tephra, I completely agree with what you are saying about the ECU controlling the compressor. It does and I verified in the circuit diagrams. But there are other inputs into the ECU and one of them shows a switch.

It may not be loggable via Mut9A, but I do think we have one or two inputs from the AC system into the ECU. Let me post the wiring diagrams to show what I am talking about. Someone with better experience can maybe tell us for sure.

I will be flashing John's livemap within the next few days (finally just wired my switch in today to get ready), and I will start logging 64 mut addresses at a time to see if I can see anything else changing with the defrost button or AC settings.

 

hehehe ok I see what you mean, lets look at the wiring diagram...

Ages and ages ago I did that for the demister, loaded up evoscan data.xml with MUT00 thought to MUTA0 or something like that and toggled the demister to see if any bits flipped... didn't see any

 

OK, here are the pages I was looking at. Take a look while I go make something to eat.

 

Just while people are looking at that here is V7test1:

removed due to bugs

IF you intend to test it:
a) post up saying YOU ARE TESTING IT RIGHT NOW
b) TEST IT
c) post up the result

I don't want too many people grabbing it and then it failing.

There is a high chance that this ROM wont even let the car start - but its worth testing anyways

Let me know what you think of the new TephraMod menu in ecuflash.

Let me know of any Q's you have or suggestions

 

Tephra,

Would you care if I add the appropriate patches to the ROM to support OBDII emmissions and Immoblizer for USDM cars coming from 9417 so it's plug in your Immoblizer, fuel, timing, etc.....then go?

~Zach

 

Zach - that's fine and infact welcomed ONCE the final version is out.

Also a load rescale will be in order

 

Does anyone know what the 'dual pressure switch' is that is shown on pg. 90 as an input into the ECU (pin 45) and the A/C ECU?

The only thing that I am wondering about is on pg. 87 where it shows ac switch as one of the inputs into the ECU, on connector C-121, which is the first 26 pin ECU connector. Looking at the wiring diagrams for the ECU, that should be either pin 8 or pin 24. Pin 8 just controls the compressor as tephra mentioned. Pin 24 is an input from the AC ECU. So, the AC ECU may be handling the logic of the ac switch along with the other inputs. Unless there is another pin in that C-121 connector that is being used?

Otherwise, we need to know what that pin 45 switch is.

 

Tephra, a possible suggestion for down the road: now that we can do bit-by-bit tweaking, why not change your options to bitfields? At 16 options so far, two bytes would do it. Just because you've got all that extra ROM space in 96530006, doesn't mean you have to use all of it.

I really like how you're distributing this now (change the ROM ID, just drop the new XML in place and include the existing and potentially modified XML for the original ROM). I suspect this will be much less error-prone, as long as the new ROM ID doesn't confuse people.

If I get a few minutes at lunch tomorrow, I'll give it a try.

 

Re: the dual pressure switch; monitoring of high and low line pressures in the A/C system? Presumably for disabling A/C when pressure is too low (ie. you just killed another few miles of ozone layer because your A/C system leaked)? I know that on both our 1g and WRX, when the lines were empty, the compressor wouldn't engage.

 

Hey Ed,

Yeah I thought of bitfields a long time ago, but there was some reason why I didn't go that option.

I'll rethink it

Yeah ROMID was a good idea, again I thought of it AGES ago, but got rethought after someone bright mentioned it again

cool-cool.

Remember, at the first sign of "weirdness" flash back to your pre 07 rom.

Also can you attach your flashing log when done?

 

Will do; I won't force it if something behaves oddly, and I'll be happy to post up the log.

(I'll end up spending most of my lunch hour just duplicating all the stuff from my old ROM, so we'll see if I have enough time to actually flash it. There has got to be a better way to distribute patches like this...)

 

Yep, makes sense. Looking at the circuit diagram again, it's basically just a range of pressures where the circuit will complete and input into the ECU. Drop below 196kpa and it opens circuit, go above 3138 kpa and it opens circuit.

That takes pin 45 of the ECU out of the equation. That leaves pin 24 as far as I can tell, which is coming from the 'A/C ECU'. I'm guessing that's a conditional based input based on the a/c switch, etc. So maybe there won't be any 'usable' inputs? I wish the page that shows the a/c switch as an input into the ECU gave more details, but I think it is just showing that the a/c switch, coolant temp sensor and vehicle speed are inputs that are used as conditions which ultimately are input into the ECU from the A/C ECU?

 

Tephra,

Do we have to implement load based boost control to use the gear based boost control tables or is it already integrated?

~Zach

 

^ whatever stock is.

so yeah its already loadbased - just not the normal 2byte load we log..

is that what u mean?

 

Yeah I got it switched over to psi based boost control courtesy of mrfred!

I will be testing tomorrow or friday, I got everything switched over tonight, I will post up my results...

~Zach