Mitsubishi Montero (2002-2004). Manual — part 96
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-77
DIAGNOSIS
STEP 1. Using scan tool MB991502, check actuator test
item 01, item 02, item 03 and item04: Blower motor.
Carry out the actuator test.
Item 01, 02, 03 and 04: Blower motor
Q: Do the check results show "Stop" (01 activated), "low
speed" (02 activated), "medium speed" (03 activated),
and "high speed" (04 activated)?
YES : Go to Step 4.
NO : Go to Step 2.
STEP 2. Check A/C-ECU connector D-23 and heater blower
controller unit connector D-17 for damage.
Q: Is A/C-ECU connector D-23 and heater blower controller
unit D-17 in good condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
blower motor should operate normally.
AC204171
CONNECTOR : D-17
AP
1
2
3
4
HARNESS
SIDE
AC204170
CONNECTOR : D-23
D-23(B)
D-23(B)
CP
HARNESS
SIDE
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-78
STEP 3. Check the wiring harness between A/C-ECU
connector D-23 (terminal 10) and heater blower controller
unit connector D-17 (terminal 3).
Q: Is the wiring harness between A/C-ECU connector D-23
(terminal 10) and heater blower controller unit
connector D-17 (terminal 3) in good condition?
YES : Go to Step 4.
NO : Repair the wiring harness. The blower motor should
operate normally.
STEP 4. Check the flexible flat cable (FFC).
(1) The FCC is connected to the automatic air conditioning
control panel assembly. Check that the FCC connection is
contaminated with foreign material or loose. (Refer to
(2) There should be continuity across the FFC terminals.
Q: Is the FFC normal?
YES : Go to Step 5.
NO : Repair the FFC. (Refer to
.) The blower
motor should operate normally.
AC204171
CONNECTOR : D-17
AP
1
2
3
4
HARNESS
SIDE
AC204170
CONNECTOR : D-23
D-23(B)
D-23(B)
CP
HARNESS
SIDE
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
AC205264AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-79
STEP 5. Check the blower switch.
Follow the table below to check the blower switch for continuity.
Q: Is the check result normal?
YES : Replace the A/C-ECU. The blower motor should
operate normally.
NO : Replace the automatic air-conditioning control panel.
The blower motor should operate normally.
SWITCH
POSITION
TESTER
CONNECTION
SPECIFIED
CONDITION
OFF
9
− 10
Less than 2 ohms
AUTO
8
− 9, 9 − 10
Less than 2 ohms
1
8
− 9
Less than 2 ohms
2
6
− 9, 8 − 9
Less than 2 ohms
3
6
− 9, 8 − 9, 9 − 10
Less than 2 ohms
4
6
− 9, 9 − 10
Less than 2 ohms
5
6
− 9
Open circuit
6
4
− 9, 6 − 9
Less than 2 ohms
7
4
− 9, 6 − 9, 9 − 10
Less than 2 ohms
8
4
− 9, 6 − 9, 8 − 9, 9 −
10
Less than 2 ohms
AC205403
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
AC
AC205260
OFF
AUTO
8
7
6
5
4
3
2
1
AB
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-80
INSPECTION PROCEDURE 6: Air Outlet Vent cannot be Changed.
DIAGNOSIS
Required Special Tools:
• MB991223: Test Harness Set
• MB991502: Scan Tool
STEP 1. Using scan tool MB991502, read the diagnostic
trouble code.
Q: Is diagnostic trouble code No.32 set?
YES : Check the air outlet changeover damper
potentiometer system. Refer to
.
NO : Go to Step 2.
Outlet Air Changeover Damper Motor Circuit
AC204170
CONNECTORS : D-22, D-23
EE
D-23(B)
D-22(B)
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