Mitsubishi Montero (2004+). Manual — part 637
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-37
STEP 4. Check the refrigerant level.
Q: Is the refrigerant level correct?
YES : Go to Step 5.
NO : Correct the refrigerant level (Refer to On-vehicle
Service
). Check that the air conditioning
works normally.
STEP 5. Check the A/C compressor clutch relay continuity.
Follow the table below to check the A/C compressor clutch
relay for continuity.
Q: Is the A/C compressor clutch relay in good condition?
YES : Go to Step 6.
NO : Replace the A/C compressor clutch relay. Check that
the air conditioning works normally.
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
AE
A/C
COMPRESSOR
CLUTCH RELAY
BATTERY
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-38
STEP 6. Measure the voltage at A/C compressor connector
B-30.
(1) Disconnect A/C compressor connector B-30 and measure
the voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Turn the A/C switch to the "ON" position.
(4) Turn the blower switch to the "ON" position.
(5) Measure the voltage between terminal 3 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 7.
NO : Go to Step 8.
STEP 7. Check the magnetic clutch operation.
Connect the battery (+) terminal to the air conditioning com-
pressor clutch connector terminal 3, and ground the battery (
−)
terminal to the body of the compressor. The condition is normal
if the sound of the magnetic clutch (click) can be heard.
Q: Can the sound of the magnetic clutch (click) be heard?
YES : Check that the air conditioning works normally.
NO : Replace the compressor magnet clutch. Check that
the air conditioning works normally.
AC204169
CONNECTOR : B-30
AE
B-30(B)
B-30(B)
2
3
1
HARNESS
SIDE
AC204738 CY
HARNESS SIDE : B-30
2
3
1
ACX01440AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-39
STEP 8. Measure the voltage at A/C compressor connector
B-30.
(1) Disconnect A/C compressor connector B-30 and measure
the voltage at the harness side.
(2) Disconnect powertrain control module connector D-132.
(3) Ground powertrain control module connector D-132
(terminal 8).
(4) Turn the ignition switch to the "ON" position.
(5) Measure the voltage between terminal 3 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 19.
NO : Go to Step 9.
AC204169
CONNECTOR : B-30
AE
B-30(B)
B-30(B)
2
3
1
HARNESS
SIDE
AC204171
CONNECTOR : D-132
D-132(GR)
D-132(GR)
AS
HARNESS SIDE
8
23
1110
24
9
6
22
7
16
17
15
3
4
1312
19
20
2726
2
1
5
14
21
25
18
AC205176
8
23
1110
24
9
6
22
7
16
17
15
3
4
13 12
19
20
27 26
2
1
5
14
21
25
18
HARNESS SIDE : D-132
AB
AC204738 CY
HARNESS SIDE : B-30
2
3
1
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-40
STEP 9. Measure the voltage at A/C compressor clutch
relay connector A-12X.
(1) Disconnect A/C compressor connector A-12X and measure
the voltage at the relay box side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 3 and ground.
• The measured value should be approximately 12 volts
(battery positive voltage).
Q: Does the measured voltage correspond with this range?
YES : Go to Step 12.
NO : Go to Step 10.
STEP 10. Check A/C compressor clutch relay connector
A-12X for damage.
Q: Is A/C compressor clutch relay connector A-12X in
good condition?
YES : Go to Step 11.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
that the air conditioning works normally.
STEP 11. Check the wiring harness between A/C
compressor clutch relay connector A-12X (terminal 3) and
the ignition switch (IG2).
AC204183
CONNECTOR : A-12X
AP
RELAY BOX
SIDE
2 1
5
4
3
AC204738 CV
RELAY BOX SIDE : A-12X
2 1
5
4
3
AC204183
CONNECTOR : A-12X
AP
RELAY BOX
SIDE
2 1
5
4
3
AC204183
CONNECTOR : A-12X
AP
RELAY BOX
SIDE
2 1
5
4
3
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