AE111 A/C Clutch Signal

[BZR4AGE]

Hi guys, need some help urgently

Anyone know if the A/C clutch is engaged by the ECU on the AE111? or is it from somewhere else?

I am trying to fix my idle issue when I turn my AC on. I am using Link G4 Storm. Got the digital input sorted, just need to find out what triggers the AC clutch.

THanks

[sergei]

A/C clutch is triggered by A/C ECU (separate unit), from memory it is located either under the heater, or near the cabin fan.

[BZR4AGE]

THANK YOU sergei!!!!! I will search for it right now...this thing is driving me nuts, I've been working on it for the whole day

[matt dunn]

BUT,


most modern ECU's have the a/c feed thru the ECU, and in and an out,
so the ecu can compensate for idle speed before it engages the A/C clutch.

I presume AE111 would be modern enough to do that?

Are the pins labelled inside the factory ECU on the AE111?

[BZR4AGE]

Hi Matt

I've tried all ECU pin, there are 2 AC terminal, but that simply tells the ECU the AC is on. I figured that out..

But can't figure out where it outputs to tell the AC clutch to trigger

[matt dunn]

Hi Matt

I've tried all ECU pin, there are 2 AC terminal, but that simply tells the ECU the AC is on. I figured that out..

But can't figure out where it outputs to tell the AC clutch to trigger

What are they labelled as there should only be one in and one out?

[Rick]

Got a email address? I have the wiring diagram that will clear things up.

[matt dunn]

forward it to me too if you dont mind

rachmat@xtra.co.nz

[BZR4AGE]

danielkhfung@hotmail.com

CHEERS!

[BZR4AGE]

Still struggling....

Basically, for Link I need a Digital Input and Aux Out.

Digital Input tells the ECU the AC is on. This is sorted, I've just wired it to the AC switch on the centre console.

Now Aux Out I cannot sort out. This need to connect to AC clutch. From the wiring diagram, AC1 is the one that links to the AC clutch. I've tried all sorts of settings, High/Low Polarity, High/ Low driver. Nothing works. Have also checked ACT, this also dosen't work....

Anyone have any idea? or have I done it completely wrong?

[matt dunn]

I think you have completly no idea.


You cannot wire a switch on the dash to the ecu and then the ecu switch the compressor relay.

There is way more to the system than that.

If you do it that way, the compressor will run till it freeze's solid and breaks.

You need the a/c amplifer and all the associated wirng with it, pressure control, temperature control, sunlight sensor, outside air temp, evaporator temp, etc, and it is probably rpm controlled in the a/c amp too.

did the car have climate control or just a/c,
and does it still have all the original a/c wiring in it?

[ChaosAD]

blacktop ecu pinout http://www.club4ag.com/faq_and_tech_pages/ECU%20Japan%204age_20v_Black.htm


and a page from the silvertop wiring diagram


looks like ac1 will be an ecu input and I suppose act must be the output

I believe the a/c amplifies sends a signal to the ecu when it wants to run the compressor, the ecu then checks certain conditions are met and compensates for the a/c load then sends a signal back to the a/c amplifier to allow it to bring in the a/c compressor

[BZR4AGE]

For Digital Input - in LINK is called Air Con Request.
For Pullup Resistor - should it be OFF or ON?
For On Levin - should it be High (i.e. 12V) or Low (i.e. 0V)?

For Aux Out - in LINK is called AirCon Clutch.
For Driver Type - should it be Low Side or High? Low Side Driver = a transistor join the aux output to ground, High = join to power supply.
For Polarity - should it be Low or High?

Polarity sets an Aut output on voltage voltage level. Low = output will drive pin to ground when Aux output is ON, High = aux output will drive its pin to ground when the aut is off.

Just want to confirm I've got the settings correct.

Thanks heaps

[ChaosAD]

silvertop diagram shows a 12v pullup resistor

[BZR4AGE]

alright. reading more about the LINK manaul. The AUX out must only switch a relay, and not the load itself.

[ChaosAD]

Yep, the aux out will only sink a small amount of current. If you hook the compressor directly to the ecu you will likely damage components in the ecu, unless it has some sort of protection circuit.

[ChaosAD]

Had a quick look at the blacktop ecu board, act runs through a 300R resistor to a transistor which is switched by the cpu. not sure if the transistor switches gnd, 5v or 12v.
Ac1 goes through a few resistors to a random ic.

[matt dunn]

Had a quick look at the blacktop ecu board, act runs through a 300R resistor to a transistor which is switched by the cpu. not sure if the transistor switches gnd, 5v or 12v.
Ac1 goes through a few resistors to a random ic.

Would tell me ACT is the ouput and AC1 is the input,

which makes more sense as IGT is IGn signal To the igniter,
so ACT would be AirCon To the a/c system,

as in they are both outputs not inputs,

and i would say more than likely that it puts power out the ACT not switches to ground,

[BZR4AGE]

I have basically given up on playing with AC1 and ACT. I've tried every possible settings in PCLINK, nothing works.

With some help from a friend, I've wired it to the relay, and now at least I am a step closer to success.

When AC turns on, it shows as ACTIVE in the status screen for AC Clutch, and AC request. When the AC compressor turns off itself after reaching a certain temp, the AC Clutch and AC request will say inactive. Which is correct I think.

However, I've tried playing around with the settings in the Link (aircon step), it still wouldn't idle up.

Getting really frustrated now, after working on it from 3pm-4am on saturday, and 1pm - 10pm on sunday...is just 2 silly wires! FFS!

Anyway...just releasing steam atm...anyone have any other ideas? surely someone with a AE111 here must have known how to do it, or have they all taken A/C out?