Mitsubishi Outlander GS45X. Manual - part 1010

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-67

STEP 4. Check the wiring harness between A/C-ECU 
connector C-109 (terminal 15) and ETACS-ECU connector 
C-317 (terminal 5).

• Check the A/C-ECU power supply line for open circuit.

Q: Is the wiring harness between A/C-ECU connector 

C-109 (terminal 15) and ETACS-ECU connector C-317 
(terminal 5) in good condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair the wiring harness. Check that the A/C works 

normally.

STEP 5. Measure the voltage at A/C-ECU connector C-109. 
(1) Disconnect A/C-ECU connector C-109 and measure the 

voltage at the harness side.

(2) Measure the voltage between terminal 13 and ground.

• The measured value should be approximately 12 volts 

(battery positive voltage).

Q: Is the measured voltage approximately 12 V?

YES :  Go to Step 7.
NO :   Go to Step 6.

STEP 6. Check the wiring harness between A/C-ECU 
connector C-109 (terminal 13) and the fusible link (36).
NOTE: Also check ETACS-ECU connectors C-307 and C-317 
for loose, corroded, or damaged terminals, or terminals pushed 
back in the connector. If ETACS-ECU connector C-317 is dam-
aged, repair or replace the connector as described in GROUP 
00E, Harness Connector Inspection 

P.00E-2

.

• Check the A/C-ECU power supply line for open circuit.

Q: Is the wiring harness between A/C-ECU connector 

C-109 (terminal 13) and the fusible link (36) in good 
condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair the wiring harness. Check that the A/C works 

normally.

AC608254BU

Harness side: C-109

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-68

STEP 7. Measure the resistance at A/C-ECU connector 
C-109.
(1) Disconnect A/C-ECU connector C-109, and measure at the 

wiring harness side.

(2) Measure the resistance between terminal 14 and ground.

• The measured value should be 2 ohms or less.

Q: Does the measured resistance value correspond with 

this range?
YES : Replace the A/C-ECU, and check that the A/C works 

normally.

NO :   Go to Step 8.

STEP 8. Check the wiring harness between A/C-ECU 
connector C-109 (terminal 14) and the ground.

• Check the A/C-ECU ground line for open circuit.

Q: Is the wiring harness between A/C-ECU connector 

C-109 (terminal 14) and ground in good condition?
YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunctions 

P.00-15

.

NO :  Repair the wiring harness. Check that the A/C works 

normally.

AC608812

Harness side: C-109

EF

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-69

INSPECTION PROCEDURE 3: The Compressor does not Work.

A/C Compressor Assembly Circuit

A/C
COMPRESSOR
CLUTCH RELAY

A/C
COMPRESSOR
ASSEMBLY

A/C
REFRIGERANT
TEMPERATURE
SWITCH

A/C
COMPRESSOR
CLUTCH

ENGINE-ECU

RELAY
BOX

FUSIBLE
LINK

36

ACA02728

MANUAL A/C DIAGNOSIS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-70

.

FUNCTION

Compressor that recovers the refrigerant, which 
evaporated in the evaporator and became a 
high-temperature and high-pressure gas, and turns it 
into liquid again.

.

PROBABLE CAUSES

• Insufficient refrigerant

• Malfunction of connector.

• Malfunction of the harness (A/C compressor cir-

cuit is open/shorted to ground)

• Malfunction of the A/C pressure sensor.

• Malfunction of the A/C compressor.

• Malfunction of the A/C compressor clutch relay.

• Malfunction of the A/C-ECU.

DIAGNOSIS

Required Special Tools:

• MB991223: Harness Set

• MB992006: Extra Fine Probe

• MB991658: Test Harness Set

•  MB991958: Scan Tool (M.U.T.-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: M.U.T.-III USB Cable

• MB991910: M.U.T.-III Main Harness A

AC702634

Connector: B-17

B-17 (B)

AB

AC803380

AB

Connector: B-16X <2.4L>

B-16X

AC702636 AC

Connector: B-16X <3.0L>

B-16X

AC702370AC

Connector: A-13

AC702635AC

Connector: B-11

B-11 (GR)