Mitsubishi Montero (2004+). Manual — part 636
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-33
NOTE: Also check junction block connectors D-220. If junction
block connectors D-220 is damaged, repair or replace the con-
nector as described in GROUP 00E, Harness Connector
Inspection
.
Q: Is the wiring harness between data link connector D-118
(terminal 11, 1), A/C-ECU connector D-23 (terminal 19)
and D-24 (terminal 33) in good condition?
YES : Replace the A/C-ECU (Refer to
). Scan
tool MB991958 should communicate with the vehicle
system.
NO : Repair the wiring harness. Scan tool MB991958
should communicate with the vehicle system.
AC204173
CONNECTOR : D-220
AI
HARNESS SIDE
1
2
3
7
8
6
5
10
4
9
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-34
INSPECTION PROCEDURE 2: Air Conditioning does not Operate.
A/C
COMPRESSOR
CLUTCH RELAY
IGNITION
SWITCH (IG2)
RELAY
BOX
LOW-PRESSURE
SIDE
DUAL
PRESSURE
SWITCH
DRIVE CIRCUIT
HEATER
BLOWER
CONTROLLER
UNIT
HIGH-PRESSURE
SIDE
A/C
COMPRESSOR
MAGNETIC
CLUTCH
A/C-ECU
POWERTRAIN
CONTROL
MODULE
JOINT
CONNECTOR
(2)
JUNCTION
BLOCK
FUSIBLE
LINK
1
A/C Compressor Circuit
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-35
.
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 clutch
relay system may be defective.
.
TROUBLESHOOTING HINTS
• Malformation of the air thermo sensor
• Malformation of the dual pressure switch
• Malformation of the A/C compressor clutch 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
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-36
DIAGNOSIS
Required Special Tools:
• MB991223: Harness Set
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: Vehicle Communication Interface (V.C.I.)
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Turn the ignition switch to the "ON" position.
(2) Check if the DTC is set.
(3) Turn the ignition switch to the "LOOK (OFF)" position.
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
AC307591 AB
MB991911
DATA LINK
CONNECTOR
MB991824
MB991827
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