Mitsubishi Outlander AC Compressor

The Outlander PHEV has a CAN bus controller AC compressor.

General Remarks on AC Systems

3D Printed Plugs

One thing to note, your old system components will likely need flushing of the old oil as it's damaging to compressor motor wiring lacquer. It can cause shorts. When getting your system refilled, it needs to contain compatible lubricating oil, POE MA68EV is listed in the manual, likely the same as other hybrids/electric cars.

To avoid dirt, debis and moisture entering the AC compressor, you can 3D print some plugs to close off the holes of the AC lines, the files can be accessed on Printables .

First Generation (Part Number 7813A378)

Dimension and 3D Scan

3D Scan of the Outlander 7813A378 Compressor

The 3D scan of the Outlander AC compressor is provided by Tomdb on GrabCAD

Sizes

Weight
Length	22.5cm
Height	24cm (including the HV cable) 21.5cm (excluding the HV cable)
Width	12.5cm (excluding the refrigerant connections)

Bolt Pattern Drawing

The bolt pattern of the AC compressor is shown in the drawing on the left. A high resolution drawing as well as some models to aid the design of a custom bracket are available on Printables.

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Second Generation (Part Number 7813B097)

Dimension and 3D Scan

Currently no 3D scan of the newer style AC compressor is available yet.

Sizes

Weight	6.2kg
Length	19cm
Height	20cm
Width	12cm

• Dimension of the Model Year 2018 Outlander AC Compressor
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Connections

Refrigerant Connections

The part numbers for the Mitsubishi hoses are AMD45418, AMD46168. Unconfirmed, but thought that these fit https://www.evcreate.nl/shop/airconditioning/adapter-set-airconditioning-compressor/ The correct fitments on Aliexpress

Outlander compressor hose connections

https://www.aliexpress.com/item/1005001688953296.html R134 4 curved and R134 5 curved was what I ordered, so 11.5mm and 14mm.

Low Voltage Connection

The mating connector is Sumitomo 6189-0126 https://www.auto-click.co.uk/6189-0126?search=90980-10942 and the pinout is the same as the water heater. Connector also available cheap on aliexpress.

1 - 12v, 2 - GND, 3 - CAN H, 4 - CAN L

High Voltage Connection

The compressor is connected with a 40amp fuse to high voltage. Older models don't have the HV socket as shown above, but have the wire attached. Polarity is the same as the heater.

Newer models have a socket. [Place holder for part number]

HV connector. Left is negative, right positive.

AC compressor driver board.

Controlling the Compressor

Control Messages

0x185 controls the compressor and 0x285 is also required for operation, much like other outlander components. It broadcasts a few ids, 0x388 seems to be useful and contains it's status.

0x185 - Control Message

The first byte, byte 0 controls the state of the compressor 0x08 is standby and 0x0B is start command

The second byte, data[1] doesn't seem to have a function.

The third byte is unknown but 0x1D works.

The forth and fifth also seem to not do anything.

Sixth byte is RPM control, 0x08 is inactive, 0x09 to 0x54

Seventh is also unknown, 0x00 works

Eighth is also unknown either 0x00 or 0x03 work

0x388 - Status Message

First byte, 0x01 is HV present. 0x02 is No HV present, 0x7C is startup/running.

Third and Fourth bytes seem to be RPM feedback.

Eighth byte status 0x00 is no CAN, 0x01 CAN error, 0x02 is 0x285 receive error and 0x03 other error

Example control code

void sendCANframeE() { //AC compressor
       outframe.id = 0x185;            // 0x185 0B 00 1D 00 00 08 00 03 
        outframe.length = 8;            // Data payload 8 bytes
        outframe.extended = 0;          // Extended addresses - 0=11-bit 1=29bit
        outframe.rtr=1;                 //No request 
        if(digitalRead(AC_pin) == LOW) { //AC pin is active        
        outframe.data.bytes[0]=0x0B; // status command 08 stbd, 0B start
        }   
        else {
        outframe.data.bytes[0]=0x08; //if we sense LOW we go to standby
        }              
        outframe.data.bytes[1]=0x00; // 
        outframe.data.bytes[2]=0x1D; // 1D works
        outframe.data.bytes[3]=0x00; //
        outframe.data.bytes[4]=0x00; //
        if(digitalRead(AC_pin) == LOW) { // AC is active
        if (ACrpm <= 3800) { // Power for spinup 
        outframe.data.bytes[5]=0x25; // RPM command 08 to 54
        }
        else if ((ACrpm > 3500) && (ACrpm <= 4200)) { // power is reduced 
        outframe.data.bytes[5]=0x20; // RPM command 08 to 54        
        } 
        }
        else {
        outframe.data.bytes[5]=0x08; //AC pin is inactive
        }        
        outframe.data.bytes[6]=0x00;
        outframe.data.bytes[7]=0x03; // can be 00 or 03, it does not differentiate
       if(debug) {printFrame(&outframe,1);} //If the debug variable is set, show our transmitted frame             
       if(myVars.CANport==0) Can0.sendFrame(outframe);    //Mail it
         else Can1.sendFrame(outframe);

This thread contains more detail information and is recommended reading: https://openinverter.org/forum/viewtopic.php?t=1997&start=25