Mitsubishi Montero (2002-2004). Manual — part 107
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-121
STEP 4. 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 27 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 5.
STEP 5. Check A/C-ECU connector D-24 for damage.
Q: Is A/C-ECU connector D-24 in good condition?
YES : Go to Step 6.
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 DI
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-122
STEP 6. Check the wiring harness between A/C-ECU
connector D-24 (terminal 27) and the ignition switch (ACC).
NOTE: Also check joint connector (5) D-29, junction block con-
nectors D-210 and D-208. If joint connector (5) D-29, junction
block connector 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 27) and the ignition switch (ACC) 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-24, D-29
D-24(B)
D-24(B)
CQ
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
HARNESS SIDE
D-29
D-29
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
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-123
STEP 7. 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) Measure the voltage between terminal 28 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 10.
NO : Go to Step 8.
STEP 8. Check A/C-ECU connector D-24 for damage.
Q: Is A/C-ECU connector D-24 in good condition?
YES : Go to Step 9.
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 DJ
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-124
STEP 9. Check the wiring harness between A/C-ECU
connector D-24 (terminal 28) and the fusible link (2).
NOTE: Also check intermediate connector D-28, joint connec-
tor (7) D-02. If intermediate connector D-28, joint connector (7)
D-02 is damaged, repair or replace the connector as described
in GROUP 00E, Harness Connector Inspection
Q: Is the wiring harness between A/C-ECU connector D-24
(terminal 28) and the fusible link (2) in good condition?
YES : Check that the air conditioning works normally.
NO : Repair the wiring harness. Check that the air
conditioning works normally.
STEP 10. Measure the resistance at A/C-ECU connector D-
24.
(1) Disconnect A/C-ECU connector D-24, and measure at the
wiring harness side.
(2) Measure the resistance between terminal 36 and ground.
• The measured value should be 2 ohms or less.
Q: Does the measured resistance value correspond with
this range?
YES : Go to Step 13.
NO : Go to Step 11.
AC204188
CONNECTORS : D-02, D-24, D-28
D-24(B)
D-24(B)
D-28
D-02
CC
HARNESS SIDE
D-28
D-02
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
2 3
27
32
28
33
16
15
4 5
19
18
29
17
34
7 8
35
22
21
9 10
30
36
31
37
25
24
23
6
20
1
14
26
11
13
12
38
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
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
HARNESS SIDE : D-24
DM
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
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