Mitsubishi Montero (2002-2004). Manual — part 84
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-29
INSPECTION PROCEDURE 2: Air Conditioning does not Operate.
A/C Compressor Circuit
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-30
.
TECHNICAL DESCRIPTION (COMMENT)
If cool air is not distributed when the A/C switch is on,
the air thermo sensor or the A/C compressor relay
system may be defective.
.
AC204167
CONNECTORS : A-03, A-05,
A-15, A-22
BA
A-03(B)
A-05(B)
A-15
A-22(BR)
AC204183
CONNECTOR : A-12X
AQ
AC204169
CONNECTOR : B-30
AF
B-30(B)
AC204171BD
D-134(GR)
D-17
D-132(GR)
CONNECTORS : D-17, D-132, D-134
AC204170
CONNECTORS : D-23, D-28
DW
D-28
D-23(B)
AC204173
CONNECTORS : D-208, D-210
BF
D-208
D-210
AC204176 BM
CONNECTOR : E-111
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-31
TROUBLESHOOTING HINTS
• Malformation of the air thermo sensor
• Malformation of the dual pressure switch
• Malformation of the A/C compressor relay
• Malformation of the A/C refrigerant temperature
switch
• Malformation of the magnetic clutch
• Malformation of the A/C-ECU
• Malformation of the flexible flat cable
• Malformation of the automatic air-conditioning
control panel
• Malformation of the PCM
DIAGNOSIS
Required Special Tools:
• MB991223: Test Harness Set
• MB991502: Scan Tool
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code.
Q: Is a diagnostic trouble code set?
YES : Refer to
.
NO : Go to Step 2.
STEP 2. Check the defogger and outside/inside air
changeover damper control motor operation.
Q: Do the defogger and outside/inside air changeover
damper control motor work normally?
YES : Go to Step 3.
NO : Refer to Inspection Procedure 11 "Malfunction does
not operate
STEP 3. Check the blower motor operation.
Q: Does the blower motor work normally?
YES : Go to Step 4.
NO : Refer to Inspection Procedure 5 "Blower Fan and
motor does not tern
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.
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-32
STEP 5. 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 6.
NO : Replace the A/C compressor relay. Check that the air
conditioning works normally.
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.
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
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
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