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