No AC after fw 3.3.1a (?)
 

Hey,

I noticed that my AC does not work, I went to the AC shop today and they said it is an electric problem (no DC to the compressor).
Before I let them dig in, could it be the new fw I use 3.3.1a is responsible ?

Thank you
Elior :party:

Which firmware were you on before that?

pre3.3 beta 13

?

How is your A/C control wired up?

Input 1 OUT to PE1
ALED to 1B, 1G

Worked great on 3.3 beta13

Do you have PE1 set up for your A/C input in the software? Can you post an MSQ?

What do you think ?

What is commanding ALED to turn on?

It used to work on all previous fw I used

https://www.miataturbo.net/attachmen...1&d=1389796496

You need to check your Outport Settings. Im pretty sure you dont have ALED set up correctly.

it is WLED not ALED

https://www.miataturbo.net/attachmen...1&d=1389799665

So you meant WLED here just to be clear?

yes, sorry.

What is being used for PA0? You may want to try switching to something like this

1Q> Input1 IN
Input 1 OUT> PE1
PA0>Relay 1 IN
Relay 1 Out> 1j&4s

Relay 1 Mainboard PA0 ConnectorBoard 1A Radiator Fan

I think I will put stock ecu in just to check if the ac problem is from the new fw or not...

Interesting, in my thread just a few down I am having the same issue on my 00' on 3.3.1. If you figure it out first make sure and post up; likewise, I will let you know what I find.

Not thread jacking, but since we have similar issues (exactly the same but opposite, my AC gets stuck on) I figure we can see what similarities we find. For me, I just found that my AC will not turn on, but once the car hits operating temperature, it is then stuck on. Disabling the PA0 circuit for me turns off the AC compressor; however, once I enable it, the compressor stays on regardless of which way the button is pressed on the dash. Likewise, once the compressor turns on (when PA0 is enabled), going back and disabling PA0 does nothing; the compressor remains on. I also found if I play with the thermoresistor values to lower the perceived CLT temp, I can turn my AC on or off. Because of this, I think it's safe to say we are having an ECU issue.

*edit* I found a solution that seems to work well for me. See the following: https://www.miataturbo.net/megasquir...2/#post1092765

1K > Input1 IN > Input1 OUT > PE1

WLED > 1B&1G

This is how my ac is wired, I did this in order to use the ac idleup in beta13.
Worked great, now on 3.3.1a the ac does not turn on (with stock ecu it does)