Mitsubishi Montero Sport (2004+). Manual — part 596
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-11
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.
STEP 2. 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
(3) When the high/low pressure sides of the dual pressure
switch are at operation pressure (ON) and there is
continuity between the respective terminals.
Q: When the high/low pressure sides of the dual pressure
switch are at operation pressure (ON), is there
continuity between the respective terminals?
YES : Go to Step 3.
NO : Replace the switch. Then go to Step 5.
STEP 3. Measure the automatic compressor controller
terminal voltage.
Refer to
.
Q: Is the automatic compressor controller terminal voltage
correct?
YES : Go to Step 4.
NO : Replace. Then go to Step 5.
STEP 4. Measure the powertrain control module terminal
voltage.
Refer to GROUP 13A, Diagnosis
− Check at the Powertrain
Control Module (PCM)
Q: Is the voltage correct?
YES : Go to Step 5.
NO : Replace. Then go to Step 5.
ITEM
DUAL PRESSURE SWITCH
FROM OFF TO
ON
FROM ON TO
OFF
Low-pressure side kPa
(psi)
221 (32.1)
196 (28.4)
High-pressure side kPa
(psi)
2,354 (341.4)
2,942 (426.7)
A003021
HIGH/LOW
PRESSURE SIDE
LOW-PRESSURE
SIDE
HIGH-PRESSURE
SIDE
ON
OFF
ON
OFF
AB
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-12
STEP 5. Retest the system.
Q: Does the system produce cool air?
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
.)
NO : Go to Step 1.
INSPECTION PROCEDURE 4: Blower Fan and Motor do not Operate.
DIAGNOSIS
STEP 1. Check the blower relay continuity.
Remove the blower relay and check continuity.
Q: Is the blower relay continuity in good condition?
YES : Go to Step 2.
NO : Replace. Then go to Step 5.
STEP 2. Check the blower fan and motor operation.
When battery voltage is applied between the terminals, check
that the motor operates.
Q: Is there any abnormal noise?
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
AC002841AB
BLOWER
RELAY
AC002855 AB
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-13
STEP 3. Check the blower switch continuity.
Remove the blower switch and check continuity.
Q: Is there continuity at the blower switch?
YES : Go to Step 4.
NO : Replace. Then go to Step 5.
STEP 4. Check the resistor resistance value.
Use an ohmmeter to measure the resistance between the ter-
minals as indicated below. Check that the measured value is at
the standard value.
Q: Is the measured value at the standard value?
YES : Go to Step 5.
NO : Replace. Then go to Step 5.
STEP 5. Retest the system.
Q: Do the blower fan and motor operate?
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
.)
NO : Go to Step 1.
SWITCH
POSITION
TESTER
CONNECTION
SPECIFIED
CONDITION
At the "OFF"
position
1
− 8
2
− 5
3
− 5
5
− 6
5
− 7
Open circuit
At the "LO" position 3
− 5
1
− 8
Less than 2 ohms
At the "ML" position 5
− 6
1
− 8
Less than 2 ohms
At the "MH"
position
2
− 5
1
− 8
Less than 2 ohms
At the "HI" position 5
− 7
1
− 8
Less than 2 ohms
AC002851AB
MEASUREMENT TERMINAL
STANDARD VALUE
Ω
Between terminals 2 and 3 (LO) 2.0
Between terminals 3 and 4 (ML) 1.1
Between terminals 3 and 1 (MH) 0.37
AC002856AB
MANUAL A/C DIAGNOSIS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55-14
INSPECTION PROCEDURE 5: Blower Fan and Motor do not Stop Operating.
DIAGNOSIS
STEP 1. Check the harness wires between the blower
switch connector C-07 (terminal No.2, 3 and 6), blower
resistor connector C-22 (terminal No.1, 2, 3, and 4), and the
blower fan motor connector C-21 (terminal No.2).
Q: Are the harness wires between the blower fan and
motor switch connector C-07 (terminal No.2, 3 and 6),
blower resistor connector C-22 (terminal No.1, 2, 3, and
4), and the blower fan motor connector C-21 (terminal
No.2) in good condition?
YES : Go to Step 2.
NO : Repair it. Then go to Step 4.
AC200770
AB
5
1
6
7
8
2
3
4
1
2
1
3
4
2
CONNECTOR: C-07, C-21, C-22
C-07
HARNESS SIDE
C-21
HARNESS SIDE
C-22
HARNESS SIDE
AB
C-07
C-21
C-22
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