Ok, so I went to have my ac recharged and as I suspected my compressor wasnt coming on. They did some testing and said that my ECU was not sending power to the AC. They connected a wire from the fuse to the battery and the compressor came on. They wanted to install a new switch to fix the issue.

I wanted to know if this makes sense and is common of ecu's. And whether it is a sign of my ecu about to go or something. I ripped out all the excess stereo wiring the previous owner left in to see if that was the issue, but none of that worked.

Can anyone clarify things for me. I didnt see why we had to add a new switch as opposed to rewiring the control or something.

Any advice would be great.

Thx

 

If you check the VFAQ site, the ECU pinout they have to 2G turbos show that pin 22 goes to the A/C clutch relay. Now all you have to do is check for a signal output from pin 22 and if you have a signal from it, then find the clutch relay and replace it.

 

Yea, thats what I planned on doing. I noticed the guy never tested the ecu though he said he did.

Thanks for the info on vfaq.

 

Ok, I went to test my ECU. I am pissed coz I am not getting anything from pin 22. What I wanted to know is if I am testing the right pin. I did not pull out the ECU so I am wondering if the side facing the radio is the bottom of the ECU? Is that right?

I tested the ECU with the car on and even with the AC running. Odd thing is I didn't get anything from it. In fact, pins 20 and 21 didn't give me anything either. Pin 23 gave me something ( i kn ow it is not cooling related).

So if I tested the right pin, does this mean my ecu is f'd up?

Thanks

 

If you tested the right pin and have no voltage going to the a/c clutch you should also check the inputs to the pcm that comand that a/c clutch on. What swich did they want you to replace, the a/c pressure switch? B/c if that isnt working right it wont power upthe a/c clutch.

 

Ok, but I am not sure what pin to check on the pcm. (if I am not mistaken, the pcm is the smaller box by the gas pedal right?)

They wanted to add a new switch to cut off the compressor. This was becoz they wanted to rewire the power to the compressor and then add a switch to turn the compressor off. So basically the switch/control on my dash would be useless.

Can I just run a damn wire from the fuse to the damn battery?

Thx