OK, well let me know when you need help with testing, my car sits all the time, weekend grocery getter so I don't mind testing when I can...

 

tephra,

I was thinking about ways to switch maps, since you are going to now use the throttle for v7, I think, in lieu of the valet.

What about using the aircon switch (came to my mind from the aircon thread just posted recently). The aircon is something that is universal to all ECUs and definitely used as an input to the ECU, so I would think if it is possible to use, it may be worthwhile?

Can something be coded like: activate aircon switch x number of times within y number of seconds? For example, turn aircon on/off 3 times in 2 seconds or something like that?

 

Hi Eric,

I have thought of the A/C switch b4.

Unfortunately I dont think the switch is wired into the ECU.

I think:
1) the compressor on/off signal is wired in as an INPUT
2) the compressor override is wired in as an OUTPUT

Know what I mean?

 

According to RRE and MLR, either pin 8 (A/C relay) or pin 24 (A/C control unit) ought to do the trick on an Evo VIII, no? (Pin 32 appears to be the fan relay.)

For the non-USDM models and the IX, it looks like pins 20, 30, 31, and 65 are involved?

(Ah, I see what you mean, you might be right about the switch itself not being wired in. Shame.)

 

From the RRE pinout diagram, it says AC switch is pin 45. I'll look through the service manual to see if I can see anything.

I'm not sure if I follow you exactly, tephra, but I'm not that good with the ECU inputs, etc. I just figured since some tables are based on AC on/off that the AC was an input that the ECU uses (example, idle tables).

 

ok you have climate control yes?

so the compressor clicks on and off all the time.

I think the ECU can see when the compressor is ON/OFF which is DIFFERENT to when the switch is ON/OFF.

I think you will find MUT9A logs when the compressor is on/off (as well as other bits) try logging it and turn the A/C - then wait for the A/C to turn the compressor of (with the switch still on) and see if MUT9A changes...

 

I see what you're saying.

I just took a quick look at some circuit diagrams and they list the AC switch as an input to the ECU. I'm not sure what they are referring to as the 'AC switch' though.

For example, the inputs to control the fan module are:

1. ac switch
2. coolant temp
3. vehicle speed

So, that 'ac switch' is an input. If that is just the condensor on/off input as you are suggesting, then I agree it won't work. But, if the actual switch is an input, that would be good.

 

Do me a favour -

Log MUT9A.

I think it was MUT9A...

Then try a few different things with the A/C switch/system

 

OK, no problem. I'm going to look through all of the circuit diagrams first to see if I find anything of interest.

 

ok

 

does someone with 90550001 want to check to see if 96530006 works on their ECU as well.

i suspect it will just fine - be good if it does - 1 less ROMID to maintain

 

Thanks.

It turns out the XML was bad in the initial post (back when the thread was first started) it looks like he's fixed it since then.

 

ok next question.

at the moment I have 2 numbers for knockcel -
High Knock Boost Drop time
CEL on Knock flash time

Any objection to making these the "same"?

 

It will work, but not very well, as I tried it in the past when I wanted to see if the 7 ecu would work with launch control.

iirc, 8 and 22 need switching around to get the car to fire up, and then the car doesn't run too well.

Also we would loose the sas control (pops and bangs).

 

ok i'll keep 90550001