Mitsubishi Outlander (2013+). Manual - part 739

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-12

STEP 2. M.U.T.-III other system diagnosis code
Check whether the combination meter-related diag-
nosis code is set.

Q: Is the diagnosis code set?

YES : 

Diagnose the combination meter. Refer to .

NO : 

Go to Step 3

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

• ETACS-ECU

U0155: Combination meter timeout

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the combination meter, and then 

go to Step 6.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the combination meter and the 
heater controller assembly (A/C-ECU) 
(Refer to GROUP 00 

− How to Cope with 

Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the heater controller assembly 

(A/C-ECU), and then go to Step 6. 

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the combination meter and the 
A/C-ECU (Refer to GROUP 00 

− How to 

Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No. U0168: KOS CAN time-out

CAUTION

If diagnosis code No.U0168 is set in the A/C-ECU, 
diagnose the CAN main bus line.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

The heater controller assembly (A/C-ECU) receives 
air conditioner control-related signals from the KOS 
via the CAN bus lines. If the ECU cannot receive any 
of the air conditioner control-related signals from the 
KOS, diagnosis code U0168 will be stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in KOS the CAN 

bus lines between the WCM and the heater con-
troller assembly (A/C-ECU), the power supply 
system to the WCM, the WCM itself, or the 
A/C-ECU may be faulty.

Past trouble

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the heater controller assembly 
(A/C-ECU) and the WCM, and the power supply 
system to the WCM. For diagnosis procedures, 
refer to "How to treat past trouble" (Refer to 
GROUP 00 

− How to Treat Past Trouble ).?

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-13

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Cope with Intermittent Mal-
function  and check the CAN bus lines. You can 
narrow down the possible cause of the trouble by 
referring to the diagnosis code, which is set 
regarding the CAN communication-linked ECUs 
(Refer to GROUP 54C 

−

 CAN Bus Line Diagnos-

tic Flow ).

CAUTION

If the ignition switch is turned to the ON position 
without starting the engine, the diagnosis code 
U0168 (past trouble) may be set to the heater 
controller assembly (A/C-ECU) after three min-
utes.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the KOS 

• Malfunction of the heater controller assembly 

(A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C Troubleshooting ). On completion, go to 
Step 6.

STEP 2. M.U.T.-III other system diagnosis code
Check whether the KOS-related diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Diagnose the KOS. (Refer to GROUP 42B 

"Symptom chart").

NO : 

Go to Step 3.

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

• ETACS-ECU

U0168: KOS timeout

Q: Is the diagnosis code set?

YES : 

Go to Step 4.

NO : 

Go to Step 5.

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the KOS, and then go to Step 6.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the WCM and the heater controller 
assembly (A/C-ECU) (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the heater controller assembly 

(A/C-ECU), and then go to Step 6. 

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the WCM and the heater controller 
assembly (A/C-ECU) (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-14

Code No. U0184: Audio CAN time-out

CAUTION

If diagnosis code No.U0184 is set in the heater 
controller assembly (A/C-ECU), diagnose the 
CAN main bus line.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

The heater controller assembly (A/C-ECU) receives 
air conditioner control-related signals from the audio 
system via the CAN bus lines. If the ECU cannot 
receive any of the air conditioner control-related sig-
nals from the audio system, diagnosis code U0184 
will be stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the audio system and the heater 
controller assembly (A/C-ECU), the power supply 
system to the audio system, the audio system 
itself, or the heater controller assembly 
(A/C-ECU) may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the heater controller assembly 
(A/C-ECU) and the audio system, and the power 
supply system to the audio system. For diagnosis 
procedures, refer to "How to treat past trouble" 
(Refer to GROUP 00 

− How to Treat Past Trouble 

). 

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Cope with Intermittent Mal-
function  and check the CAN bus lines. You can 
narrow down the possible cause of the trouble by 
referring to the diagnosis code, which is set 
regarding the CAN communication-linked ECUs 
(Refer to GROUP 54C 

−

 CAN Bus Line Diagnos-

tic Flow ).

CAUTION

If the ignition switch is turned to the ON position 
without starting the engine, the diagnosis code 
U0184 (past trouble) may be set to the heater 
controller assembly (A/C-ECU) after three min-
utes.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the audio

• Malfunction of the heater controller assembly 

(A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C, Troubleshooting ). On completion, go 
to Step 6.

STEP 2. M.U.T.-III other system diagnosis code
Check whether the audio-related diagnosis code is 
set.

Q: Is the diagnosis code set?

YES : 

Diagnose the audio. Refer to .

NO : 

Go to Step 3

STEP 3. M.U.T.-III other system diagnosis code
Check if a diagnosis code, which relates to CAN 
communication-linked systems below, is set.

• Audio

U0184: Audio-related time-out diagnosis code

Q: Is the diagnosis code set?

YES : 

Go to Step 4

NO : 

Go to Step 5

STEP 4. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the audio, and then go to Step 6.

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the audio and the heater controller 
assembly (A/C-ECU) (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-15

STEP 5. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Replace the heater controller assembly 

(A/C-ECU), and then go to Step 6. 

NO : 

A poor connection, open circuit or other 
intermittent malfunction in the CAN bus line 
between the audio and the heater controller 
assembly (A/C-ECU) (Refer to GROUP 00 

− 

How to Cope with Intermittent Malfunction ).

STEP 6. Check whether the diagnosis code is 
reset.
Recheck if the diagnosis code is set.
(1) Erase the diagnosis code.
(2) Ignition switch: LOCK (OFF) to ON
(3) Check if the diagnosis code is set.

Q: Is the diagnosis code set?

YES : 

Return to Step 1.

NO : 

The procedure is complete.

Code No. U0230: Power Gate CAN time-out

CAUTION

If diagnosis code No.U0230 is set in the heater 
controller assembly (A/C-ECU), diagnose the 
CAN main bus line.

CAUTION

Whenever the ECU is replaced, ensure that the 
communication circuit is normal.

TROUBLE JUDGMENT

The heater controller assembly (A/C-ECU) receives 
air conditioner control-related signals from the elec-
tric tailgate via the CAN bus lines. If the ECU cannot 
receive any of the air conditioner control-related sig-
nals from the electric tailgate, diagnosis code U0230 
will be stored.

COMMENTS ON TROUBLE SYMPTOM

Current trouble

• Connector(s) or wiring harness in the CAN bus 

lines between the electric tailgate and the heater 
controller assembly (A/C-ECU), the power supply 
system to the electric tailgate, the electric tailgate 
itself, or the heater controller assembly 
(A/C-ECU) may be defective.

Past trouble

• Carry out diagnosis with particular emphasis on 

connector(s) or wiring harness in the CAN bus 
lines between the heater controller assembly 
(A/C-ECU) and the electric tailgate, and the 
power supply system to the electric tailgate. For 
diagnosis procedures, refer to "How to treat past 
trouble" (Refer to GROUP 00 

− How to Treat Past 

Trouble ). 

NOTE: For a past trouble, you can not find it by the 

M.U.T.-III CAN bus diagnostics even if there is 
any failure in CAN bus lines. In this case, refer to 
GROUP 00, How to Cope with Intermittent Mal-
function  and check the CAN bus lines. You can 
narrow down the possible cause of the trouble by 
referring to the diagnosis code, which is set 
regarding the CAN communication-linked ECUs 
(Refer to GROUP 54C 

−

 CAN Bus Line Diagnos-

tic Flow ).

CAUTION

If the ignition switch is turned to the ON position 
without starting the engine, the diagnosis code 
U0230 (past trouble) may be set to the heater 
controller assembly (A/C-ECU) after three min-
utes.

PROBABLE CAUSES

• Damaged wiring harness or connectors

• Malfunction of the audio

• Malfunction of the heater controller assembly 

(A/C-ECU)

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics
Use the M.U.T.-III to diagnose the CAN bus lines.

Q: Is the check result normal?

YES : 

Go to Step 2.

NO : 

Repair the CAN bus lines (Refer to GROUP 
54C, Troubleshooting ). On completion, go 
to Step 6.