I was looking at the periphery bits and comparing my new V7 96530706 to my older 94170008 and 94170015 roms. I found the following differences and I cannot determine why they would be different. Any other differences I understand. The list below just has be stumped.

94170008/015 .....96530706
F9A bit 1=1...............F9A bit 1=0
bit 2=0 ............................bit 2=1

FDA bit 9=1 ..............FDA bit 9=0
bit 4=0 ............................bit 4=1

FEA bit 13=1 ............FEA bit 13=0
bit 12=1 ..........................bit 12=0
bit 11=1 ..........................bit 11=0
bit 9=1 ............................bit 9=0
bit 7=0 ............................bit 7=1

Can someone please explain why these bits would be different????

Thanks.

Paul

 

30+ veiws and no one has any information ? ? C'mon people, I know someone has to know a little about why there are these differences.

 

As I mentioned in the other thread, you can almost totally ignore FEA on 9653 variants; except for bit 4, nothing there is used. A quick check of 94170015 shows that FEA is used more extensively there; a very quick check shows bits 15, 14, 11, 7, 5, 4, and 2 appear to be in use. I show bits 9 through 15 set to 1 by default on the stock 94170015 I use here for disassembly.

Also, the version of 9653 I use for disassembly (original 96530006, not a modified edition) has FEA set to 0; no bits set. Not sure why you're seeing bit seven set by default.

I'll see if I can find a few minutes to compare the other peripheries under the hood. I have a feeling we have a lot of people tweaking bits that were found against 88590015, but that don't do anything (or do something different in a subtle way) on a VIII ROM.

 

Thanks Logic. I would hate to be changing a bit that could affect other areas.

 

I was looking at at stock maps when I found these differences.

 

http://evoecu.logic.net/wiki/Periphery_Configuration

Quite a few of those are listed there. Your new rom is EDM, so it does not have much of the code that runs under those enabled bits.

 

Actually, only a few of the FEA bits were labeled there. Those are the same definitions in v7 so I know the titles....but I don't know what they actually control.

 

wiki is very helpful for editing the perifery bits.. got my egr deleted with no cel

 

9653 has always been different from the other ROMs. Why we use it on 2G ECU swaps to get rid of the cam/crank sensor codes.

 

I'm having a strange, semi related issue. I have an 03 and I'm running the 96530006 ROM, Tephra 5.1, and I constantly (every time I start the car) get a P0090 FPR CEL. Oddly enough, I don't get the CEL with my 94170015 ROM.

I noticed the same Tephra v7 FEA bit 7 discrepancy, since its the bit that throws the P0090. I have a stock FPR, stock injectors, and an AMS fuel rail. I can't find any leaks or other reasons the car would throw the P0090 only on the 0006 ROM, especially since logic says the FEA bits are ignored on the 9653 variants.

 

Has anyone looked any further into these ? ?

 

Very interesting. I'll have to give it a look