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  #1  
Old 04-25-2007, 09:30 PM
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Air Conditioning

My SVX air conditioning i.e. climate control, is playing up.

When the system switched to off, is not running and the ignition is switched on, the temperature indicator/control shows "MP", this being the last letters of the normal "TEMP" display. There is also an intermittent beeping signal. Otherwise all appears to perform as normal, including the outside temperature display.

I have never seen this mentioned here and I can find nothing in the manuals which is relevant, including the section covering the self-diagnostic system.

Has anyone else experienced this problem. Advice will be much appreciated.
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Old 04-26-2007, 08:15 AM
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Quote:
Originally Posted by Trevor
My SVX air conditioning i.e. climate control, is playing up.

When the system switched to off, is not running and the ignition is switched on, the temperature indicator/control shows "MP", this being the last letters of the normal "TEMP" display. There is also an intermittent beeping signal. Otherwise all appears to perform as normal, including the outside temperature display.

I have never seen this mentioned here and I can find nothing in the manuals which is relevant, including the section covering the self-diagnostic system.

Has anyone else experienced this problem. Advice will be much appreciated.
Hi Trevor

This sounds like a strange problem to be sure. None of the codes that I know pull up the word TEMP.
The fact that you are only seeing ..MP might indicate the controller has developed a fault.

Have you looked in the How To section Here?

What manuals have you, Owner's or Workshop?

I have the Australian Workshop for a '92, if there is anything you want from that, I will copy it for you.

Joe
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  #3  
Old 04-26-2007, 04:43 PM
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Thanks Joe,

I have the Australian manual just like you, courtesy of James.

There is nothing relevant in the how too, or anywhere else here, which was the reason for my thread.

Curly one for sure. Has anyone had experience with an audible signal in respect of climate control?

Trevor, in need indeed.
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  #4  
Old 04-30-2007, 04:55 PM
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Yes, that does sound a bit dodgy. Have you actually ran the diagnostics? If so what was the result?
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  #5  
Old 04-30-2007, 07:14 PM
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Quote:
Originally Posted by floatingkiwi
Yes, that does sound a bit dodgy. Have you actually ran the diagnostics? If so what was the result?
Thanks for your interest.

No I Have not at this stage, because there is no trouble light indication. There has been a development relating to engine temperature, which is being attended to. After this is fixed, I will be very interested to see if there is any change and will report back here.
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  #6  
Old 05-01-2007, 05:14 AM
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Engine Temp?

That is interesting Trevor.

The ECU does "talk" to the A/C controller all right. Most likely to do with the switching off of the compressor during acceleration.

Six wires feed from the MPFI computer to the aircon system [Fig 35-1]
They are:
Brown & Black
White & Black
Green & White
Brown
Light Green & Black
Yellow and Black

Two of these, the Brown one and the Brown & Black one, connect directly to the Auto A/C control unit. [Fig 48-1]

Did you try querying for outside temperature with ignition on, to see if the full word "TEMP" lights up?

If it does not, it might indicate some diodes are burnt out in the indicator, or it might indicate a fault with the amplifier/controller.

Joe
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  #7  
Old 11-24-2007, 11:41 AM
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Quote:
Originally Posted by Trevor View Post
Thanks for your interest.

No I Have not at this stage, because there is no trouble light indication. There has been a development relating to engine temperature, which is being attended to. After this is fixed, I will be very interested to see if there is any change and will report back here.
Trevor, I would really appreciate if you have made any progress with this problem.

Going back a ways in the threads, there is a note from Paddles to say that in Japan the temperature control often goes haywire, and the only cure is changing to another aircon computer.

Well today on giving my car a run, if find my computer acting up, very similar to how yours gave problems.

Symptoms like this; On switching on, the unit itself will click down the temperature scales till it reaches 18, then stays there. There is a "beep" for every half degree increment. It is almost like somebody had their finger on the blue [temperature down] button, it goes down by itself to the lowest setting.

By coincidence a member in England has a similar problem. In his case the temperature goes up, though.

It is responding to the temp up button, it goes up if you punch it up. However, when you take your finger away it immediately climbs back down to 18 in half degree increments.

Also the problem relates to or affects the outside temp button. When I press it, at times nothing at all happens. No bleep, nothing. At other times it showed the [correct] temperature, but fleetingly. Once or twice it showed outside temp correctly, eg 10 temp, with the 10 blinking 5 times. Most of the time it does not work though.

Did you find out the problem with yours, or did you have to buy another unit?

Thanks

Joe
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  #8  
Old 11-26-2007, 02:34 AM
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Came right while my wife was driving the car. No clue as to why.
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  #9  
Old 11-26-2007, 02:51 AM
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Mine's doing something similar Trevor.

It came good for 5 minutes yesterday, then lapsed back into running down the temps and holding 18.

It seems to be connected to the outside temp sensor. If it works OK, the rest works OK.

I'm wondering if corrosion might be a factor, or a bad earth either on the sensor or inside the unit?

A strange problem for sure. Thanks.

Joe
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  #10  
Old 11-26-2007, 10:20 AM
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Recovering slowly

Aircon worked almost perfectly today. Occasionally the outside temp did not light up when pushed, but 90% of the time it did everything it is supposed to.

As the car's been lying up while I sort insurance, I'm wondering if dampness inside the cabin from condensation and humidity may not be a factor? Would dampness be getting into the computer module, and creating spurious earths for the circuit boards or something?

Anyhow I ran the car for a while to heat up and dry out the cabin, using the aircon. To be honest, it's not particularly damp inside the car, but you can see condensation on the inside of the windows when cold. I just wondered if humid and cold air could be affecting the circuitry?

Joe
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  #11  
Old 11-26-2007, 10:15 PM
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Joe, this is very common for JDM models.

Although it seems to work OK for a while, it will get worse. I am not sure what the exact cause is though.

I ended up replacing my unit with a new one. Subaru in Japan are well aware of the problem and the replacement units have been 'updated' by Zexcel (the maker) to overcome the problem.
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  #12  
Old 11-27-2007, 04:21 AM
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Thanks Paul.

Are you back in Japan?

The funny bit is, this unit in mine is already a second-hand replacement. The last owner replaced it. It worked perfectly in England, nice and cool, did the business.

I'm thinking corrosion or possible dry joints in the circuits. I wonder if anyone has ever opened one up, or if it's easy to open?

Do you happen to know if the outside temp sensor not working properly is a common factor in the Japanese break-downs?

Joe
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  #13  
Old 11-27-2007, 07:15 PM
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Talking

I'm wondering if corrosion might be a factor, or a bad earth either on the sensor or inside the unit?

A strange problem for sure. Thanks.

Joe[/QUOTE]


Hello, Joe. Dunno' for sure, as I have one of those obviously superior US of A
machines, but after my infamous Atlantic Ocean dunking a year ago; & dehumidifying the interior for a week, & still finding SOME moisture beneath a carpet six months later, & having the entire wiring harness re-soldered (front to back), let's say the car has been subjected to the equivolent of a foggy month in olde London towne. Through all this agony, the climate control system has continued to function properly.

Perhaps the Isle's importers chose to include the Lucas Wiring Option to preserve its "stiff upper lip" character.

Best o' luck!!!

Ron.
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  #14  
Old 11-28-2007, 01:18 AM
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Quote:
Originally Posted by Ron Mummert View Post
I'm wondering if corrosion might be a factor, or a bad earth either on the sensor or inside the unit?

A strange problem for sure. Thanks.

Joe

Quote:
Hello, Joe. Dunno' for sure, as I have one of those obviously superior US of A
machines, but after my infamous Atlantic Ocean dunking a year ago; & dehumidifying the interior for a week, & still finding SOME moisture beneath a carpet six months later, & having the entire wiring harness re-soldered (front to back), let's say the car has been subjected to the equivolent of a foggy month in olde London towne. Through all this agony, the climate control system has continued to function properly.

Perhaps the Isle's importers chose to include the Lucas Wiring Option to preserve its "stiff upper lip" character.

Best o' luck!!!

Ron.
Stiff upper lip, you think? So my climate control might respond to a shot of Viagra, then?

I dunno either Ron, long shot.

Strange enough, like Trevor's situation, it improves every day with use. It is working all the time now. That's why I suspect damp and humidity, I think perhaps Japan also suffers from weather. Another possibility is road salt on the ambient [outside] temp sensor. The Brits are buggers too for salt on the roads, English cars rust.

I'll find and clean up the sensor and keep y'all posted.

How've you been? have not seen you post in a while.

Joe
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Last edited by svxistentialist; 11-28-2007 at 09:39 AM.
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