Mitsubishi Outlander (2013+). Manual — part 742

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-24

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 ).

STEP 2. M.U.T.-III diagnosis code
Check whether the A/C sets a diagnosis code or not.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Refer to diagnosis code chart

P.55-7

.

STEP 3. Voltage measurement at A/C compressor
assembly connector.
(1) Disconnect the connector, and measure at the

wiring harness side.

(2) Turn the ignition switch to the "ON" position.
(3) Disconnect engine-ECU connector and earth

terminal 102.

(4) Voltage between terminal 1 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Go to Step 8.

STEP 4. Check the A/C compressor.
Refer to

P.55-51

.

Q: Is the check result normal?

YES :

Go to Step 5.

NO :

Replace the A/C compressor.

STEP 5. Check the refrigerant temperature
switch.
Refer to

P.55-54

.

Q: Is the refrigerant temperature switch operating

properly?
YES :

Go to Step 6.

NO :

Replace the refrigerant temperature switch.

STEP 6. Check the refrigerant level.
Refer to

P.55-34

.

Q: Is the refrigerant level correct?

YES :

Go to Step 7.

NO :

Correct the refrigerant level (Refer to
On-vehicle Service

P.55-34

).

STEP 7. Replace the A/C-ECU, and then recheck
the trouble symptom
Check that the compressor works normally.

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Replace the engine-ECU (Refer to GROUP
13A

− Engine-ECU ).

STEP 8. Check the A/C compressor relay
Refer to

P.55-41

.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Replace the A/C compressor relay.

STEP 9. Voltage measurement at A-14X A/C
compressor relay connector.
(1) Remove the relay, and measure at the relay block

side.

(2) Voltage between terminal 2, 4 and body earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 11.

NO :

Go to Step 10.

STEP 10. Check of open circuit in A/C
compressor relay power supply line between
fusible link and A/C compressor relay connector.

Q: Is the check result normal?

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the wiring harness.

STEP 11.Check of open circuit in A/C
compressor relay power supply line between A/C
compressor relay connector and A/C
compressor assembly connector.

NOTE: Prior to the wiring harness inspection, check
intermediate connector and repair if necessary.

Q: Is the check result normal?

YES :

Go to Step 12.

NO :

Repair the connector(s) or wiring harness.

STEP 12. Check of open circuit in AC/R line
(engine-ECU) between A/C compressor relay
connector and engine-ECU connector.

Q: Is the check result normal?

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-25

YES :

The trouble can be an intermittent

malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).

NO :

Repair the connector(s) or wiring harness.

INSPECTION PROCEDURE 7: A/C outlet air temperature cannot be set

COMMENTS ON TROUBLE SYMPTOM

If the air conditioner outlet temperature cannot be
adjusted, the air mixing damper control motor or the
heater controller assembly (A/C-ECU) may be faulty.

NOTE: It cannot be adjusted while the engine cool-
ant temperature is low.

PROBABLE CAUSES

• Malfunction of the air mix damper control motor

• Malfunction of the heater controller assembly

(A/C-ECU)

DIAGNOSTIC PROCEDURE

STEP 1. Check the compressor operation
Check that the compressor operates under the fol-
lowing conditions.

• Engine operation

• Air volume control dial: Maximum

• Air conditioner switch: ON

• Temperature control dial: MAX COOL

Q: Is the check result normal?

YES :

Go to Step 2.

NO :

Refer to INSPECTION PROCEDURE 6:
"The A/C compressor does not work

P.55-23

.

STEP 2. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.

Q: Is the diagnosis code set?

YES :

Carry out the diagnosis code procedures.

Refer to

P.55-7

.

NO <Single-zone AUTO A/C> :

Go to Step 3.

NO <Dual-zone AUTO A/C> :

Go to Step 5.

STEP 3. M.U.T.-III actuator test
Carry out the actuator test. (Refer to

P.55-31

).

Item No.17: As air mix damper motor (Select
"Damper position setting".)

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Go to Step 4.

STEP 4. Check of open circuit in IG1, A/DA,
A/DA’, A/DB, A/DB’ line between air mixing
damper control motor connector and heater
controller assembly (A/C-ECU) connector.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the connector(s) or wiring harness.

STEP 5. M.U.T.-III actuator test
Carry out the actuator test. (Refer to

P.55-31

).

Item No.16: Dr air mix damper motor (Select
"Damper position setting".)

Q: Is the check result normal?

YES :

Go to Step 7.

NO :

Go to Step 6.

STEP 6. Check of open circuit in IG1, A/DA,
A/DA’, A/DB, A/DB’ line between air mixing
damper control motor connector (LH) and heater
controller assembly (A/C-ECU) connector.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the connector(s) or wiring harness.

STEP 7. M.U.T.-III actuator test
Carry out the actuator test. (Refer to

P.55-31

).

Item No.17: As air mix damper motor (Select
"Damper position setting".)

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Go to Step 8.

STEP 8. Check of open circuit in IG1, A/PA, A/PA’,
A/PB, A/PB’ line between air mixing damper
control motor connector (RH) and heater
controller assembly (A/C-ECU) connector.

Q: Is the check result normal?

YES :

Go to Step 9.

NO :

Repair the wiring harness.

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-26

STEP 9. Replace the air mixing damper control
motor, and recheck the trouble symptom.
Check that A/C outlet air temperature can be
adjusted.

NOTE: Whenever the motor is replaced, initialise the
motor position by using the Actuator Test.

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Replace the heater controller assembly
(A/C-ECU).

INSPECTION PROCEDURE 8: Air outlets changeover is impossible.

COMMENTS ON TROUBLE SYMPTOM

If the air conditioner outlets changeover is impossi-
ble, the mode selection damper control motor or the
heater controller assembly (A/C-ECU) may be faulty.

PROBABLE CAUSES

• Malfunction of the mode selection damper control

motor

• Malfunction of the heater controller assembly

(A/C-ECU)

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III diagnosis code
Check that the diagnosis code related to the air con-
ditioner is not set.

Q: Is the diagnosis code set?

YES :

Carry out the diagnosis code procedures.

Refer to

P.55-7

.

NO :

Go to Step 2.

STEP 2. M.U.T.-III actuator test
Carry out the actuator test. (Refer to

P.55-31

).

Item 08: Air outlet c/o damper: (Select "posi-
tion reset".)

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Go to Step 3.

STEP 3. Check of open circuit in IG1, M/MA,
M/MA’ M/MB and M/MB’ line between mode
selection damper control motor and heater
control panel assembly (A/C-ECU) connector.

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Repair the connector(s) or wiring harness.

STEP 4. Replace the mode selection damper
control motor, and recheck the trouble symptom.
Check that the air outlets can be changed.

NOTE: Whenever the motor is replaced, initialise the
motor position by using the Actuator Test.

Q: Is the check result normal?

YES :

This diagnosis is complete.

NO :

Replace the heater controller assembly
(A/C-ECU).

INSPECTION PROCEDURE 9: Ambient temperature sensor system

CAUTION

• When the ETACS-ECU of vehicles without

KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Regis-
ter the encrypted code as described in
Immobilizer System

− How to Register Key ID

.)

COMMENTS ON TROUBLE SYMPTOM

If the ambient temperature sensor system is defec-
tive, a malfunction may be present in the wiring har-
ness between the ambient temperature sensor and
the ETACS-ECU.

PROBABLE CAUSES

• Malfunction of the ambient temperature sensor

• Malfunction of the ETACS-ECU

• Damaged wiring harness or connectors

TROUBLESHOOTING

HEATER, AIR CONDITIONER AND VENTILATION

55-27

DIAGNOSTIC PROCEDURE

STEP 1. Inspection of the ambient temperature
sensor
Refer to

P.55-49

.

Q: Is the A/C pressure sensor normal?

YES :

Go to Step 2.

NO :

Replace the ambient temperature sensor.

STEP 2. Check of open circuit in AMB+ and AMB-
line (ETACS-ECU) between ambient temperature
sensor connector and ETACS-ECU connector.

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Repair the connector(s) or wiring harness.

STEP 3. Check the data list below on the
M.U.T.-III.
All the following items in the data list should be nor-
mal (Refer to

P.55-29

).

Item No.19: Ambient temperature sensor

Q: Is the check result normal?

YES :

Go to Step 4.

NO :

Replace the ETACS-ECU.

STEP 4. Retest the system.

Q: Is the check result normal?

YES :

Intermittent malfunction (Refer to GROUP

00

− How to Use

Troubleshooting/Inspection Service Points -
How to Cope with Intermittent Malfunction ).

NO :

Replace the ETACS-ECU.

INSPECTION PROCEDURE 10: A/C pressure sensor system

COMMENTS ON TROUBLE SYMPTOM

If the A/C pressure sensor system is defective, the
wiring harness between the A/C pressure sensor and
the heater controller assembly (A/C-ECU) is sus-
pected.

PROBABLE CAUSES

• Malfunction of the A/C pressure sensor

• Malfunction of the heater controller assembly

(A/C-ECU)

• Damaged wiring harness or connectors

INSPECTION PROCEDURE 11: Blower motor power supply system

CAUTION

• When the ETACS-ECU of vehicles without

KOS is replaced, the encrypted code of the
ignition key needs to be registered to the
ETACS-ECU. (If the encrypted code is not reg-
istered, the engine cannot be started. Regis-
ter the encrypted code as described in
Immobilizer System

− How to Register Key ID

.)

COMMENTS ON TROUBLE SYMPTOM

If the blower motor is not energised, the blower relay
system is suspected.

PROBABLE CAUSES

• Malfunction of the blower relay

• Damaged wiring harness or connectors

• Malfunction of the ETACS-ECU

DIAGNOSTIC PROCEDURE

STEP 1. Measure the voltage at blower relay
connector.
(1) Remove the relay, and measure at the junction

block side.

(2) Voltage between terminals 2, 4 and body earth

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 3.

NO :

Go to Step 2.

STEP 2. Check of open circuit in blower relay
power supply line between blower relay
connector and fusible link (5).

NOTE: Prior to the wiring harness inspection, check
ETACS-ECU connector and repair if necessary.

Q: Is the check result normal?