Mitsubishi Montero (2002-2004). Manual - part 36

 

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Mitsubishi Montero (2002-2004). Manual - part 36

 

 

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-7

STEP 3. Check the A/C compressor relay continuity.
Follow the table below to check the A/C compressor relay for 
continuity.

Q: Is the A/C compressor relay in good condition?

YES : Go to Step 4.
NO :  Replace the A/C compressor relay. Then go to Step 

10.

STEP 4. Check the magnetic clutch operation.
Connect the positive battery terminal to the air conditioning 
compressor clutch connector terminal 3 and ground the nega-
tive battery terminal to the body of the compressor. 
Q: Can the sound of the magnetic clutch (click) be heard?

YES : Go to Step 5.
NO :  Replace the magnetic clutch. Then go to Step 10.

BATTERY VOLTAGE

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

Not applied

4 

− 5

Open circuit

• Connect terminal 3 to 

the positive battery 
terminal

• Connect terminal 1 to 

the negative battery 
terminal

4 

− 5

Less than 2 
ohms

AC204715

3

1

4

5

AB

A/C 
COMPRESSOR 
RELAY

BATTERY

ACX01440AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-8

STEP 5. Check the dual pressure switch operation.
(1) Remove the dual pressure switch connector and connect 

the high/low pressure side terminals located on the harness 
side as shown in the illustration.

(2) Install a gauge manifold to the high-pressure side service 

valve of the refrigerant line. (Refer to 

P.55A-152

.)

(3) When the high/low pressure sides of the dual pressure 

switch are at operation pressure (ON) and the resistance is 
less than two ohm between the respective terminals, then 
the condition is normal. If open loop, replace the switch.

Q: Is the dual pressure switch operating properly?

YES : Go to Step 6.
NO :  Replace the dual pressure switch. Then go to Step 

10.

STEP 6. Check the A/C switch continuity.
Follow the table below to check the A/C switch for continuity.

Q: Is there continuity at the A/C switch?

YES : Go to Step 7.
NO :  Replace the A/C switch. Then go to Step 10.

ITEM

OFF to ON

ON to OFF

Low-pressure side kPa 
(psi)

223 

± 27 (32.4 

± 3.9)

196 

± 20 (28.4 

± 2.9)

High-pressure side kPa 
(psi)

2,550 

± 200 

(369.9 

± 29)

3,140 

± 200 

(455.5 

± 29)

ACX00822

ON

OFF

196 ± 20
(284 ± 2.9)

223 ± 27
(32.4 ± 3.9)

2,550 ± 200
(369.9 ± 29)

3,140 ± 200
(455.5 ± 29)

kPa
(psi)

DUAL PRESSURE 
SWITCH

AF

SWITCH 
POSITION

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

Off

5 

− 6

Open circuit

On

5 

− 6

Less than 2 ohms

AC001370

OFF

ON

BLOWER
SWITCH
ASSEMBLY

AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-9

STEP 7. Check the blower switch continuity.
Follow the table below to check the blower switch for continuity.

Q: Is there continuity the blower switch?

YES : Go to Step 8.
NO :  Replace the blower switch. Then go to Step 10.

STEP 8. Measure the automatic compressor controller 
terminal voltage.
Refer to 

P.55A-18

.

Q: Is the automatic compressor controller terminal voltage 

correct?
YES : Go to Step 9.
NO :  Replace the automatic compressor controller. Then 

go to Step 10.

STEP 9. Measure the powertrain control module terminal 
voltage.
Refer to GROUP 13A, Diagnosis 

− Check at the Powertrain 

Control Module (PCM) 

P.13Ab-43

.

Q: Is the terminal voltage correct?

YES : Go to Step 10.
NO :  Replace the PCM. Then go to Step 10.

STEP 10. Retest the system.
Q: Is the A/C operating properly?

YES : The procedure is complete. (If no malfunctions are 

not found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.)

NO :  Go to Step 1.

SWITCH 
POSITION

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

0 (OFF)

1 

− 3, 3 − 4, 3 − 5, 3 − 6 Open circuit

1 (LO)

3 

− 5

Less than 2 ohms

2 (ML)

1 

− 3

Less than 2 ohms

3 (MH)

3 

− 6

Less than 2 ohms

4 (HI)

3 

− 4

Less than 2 ohms

AC001371

BLOWER SWITCH
ASSEMBLY

AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-10

INSPECTION PROCEDURE 2: When the Air Outlet Changeover Control Knob is Moved to 
DEFROSTER or DEFROSTER/FOOT Position, the A/C or the Inside/outside Air Changeover Damper 
Motor does not Operate.

DIAGNOSIS

STEP 1. Check the defroster switch continuity.
Follow the table below to check the defroster switch for continu-
ity.

Q: Is the defroster switch in good condition?

YES : Go to Step 2.
NO :  Replace defroster switch. Then go to Step 2.

STEP 2. Check each A/C part.
Q: Does A/C operate normally?

YES : The procedure complete. (If no malfunctions are not 

found in all steps, an intermittent malfunction is 
suspected. Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

− How to 

Cope with Intermittent Malfunction 

P.00-6

.)

NO :  Go to Inspection Procedure 1.

INSPECTION PROCEDURE 3: When the A/C is Operating, Temperature Inside the Passenger 
Compartment does not Decrease (Cool Air is not Emitted).

DIAGNOSIS

STEP 1. Check for refrigerant leaks.
Q: Is the refrigerant leaking?

YES : Repair. Then go to Step 5.
NO :  Go to Step 2.

AIR OUTLET 
CHANGEOVER 
CONTROL KNOB 
POSITION

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

At the "DEFROSTER" or 
"DEFROSTER/FOOT" 
position

2 

− 3

Less than 2 ohms

1 

− 3

Open circuit

At the other positions

1 

− 3

Less than 2 ohms

2 

− 3

Open circuit

AC001398

HEATER
CONTROL
ASSEMBLY

AB

 

 

 

 

 

 

 

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