SUBJECT:

A/C TIMER INOPERABLE WHEN OUTSIDE/
COOLANT TEMPERATURE IS LOW

No:

TSB-24-55-003

DATE:

December 2024

MODEL:

Outlander Plug-in Hybrid

CIRCULATE TO:

[ ] GENERAL MANAGER

[ X ] PARTS MANAGER

[ X ] TECHNICIAN

[ X ] SERVICE ADVISOR

[ X ] SERVICE MANAGER

[ X ] WARRANTY PROCESSOR

[ X ] SALES MANAGER

PURPOSE

The air condition (A/C) timer does not operate when outside temperatures are low even when
the A/C timer has been set with the navigation system or Mitsubishi Connect app.
The heat pump for the A/C system functions along with the blower fan operation. However,
due to inappropriate software in the A/C Auto Amp, the blower fan is not activated when
outside/coolant temperature is low, preventing the heat pump from operating properly.
The countermeasure in this bulletin will:
• Change the control program of the A/C Auto Amp so that the blower fan operates even
with low outside/coolant temperatures.

AFFECTED VEHICLES

All 2023-2024 Outlander Plug-in Hybrid

REPAIR PROCEDURE

Based on customer concern please:
• Follow the steps below to determine the procedure method required
• Refer to the Parts Information section in this bulletin
• Reference TSB-22-55-002REV3 for A/C Amplifier replacement along with the Service
Manual

Copyright 2024, Mitsubishi Motors North America, Inc.
The information contained in this bulletin is subject to change. For the latest version of this document, go to the
Mitsubishi Dealer Link, MEDIC, or the Mitsubishi Service Information website (www.mitsubishitechinfo.com).

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Confirm ECU part number from the ECU information of the A/C Amp (Display on MUT-3SE:
HVAC) by using MUT-3SE.
Using the chart below, follow the appropriate method that corresponds with the confirmed
ECU part number.
Method

ECU part number
27760W018P, 27760W019P, 27760W020P,
27760W027P, 27760W028P, 27760W029P, (A) Reprogramming
27531W020P, 27531W021P

27760W006P, 27760W007P, 27760W008P, (B) Replace part, refer to Service Manual and perform
27531W003P, 27531W004P,
configuration (Display on MUT-3SE: HVAC)
27531W007P, 27531W008P

• For A/C Amplifier replacement procedure, please also reference TSB-22-55-002REV3 in
addition to the Service Manual.
Note: Select the correct ECU part number according to old AMPLIFIER part number and whether
or not seat heating is installed. Location of part number:

Method:
A. Reprogram the control programming of the A/C Auto Amp according to the chart below.
Model

Data No.

New HW
Part No.

New SW Part
No./Ver.

Target HW
Part No.

27531W02.3PN

-

27531W023P

-

27531W02.4PN

-

27531W024P

-

Outlander
PHEV

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Target SW Part
No./Ver.
27760W018P
27760W019P
27760W027P
27760W028P
27531W020P
27760W020P
27760W029P
27531W021P

Remarks
DUAL
A/C
TRIPLE
A/C

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B. Replace the part according to the chart below.
Model
Outlander
PHEV

Part Name

AMPLIFIER,HVAC

Part No.

27760W024P
27760W006P ※1

Quantity

Remarks

1

DUAL A/C
DUAL A/C
with seat heater
TRIPLE A/C

27760W025P

27760W007P ※2

1

27760W026P

27760W008P ※3

1

※1：(ECU part number: 27760W006P/27531W003P/27531W007P)
※2：(ECU part number: 27760W007P/27531W003P/27531W007P)
※3：(ECU part number: 27760W008P/27531W004P/27531W008P)

Note: Select the correct ECU part number according to old A/C auto amp. Part No. and A/C
specifications described in Remarks column.

WORK PROCEDURE
Caution during programming:
 Turn off all electrical devices to minimize the vehicle's electrical load. Also use an
external power source to ensure that the vehicle battery maintains the specified voltage
during programming.
The low voltage of the auxiliary battery may cause the incompletion of programming
and once it happens, ECU must be replaced to brand new one.
 Write down all the customer’s electrical device settings such as A/C and radio before
programming and restore them after programming.
 Connect the MUT3-SE to an AC power source to prevent internal battery discharge.
 Before using, make sure the USB cable and MUT3-SE main harness are not damaged.
 Do not perform maintenance work in the engine room during programming.
The cooling fan may operate while programming.
 Check the All DTC after programming and erase them if any.

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EQUIPMENT
•
•
•
•
•
•
•

The following equipment is needed to reprogram the ECU:
VCI (Vehicle Communication Interface) or VCI Lite - MB991824 or MB992744
MEDIC Laptop/Tablet with A/C power adapter - 520924, or FZG1MK2
MUT III Main Harness "A" (blue connector at the DLC end) - MB991910 or MB992745
USB 2.0 Cable - MB991827 or MB992747
MEDIC 3.5/4 update at 894 or higher
For Standalone MUT III units, MUT3-SE Reprogramming Database SDBN 240301NR or
higher

SOFTWARE/MEDIC VERSION VERIFICATION
1. Verify that the ECU has not already been updated to the latest S/W number in the table
above. If the ENGINE ECU is at the latest level, reprogramming is not necessary.
NOTE: Reprogramming the ENGINE ECU with the latest database (e.g., SDBN 240301NR)
includes all past and current reprogramming for TSBs of affected vehicles. It is not
necessary to reprogram the ECU for each previous TSB.
For MEDIC 3.5/4 users only: (MUT-III SEV users go to step 5)
2. Verify the MEDIC 3.5/4 is at version 3.5 and at update 894 or higher.
If your MEDIC 3.5/4 update is at least 894, continue with the Reprogramming Procedure.
If your MEDIC 3.5/4 update is below 894, update your MEDIC as follows.

3. Select the MEDIC 3.5/4 Admin tab and click on “Updates”.

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4. If the MEDIC update screen advises updates are available, click the “Begin” button. After all
updates are complete, GO TO THE REPROGRAMMING PROCEDURE.

5. STANDALONE MUT-III SE SCAN TOOL VIEWER (STV) ONLY: (MEDIC 3.5 USERS – GO TO THE
REPROGRAMMING PROCEDURE). Verify that your MUT-III SE has the most current version of the
reprogramming database from the MUT-III SE Main Page.
a. Press the MUT-III SE STV button.

b. Push the "car icon" for Chassis No/VIN read out.

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c. Confirm the vehicle information displayed is complete/correct, after selecting the
appropriate class. The class can be found on the B pillar.
Next, press the "ECU reprogramming button".

d. Select "SDB Data List button", verify software information according to the chart in this
bulletin and the SBDN Version number at the top right is N240301NR or higher.
i. If the database number displayed on your MUT-III SE is N240301NR or higher,
continue to the next section.
ii. If the reprogramming database number displayed on your MUT-III SE is lower than
N240301NR, then the MUT-III SE database needs to be updated.
iii. Once the database number is confirmed, hit the Home button to go back to the
System Select screen.

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REPROGRAMMING PROCEDURE
! CAUTION

To ensure that the vehicle battery maintains 12V during the procedure, hook- up a
battery charger to the vehicle during the procedure.

NOTE: VCI Stand−alone reprogramming is not available for this procedure. The laptop/tablet and
the VCI must remain connected for the entire procedure.
1. Connect the equipment as follows:
NOTE: VCI Lite and MEDIC 4.0 Toughpad shown for illustration purposes only.
• Turn the MEDIC PC/tablet on. If the battery
indicator in the lower right hand corner of the
screen does not show a full charge, it is
recommended that either the battery be charged
prior to beginning or be used with the A/C power
adaptor connected.
SE
• Connect the USB cable to the VCI/VCI Lite. When
the laptop/tablet displays the MUT-III SE main
screen, connect the USB cable to the device.
• Connect the MUT-III SE main harness with the
blue DLC connection to the VCI/VCI Lite. Connect
the blue connection of the MUT-III SE main
harness to the vehicle's data link connector.
• For VCI only: Turn the VCI power switch ON. Verify
that the indicator lamp in the upper right corner
Lite
of the screen is green.

! CAUTION

DO NOT DISTURB THE HARNESS CABLES OR CONNECTIONS DURING THE REPROGRAMMING
PROCESS AS IT COULD CAUSE THE CONTROL UNIT TO LOSE DATA. IF THE USB CABLE IS
DISCONNECTED DURING THIS PROCEDURE, A WARNING MESSAGE WILL DISPLAY.
NOTE: Due to limited space it may be easiest to connect battery charger cable onto ground point.

Note: Do not disturb the cable or turn off the ignition during reprogramming to prevent
damage to the ECU.
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2. Turn the ignition switch to the “ON” position.
3. Turn on flashers to prevent vehicle from shutting/powering down.
4. Press the "MUT-III SE STV" button.

a. Push the "car icon" for Chassis No/VIN read out.

b. Confirm the vehicle information displayed is complete/correct, after selecting the
appropriate class. The class can be found on the B pillar. Next, press the "ECU
reprogramming button".

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c. Select "HVAC" and press "OK".

d. Select "Reprogramming (ECU software rewriting)" and press "OK".

e. Verify the correct software is listed (refer to software chart). If correct, "check the
selection box", and press "OK".

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f. Press the "OK" button to begin reprogramming.

g. Login to AS2.

h. A reprogramming progress bar will be displayed.

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i.

HVAC End processing may take up to 15 minutes to complete.

j. When complete, press the "OK" button.

k. Confirm the results of reprogramming and press the "OK" button.

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l. Press the "back arrow" until returned to System Select.

m. Turn the ignition switch to the "OFF" position for 10 seconds. Then turn the ignition switch
back to the “ON” position.
n. Press the "All DTCs" button.

o. Press the "Erase and Read all DTCs" button.

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p. Press the "OK" button.

q. Press the "OK" button again to begin Erase and Read all DTCs.

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r. Press the "OK" button when complete.

7.

Using a ball-point pen, enter the appropriate ECU part number, Software Part

Number

(ROM ID#), this Technical Service Bulletin number, your dealer code, and the
current date on the Engine Compartment/Control Module Label (p/n
MSSF024G00).
The Vendor Code is not applicable. The label is available from your
facing PDC.

8. Test drive the vehicle to confirm proper operation and restore all customer presets if necessary.

WARRANTY
This bulletin is supplied as technical information only and is not an authorization to repair. If an
affected vehicle is reported with the described condition, diagnose the condition, repair as
described in this bulletin and submit a normal warranty claim using the information below.
Operation Code
558515SY
558515SZ

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Operation
Replacement
Reprogramming

Quantity
1
-

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Work Time
1.0H
0.3H

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