader: (1)

Are you 100% sure they are exactly the same even with same PCB number? I have been running my EDM E9 with GT ecu with EDM rom 88840016 (and then also 88580717 tephra v7) and found out that EGR control components were missing from pin 6 what suppose to control EGR, that's why it throws some EGR solenoid related fault code. Other solenoid control outputs like wastegate, fuel pressure, fuel pump and purge were working from right pin with 88580714 rom and JDM GT ecu when tested with evoscan + MUT commands. Of course there still might be some difference in wiring and I'm interested to know what it is.

Older H8 based mitsu ecu's are usually flashwise compatible if PCB number is the same, like in this case of newer GT ecu I can flash EDM rom and run with it. But in older H8 ecus PCB is not really exactly the same even with same number, there can be some small changes like fuel pump is controlled from other pin (= wiring) or then some ecu's controls engine based on MAP rather than MAF and there is some other changes even PCB is with same number. Unfortunately I have not compared my EDM evo 9 and GT ecu to see if these are the same as my original ecu is still installed on car.

As answer for original question, I would just flash 88580714 tephra v7 rom to your existing ecu and try if it works. I have done this with GT ecu and can confirm that atleast EDM evo 9 car runs fine with GT ecu, I just copied FFA bits and immobilizer from original rom. But like I said I got fault code due to missing EGR control in GT ecu but it should be possible to disable whole EGR function from address 103D with ecuflash as you don't most probably even have EGR in your GT (but AUDM or EDM rom expects that there is and throws a fault code).

grayw

100% sure the PCB's are the same on all JDM cars, and it's down to wiring differences.
It's only ever GT's that have caused an issue and don't like running the 88570008 JDM ID. I've used GT ECU's in other JDM models running the SD version of 88570008 and never had any problems with starting or the EGR system.
If you look back at the SD thread, there were issues with USDM cars running the JDM rom on SD, hence the development of so many other rom ID's.

ETA: If you post some pics of the GT PCB you have we can compare them, I have both GT and GSR kicking about.

donner

iTrader: (1)

Is there EGR in any JDM cars (RS, GT, GSR)? If not, it can explain that you have not seen any problems with EGR. Also I had quick look on my 88570008 disasm (I'm not good on that...) and it seems that EGR code is disabled from 103d just like it was found earlier (mrfred?), code itself seems to be there but it is just disabled. Based on this it really seems to be the right way to disable EGR in EDM and USDM rom's

Here is picture of my GT ecu and then link to some random picture presenting USDM IX ecu. From these we can see that even PCB number is the same, ecu is not exactly the same. For example we can see missing transistor and diode from EGR control (on the bottom left side on my front picture, also some other components are missing on the right but don't know what for those are). If I have to guess USDM ecu is the same as EDM ecu but at this moment I can't open my own to check. Like you told, it is possible that all JDM ecu's are the same.





http://www.flickr.com/photos/edward_...ll/4243664618/

grayw

EGR system is present on the JDM cars, attached is a pic of a JDM IX ECU (have both GSR and GT, but are both identical). It's more likely the PCB has been revised rather than a redesign, given the same part number.
As has been already mentioned, there are a lot of differences in the ECU code between the USDM and JDM roms, being the USDM roms contain a lot more code. This maybe why a true universal rom ID has never been found that works on all variants be it either VIII or IX.

donner

iTrader: (1)

Do you know what pin is used to control EGR solenoid in JDM cars? Funny that in 88570008 EGR code was disabled the same way as it can be done in EDM/USDM roms.

grayw

No idea without digging out a wiring diagram. Just as a side note while talking about the EGR system, the VII's suffer P0400 errors when running different rom ID's, so has to be disabled.

YaroRS

guys, need your advice. Tried to run 2 roms on my GT
88580714 (EDM Tephra V7) - got those errors PO403 (EGR solenoid and some other EGR related errors).
88590715 (USDM Tephra V7 + mods) I got EVAP errors (451, 453 + one more error).

Any advice what should I do ?

donner

iTrader: (1)

Exactly same codes I got when used GT ecu in my EDM car with 88580714. In your case, I recommend using 88580714 as there is less trouble codes to be masked away.

You can disable whole EGR function (add this to for example your 88580714 v7 .xml and set value to 0):
After disabling EGR, you still need to set periphery FCA bit 15 to 0. This will disable CEL due to missing EGR solenoid.