Mitsubishi Montero (2002-2004). Manual — part 83
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-25
DIAGNOSIS
STEP 1. Communication check with other systems.
Q: Is communication with other systems possible using
scan tool MB991502?
YES : Go to Step 8.
NO : Go to Step 2.
STEP 2. Measure the voltage at data link connector D-118.
(1) Disconnect data link connector D-118, and measure the
voltage at the harness side.
(2) Measure the voltage between terminal 16 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 5.
NO : Go to Step 3.
STEP 3. Check data link connector D-118 for damage.
Q: Is data link connector D-118 in good condition?
YES : Go to Step 4.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
tool MB991502 should communicate with the vehicle
system.
AC204170
CONNECTOR : D-118
AN
HARNESS
SIDE
D-118(B)
D-118(B)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AC204738 DC
HARNESS SIDE : D-118
8
16
7
15
6
14
5
13
4
12
3
11
2
10
1
9
AC204170
CONNECTOR : D-118
AN
HARNESS
SIDE
D-118(B)
D-118(B)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-26
STEP 4. Check the wiring harness between data link
connector D-118 (terminal 16) and the fusible link (2).
NOTE: Also check intermediate connector D-28 and junction
block connectors D-211 and D-210. If intermediate connector
D-28, junction block connectors D-211 or D-210 is damaged,
repair or replace the connector as described in GROUP 00E,
Harness Connector Inspection
.
Q: Is the wiring harness between data link connector D-118
(terminal 16) and the fusible link (2) in good condition?
YES : Scan tool MB991502 should communicate with the
vehicle system.
NO : Repair the wiring harness. Scan tool MB991502
should communicate with the vehicle system.
AC204188
CONNECTORS : D-28, D-118
D-118(B)
D-118(B)
HARNESS SIDE
CE
D-28
D-28
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
8
16
7
15
6
14
5
13
4
12
3
11
2
10
1
9
AC204191
CONNECTORS : D-210, D-211
AI
D-210
D-210
D-211(B)
D-211(B)
HARNESS SIDE
HARNESS SIDE
1
2
7 6
3
9
4
11
12
10
13
5
8
1
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-27
STEP 5. Measure the resistance at data link connector D-
118.
(1) Disconnect data link connector D-118, and measure the
resistance at the wiring harness side.
(2) Measure the resistance value between terminal 4, 5 and
ground.
• 2 ohms or less
Q: Does the measured resistance value correspond with
this range?
YES : Replace scan tool MB991502. Scan tool MB991502
should communicate with the vehicle system.
NO : Go to Step 6.
STEP 6. Check data link connector D-118 for damage.
Q: Is data link connector D-118 in good condition?
YES : Go to Step 7.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
tool MB991502 should communicate with the vehicle
system.
STEP 7. Check the wiring harness between data link
connector D-118 (terminal 4, 5) and ground.
Q: Is the wiring harness between data link connector D-118
(terminal 4, 5) and ground in good condition?
YES : Scan tool MB991502 should communicate with the
vehicle system.
NO : Repair the wiring harness. Scan tool MB991502
should communicate with the vehicle system.
AC204170
CONNECTOR : D-118
AN
HARNESS
SIDE
D-118(B)
D-118(B)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AC204738
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AC204738 EK
HARBESS SIDE : D-118
AC204170
CONNECTOR : D-118
AN
HARNESS
SIDE
D-118(B)
D-118(B)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AC204170
CONNECTOR : D-118
AN
HARNESS
SIDE
D-118(B)
D-118(B)
1
9
2
10
3
11
4
12
5
13
6
14
7
15
8
16
AUTO A/C DIAGNOSIS
TSB Revision
AUTOMATIC AIR CONDITIONING
55B-28
STEP 8. Check data link connector D-118, A/C-ECU
connector D-23 and D-24 for damage.
Q: Is data link connector D-118, A/C-ECU connector D-23
and D-24 in good condition?
YES : Go to Step 9.
NO : Repair or replace the connector. Refer to GROUP
00E, Harness Connector Inspection
tool MB991502 should communicate with the vehicle
system.
STEP 9. Check 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).
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 MB991502 should communicate with the vehicle
system.
NO : Repair the wiring harness. Scan tool MB991502
should communicate with the vehicle system.
AC204188
CONNECTORS : D-23, D-24, D-118
D-118(B)
D-118(B)
HARNESS SIDE
D-24(B)
HARNESS SIDE
D-23(B)
HARNESS SIDE
CF
D-24(B)
D-23(B)
8
16
7
15
6
14
5
13
4
12
3
11
2
10
1
9
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
AC204188
CONNECTORS : D-23, D-24, D-118
D-118(B)
D-118(B)
HARNESS SIDE
D-24(B)
HARNESS SIDE
D-23(B)
HARNESS SIDE
CF
D-24(B)
D-23(B)
8
16
7
15
6
14
5
13
4
12
3
11
2
10
1
9
1
3
4
2
12
1413
11
6
7
8
10 9
18
19
20
16
17
5
15
22
23
30
31
25
26
33
34
32
24
28
3635
27
29
21
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