I swapped 2zz in my corolla ae92. That's why am unbale to figure out how to run AC properly. The compressor does turn on but rpm doesn't increase.What vehicle is this from? The A/C amplifier is internal to the combination meter on the Celica.
Regardless, most likely it is to signal the ECU for A/C mag clutch control as the ECU will control it.
I have the wiring manual of ZZT231 and ZZE123.I'm researching more. Found a few diagrams. But, looks like I need the diagnostics from the Big Book to try & figure it out.
Do you have the A/C amplifier from the ZZE123?
My 2zz is manual. I need guidance and help to figure out AC issue. I have the manuals and ac wiring diagrams. Your email plz, I will send you the manuals and wiring diagrams.I've done some research and am having some difficulties. A lot of variables... like whether the ZZE123 ECU is auto or manual. I haven't even looked into the ae92 amp. I'm also finding that the ZZE123 manual I found is difficult to navigate & not as informative as the Celica's. I have a feeling you will need the ZZE123 ac amp. There really isn't much correlation to the ZZT231. While I like a good challenge, I'm busy lately & it's taking more time than I'd like to spend for free. So, I think I'd rather leave it in the hands of the paid guy.