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PostPosted: Mon Jun 30, 2008 7:04 pm 
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Junior WRC

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Location: Knoxville, TN USA
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So I am trying to sort out my AC on the st185 and the problem is, I know very little about ACs. I have upgrade lines for R134.

I had to 205 compressor on the car, but I took it off because I figured it was not compatible.

The magnetic clutch will not engage on the compressor.

Everything in the AC system is from the 185 except the AC idle up valve.

• I was looking at the ECU wiring and the 205 ecu controls the AC idle up valve, and the 185 does not.
So what controls the 185 AC idle valve?

• The 185 ECU has a control for the magnet clutch, but the 205 ecu does not. In its place is a second A/C amplifier.

I have included the AC portion of the ECU guide.

This copy is of the 205 bgb, in red is the 185 component location.

Any insight is appreciated.

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PostPosted: Mon Jun 30, 2008 8:40 pm 
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Junior WRC

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Location: Knoxville, TN USA
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My mr2 friend may have found related info.

http://www.mr2oc.com/showthread.php?t=2 ... n+3+AC+fix

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PostPosted: Tue Jul 01, 2008 8:07 pm 
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Joined: Wed Jul 13, 2005 5:10 pm
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Location: Sunny Fareham, UK
Car Model: ST205
Think the clutch on the compressor is controller via the ECU on the 205 as well?

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PostPosted: Wed Jul 02, 2008 10:18 pm 
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Junior WRC

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Location: Knoxville, TN USA
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There is no pin for it on the ecu. Unless its labeled as something else.

Here is the info I pulled from the MR2 swaps. Those who swap a REV 3 3sgte in their SW20, have to activate the compressor the same way as the NA mr2s.

MR2 info
Quote:
The Air Conditioning (AC A/C):

The symptoms: The AC light turns on on the dash, but doesn't do anything -- the AC magnetic clutch isn't engaging.

The solutions: Aparently the Gen3 runs the AC in a similar manner to the NA as it uses a pink/green wire in IE3 to trigger the AC amplifier as to when it's supposed to turn on the AC compressor. We found this wire present, and the car seemed to be wired on the kick panel for this wire also, but the gen2 harness we removed didn't have this wire. So we cut this wire. We also found that there was supposed to be a tach signal from the ignitor going to the AC amplifier on IE4 pin 10. This was also an empty pin on the wiring harness for the Gen 3 -- so we inserted another pin, and wired it to splice in to the IE1 connector's tach signal to the dash.

The other wires missing on the gen 3 harness appear to be the idle up wiring for the idle up VSV -- but I believe as long as the gen3 ecu is getting the signal that the AC is on (black/white wire) it is controlling the idle up VSV as that appeared to be what was happening.

I hope this helps some people out there with 3rd Gen swaps.



So, they look to the solution that the NA car uses to activate the magnetic clutch on the compressor.
I looked at their info, but started thinking I wonder if the 5sfe on the st18x works the same way. I checked out the ecu pinout for the NA celica and its much like the 205 as far as the AC goes.

Here are the pinout pages from the BGB.
st185: http://img242.imageshack.us/img242/4591 ... b17ph8.jpg

St205: http://www.celicatech.com/imagearchive/ ... EG-122.jpg

5sfe: http://img178.imageshack.us/img178/5624 ... b17fz6.jpg

So I think if I can determine how the 52 celicas activate their magnetic clutch, I can modify my wiring and have a working AC system.

Anyone hav any input?

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PostPosted: Wed Jul 02, 2008 10:53 pm 
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Junior WRC
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185 uses ac amplifier not ecu, if my memory serves me correct.

have you checked operation of the magnetic clutch on the 205 compressor probably an earth issue..

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PostPosted: Wed Jul 30, 2008 11:47 pm 
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Location: Knoxville, TN USA
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We found that if you remove the ACT wire on the bottom of the ecu, the compressor will work. However, the car runs horrible. So I have charged the AC, but I had to replace the ACT wire in the ecu so the car drive normally.

Anyone have an understanding of what information the ACT pin is looking for on the ecu? Maybe I can replicate it like on code 54 and then leave the wire unplugged for the ecu.

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PostPosted: Fri Aug 01, 2008 12:59 pm 
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Location: Sunny Fareham, UK
Car Model: ST205
Can't help yet, but when I do the wiring on my car I'll know more...not helpful I know but at least you know someone else is interested in your problem! :lol:

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95 ST205 - slept for 10 years, now waking up...
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PostPosted: Fri Aug 01, 2008 4:59 pm 
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Thanks. :D

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PostPosted: Fri Oct 03, 2008 7:44 pm 
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Junior WRC

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Ever figure out what signal or data the ECU gets from the ACT pin?

I am thinking I can either trick the ecu or re rought the signal needed to the ecu while removing the amplifier wire from the ecu.

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PostPosted: Mon Mar 09, 2009 7:36 pm 
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BUMP! ;)

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PostPosted: Tue Mar 10, 2009 12:19 am 
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Location: Perth, Western Australia
Car Model: ST205
Spoke to Kris last week and he is planning on getting back into his Four when the weather warms up.....if he can tear himself away from the fishing!

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PostPosted: Fri Jun 26, 2009 10:27 pm 
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Junior WRC

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Location: Knoxville, TN USA
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Is it warm there yet? Its quite hot here.

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PostPosted: Fri Jun 26, 2009 11:02 pm 
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Location: Bournemouth
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I take it you've used the 205 engine loom & ECU and spliced to 185 body loom ?

Not sure if you already have these but manuals are on here:

http://gtfaff.com/downloads/ RM399 page 344 (EWD35) for the 205 aircon.

RM(1990) has diagrams for ST185 page 642 (last page of EWD)


The ST205 compressor has different fittings and I concluded wasn't compatible. If you have retained the 185 compressor then it should be made to work if you can restore the aircon wiring as per 185 loom.

As a thought, I believe there is a pressure sensor which inhibits the clutch if there is no refrigerant to prevent bearing / seal damage.

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PostPosted: Sun Jun 28, 2009 3:59 pm 
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Junior WRC

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Location: Knoxville, TN USA
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Thanks for the reply. You can fit the 205 compressor by switching the heads from the two. I am using the 185 compressor though.

I used the entire 185 harness. The 1992 US model has 95% of the same wiring and PINs as the 205. You only have to switch a few connectors for the rev3 engine and use convert a few other wires to make up for the sensors the 185 did not have.

My issue is if I unplug the ACT wire from the 205 ecu the AC will turn on like normal, but the issue is the car runs poorly. So I need to figure out how to either trick the amplifier or any other methods to get the compressor to kick on without hurting the car's performance.

thanks,
JC

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PostPosted: Sun Jun 28, 2009 6:25 pm 
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Ah, missed the post where you said it was running.

When you say the engine runs badly, is it just an idle issue or does it affect running at higher RPM / throttle ?

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