Mitsubishi Montero (2002-2004). Manual - part 51

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-67

STEP 13. Check the air thermo sensor.
When the resistance between the sensor terminals is mea-
sured at two or more temperature conditions, the resistance 
should satisfy the value shown in the illustration.
NOTE: The temperature condition at the check shall be within 
the range shown in the characteristic diagram.
Q: Does air thermo sensor work normally?

YES :  Go to Step 14.
NO :  Replace the air thermo sensor.

STEP 14. Check the expansion valve (magnet valve).
The valve is in normal condition if the actuation sound is heard 
from the magnet valve when battery voltage is applied to mag-
net valve terminal 2 and terminal 1 is grounded.
Q: Does expansion valve work normally?

YES :  Go to Step 15.
NO :  Replace the expansion valve (magnet valve).

STEP 15. Check rear A/C unit connector G-24 and 
magnetic valve connector G-26-4 for damage.
Q: Is rear A/C unit connector G-24 and magnetic valve 

connector G-26-4 in good condition?
YES : Go to Step 16.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC001043

RESISTANCE k

Ω

8

6

4

2

0

-10

0

 10

 20

 30

   40

TEMPERATURE ˚C(˚F)

AB

(14)

(32)

(50)

(86)

(104)

(68)

1 2

AC102582

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204698

CONNECTOR : G-26-4

AM

HARNESS SIDE

2 1

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-68

STEP 16. Check the wiring harness between rear A/C unit 
connector G-24 (terminal 1 and 2) and magnetic valve 
connector G-26-4 (terminal 1 and 2).
NOTE: Also check intermediate connector G-26-1. If intermedi-
ate connector G-26-1 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the wiring harness between rear A/C unit connector 

G-24 (terminal 1 and 2) and magnetic valve connector G-
26-4 (terminal 1 and 2) in good condition?
YES : Go to Step 17.
NO :  Repair the wiring harness. Check that the rear air 

conditioning works normally.

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204699

CONNECTORS : G-26-1, G-26-4

AI

G-26-1

G-26-4

G-26-1

G-26-3

HARNESS SIDE

<VEHICLES WITH REAR A/C>

8

4

7

3

5

1

6

2

1
2

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-69

STEP 17. Check rear A/C unit connector G-24 and air 
thermo sensor connector G-26-3 for damage.
Q: Is rear A/C unit connector G-24 and air thermo sensor 

connector G-26-3 in good condition?
YES : Go to Step 18.
NO :  Repair or replace the connector. Refer to GROUP 

00E, Harness Connector Inspection 

P.00E-2

. Check 

that the rear air conditioning works normally.

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204698

CONNECTOR : G-26-3

AL

HARNESS SIDE

1
2

REAR AIR CONDITIONING DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-70

STEP 18. Check the wiring harness between rear A/C unit 
connector G-24 (terminal 4 and 8) and air thermo sensor 
connector G-26-3 (terminal 1 and 2).

NOTE: Also check intermediate connector G-26-1. If intermedi-
ate connector G-26-1 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector 
Inspection 

P.00E-2

.

Q: Is the wiring harness between rear A/C unit connector 

G-24 (terminal 4 and 8) and air thermo sensor connector 
G-26-3 (terminal 1 and 2) in good condition?
YES : Go to Step 19.
NO :  Repair the wiring harness. Check that the rear air 

conditioning works normally.

AC204179

CONNECTOR : G-24

AQ

HARNESS SIDE

1

2

3

4

AC204699

CONNECTORS : G-26-1, G-26-3

AH

G-26-1

G-26-3

G-26-1

G-26-3

HARNESS SIDE

8

4

7

3

5

1

6

2

1
2

<VEHICLES WITH REAR A/C>