Mitsubishi Montero Sport (2004+). Manual - part 597

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-15

STEP 2. Check the blower relay continuity.

Q: Is there continuity at the blower relay?

YES : Go to Step 3.
NO :  Replace. Then go to Step 4.

STEP 3. Check the blower switch continuity.

Q: Is there continuity at the blower switch?

YES : Go to Step 4.
NO :  Replace. Then go to Step 4.

BATTERY 
CONNECTION

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

AC002841AB

BLOWER

RELAY

SWITCH 
POSITION

TESTER 
CONNECTION 

SPECIFIED 
CONDITION

OFF

1 

− 8

2 

− 5

3 

− 5

5 

− 6

5 

− 7

Open circuit

LO

3 

− 5

1 

− 8

Less than 2 ohms

ML

5 

− 6

1 

− 8

Less than 2 ohms

MH

2 

− 5

1 

− 8

Less than 2 ohms

HI

5 

− 7

1 

− 8

Less than 2 ohms

AC002851AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-16

STEP 4. Retest the system.
Q: Does the blower motor stop operating?

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

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.00-7

.)

NO :  Go to Step 1.

INSPECTION PROCEDURE 6: When the A/C is Operating, Condenser Fan do not Operate.

DIAGNOSIS

STEP 1. Check the condensor fan control Relay continuity.

Remove the condensor fan control Relay and check continuity.

Q: Is there continuity at the condensor fan control Relay?

YES : Go to Step 2.
NO :  Replace. Then go to Step 4.

BATTERY 
CONNECTION

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

AC002843 AB

CONDENSER FAN

MOTOR RELAY

A/C

COMPRESSOR 

RELAY

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-17

STEP 2. Check the condenser fan motor operation.

Remove the condenser fan motor and check continuity.

Q: Is the condenser fan motor operating correctly?

YES : Go to Step 3.
NO :  Replace. Then go to Step 3.

STEP 3. Measure the PCM terminal voltage.

Refer to GROUP 13A, Check at PCM terminals 

P.13A-856

.

Q: Is the PCM voltage correct?

YES : Go to Step 4.
NO :  Replace. Then go to Step 4.

STEP 4. Retest the system.
NOTE: The condenser fan might not operate when there is an 
air conditioning low load from the air conditioning condenser 
control, so remove the negative battery terminal and then 
check the symptoms after 5 minutes since initial start control 
after reconnection.
Q: Is the condenser fan operating correctly?

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

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.00-7

.)

NO :  Go to Step 1.

BATTERY CONNECTION

MOTOR OPERATION

• Connect terminal 2 to the positive 

battery terminal

• Connect terminal 1 to the 

negative battery terminal

Rotates

AC002870AB

MANUAL A/C DIAGNOSIS

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-18

INSPECTION PROCEDURE 7: Even when the Rear Heater Switch is Pressed, the Blower Fan does not 
Turn.

DIAGNOSIS

STEP 1. Check the rear heater relay continuity.

Remove the rear heater relay and check continuity.

Q: Is there continuity at the rear heater relay?

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

STEP 2. Check the rear blower motor operation.

When battery voltage is applied between the terminals, check 
that the motor operates. Also, check that there is no abnormal 
noise.

Q: Is the rear blower motor operating correctly?

YES : Go to Step 3.
NO :  Replace. Then go to Step 5. 

BATTERY 
CONNECTION

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

AC002844 AB

REAR HEATER RELAY

BATTERY CONNECTION SPECIFIED CONDITION

• Connect terminal 1 to 

the positive battery 
terminal

• Connect terminal 3 to 

the negative battery 
terminal

Blower motor rotates (HI)

• Connect terminal 1 to 

the positive battery 
terminal

• Connect terminal 4 to 

the negative battery 
terminal

Blower motor rotates (LO)

AC002863AB