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Mitsubishi Trinary Pressure Switch

tw2005 on Sun January 02, 2011 3:20 AM User is offline

Year: 1994
Make: mitsubishi
Model: galant
Engine Size: 2000
Refrigerant Type: r134a
Country of Origin: Australia

I need help figuring out the correct wiring of my Trinary switch in the receiver drier. It's on a 1994 galant but I expect there's a good chance that the same principles and wiring colours may have been used on other Mitsubishis.

What's happened is that I did not realise this connection had been modified by cutting off the original connector and then reterminating the wires with crimps. Problem is when the wires come out you have no idea where they were instead of having a connector which normally only fit one way.

It has four connectors and the wire colours are green(white trace), green (yellow trace), green, black.

Can someone tell me where each goes?

I can't even work out the pinouts of the switch nor has any search found anything for me.

TRB on Sun January 02, 2011 10:22 AM User is offlineView users profile

Not sure if Alldata or Mitchell would cover a Australian vehicle. But they do have wiring diagrams and a single vehicle subscription can be purchased for a fair price. Have you tried any local parts house for a wiring diagram?


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mk378 on Sun January 02, 2011 3:41 PM User is offline

A switch with 4 big wires mounted on the high side would likely be a combination compressor cutout / condenser fan cut on switch. There are two independent circuits in it with two wires for each circuit.

The cutout circuit is closed when the pressure is normal (between about 50 and 450 psi), which is all the time during standby and normal operation. So if the system sits charged in a reasonably warm ambient, you will find those two terminals have continuity to each other. The wires that control the compressor should be connected there.

That leaves the other two terminals (which will be open with the compressor stopped) being the fan circuit. That circuit closes when the pressure rises above about 200 psi, indicating a need for additional cooling of the condenser.

Next to know which wires in the car perform what function, you'd need a schematic of the car.

Edited: Sun January 02, 2011 at 3:43 PM by mk378

tw2005 on Mon January 03, 2011 5:51 PM User is offline

Ok' thanks

Getting a schematic is the problem. They changed from triple to dual switch on my year model. I can find schematics for the dual with notes about the triple but they don't show the complete circuit for it.

Anyway I'll continuity probe the switch and at least thats part of the equation solved.

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