Mitsubishi Montero (2002-2004). Manual — part 106
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-117
STEP 15. Measure the resistance at condenser fan motor
connector A-26.
(1) Disconnect condenser fan motor connector A-26, and
measure the resistance at the wiring harness side.
(2) Measure the resistance value between terminal 2 and
ground.
• 2 ohms or less
Q: Does the measured resistance value correspond with
this range?
YES : No action to be taken.
NO : Go to Step 16.
STEP 16. Check condenser fan motor connector A-26 for
damage.
Q: Is condenser fan motor connector A-26 in good
condition?
YES : Go to Step 17.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
blower motor should operate normally.
STEP 17. Check the wiring harness between condenser fan
motor connector A-26 (terminal 2) and ground.
Q: Is the wiring harness between condenser fan motor
connector A-26 (terminal 2) and ground in good
condition?
YES : No action to be taken.
NO : Repair the wiring harness. The blower motor should
operate normally.
AC204167
CONNECTOR : A-26
AX
A-26(B)
A-26(B)
1
2
HARNESS SIDE
AC204738
HARNESS SIDE : A-26
1
2
DK
AC204167
CONNECTOR : A-26
AX
A-26(B)
A-26(B)
1
2
HARNESS SIDE
AC204167
CONNECTOR : A-26
AX
A-26(B)
A-26(B)
1
2
HARNESS SIDE
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-118
INSPECTION PROCEDURE 10: Malfunction of the A/C-ECU Power Supply System.
.
A/C-ECU Power Supply Circuit
AC204170
CONNECTORS : D-01, D-02, D-24, D-28,
D-29, D-30
DR
D-24(B)
D-30
D-01
D-28
D-29
D-02
AC204173
CONNECTORS : D-208, D-210
BF
D-208
D-210
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-119
TECHNICAL DESCRIPTION (COMMENT)
The A/C-ECU power system may be defective if the
air conditioning, defogger, and outside/inside air
changeover damper motor all do not operate nor-
mally.
.
TROUBLESHOOTING HINTS
• Malformation of the A/C-ECU
• Damaged harness wires or connectors
DIAGNOSIS
Required Special Tool:
• MB991223: Test Harness Set
STEP 1. Measure the voltage at A/C-ECU connector D-24.
(1) Disconnect A/C-ECU connector D-24 and measure the
voltage at the harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal 26 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 4.
NO : Go to Step 2.
STEP 2. Check A/C-ECU connector D-24 for damage.
Q: Is A/C-ECU connector D-24 in good condition?
YES : Go to Step 3.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
that the air conditioning works normally.
AC204170
CONNECTOR : D-24
D-24(B)
D-24(B)
CQ
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
HARNESS
SIDE
AC204738 DH
HARNESS SIDE : D-24
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
AC204170
CONNECTOR : D-24
D-24(B)
D-24(B)
CQ
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
HARNESS
SIDE
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-120
STEP 3. Check the wiring harness between A/C-ECU
connector D-24 (terminal 26) and the ignition switch (IG2).
NOTE: Also check joint connector (6) D-01, junction block con-
nectors D-210 and D-208. If joint connector (6) D-01, junction
block connectors D-210 or D-208 is damaged, repair or replace
the connector as described in GROUP 00E, Harness Connec-
tor Inspection
.
Q: Is the wiring harness between A/C-ECU connector D-24
(terminal 26) and the ignition switch (IG2) in good
condition?
YES : Check that the air conditioning works normally.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
AC204188
CONNECTOR : D-01, D-24
D-24(B)
D-24(B)
CM
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
HARNESS SIDE
9 10
8
6 7
31 32
30
29
18 19 20 21
5
4
2
1
3
27
26
24
23
25
12 13 14 15 16 17
28
11
22
33
D-01
HARNESS SIDE
D-01
AC204191
CONNECTORS: D-208, D-210
D-208
AC
HARNESS SIDE
HARNESS SIDE
D-210
D-208
D-210
1
2
3
5
6
4
1
2
7 6
3
9
4
11
12
10
13
5
8
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