Mitsubishi L200. Manual — part 848
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-8
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-33 A/C compressor
and clutch assembly connector and C-105
engine-ECU
AC509975AT
Harness side
Connector: A-33
A-33 (B)
AC509613 CB
Harness side
C-105 (B)
Connector: C-105 <LHD>
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
AC509930 CA
C-105 (B)
Connector: C-105 <RHD>
Harness side
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Voltage measurement at A-33 A/C
compressor and clutch assembly connector.
AC509975AT
Harness side
Connector: A-33
A-33 (B)
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
AC509613 CD
Harness side
C-105 (B)
Connector: C-105 <LHD>
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
AC509930 CA
C-105 (B)
Connector: C-105 <RHD>
Harness side
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
ACA00423
35
40
41
42
1817
38
39
15
16
14
3736
12
13
11
32
8
3433
9
10
30
31
7 6
29
5
4
28
3
27
2
26
1
25
19
43
2120
22
23
46
47
4544
24
48
76
52
86
62
63
64
65
66
67
68
69
70
71
72
92
95
96
93
94
89
90
91
8887
53
54
55
56
57
58
59
60
61
83
8584
8281
78
79
80
77
49
50
51
74
75
73
Connector C-105
(Harness side)
AB
(3) Disconnect engine-ECU connector C-105 and
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-9
earth terminal 19.
AC402679
Connector A-33
(Harness side)
CE
(4) Voltage between terminal 1 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Refer to Inspection Procedure 4 " The A/C
compressor and clutch assembly does not
work
STEP 3. Check that the blower motor operates
when the blower switch is moved to the "4 (HI)"
position.
(1) Turn the ignition switch to the "ON" position.
(2) Turn the blower switch to the "4 (HI) " position.
Q: Does the blower motor operate when the blower
switch is moved to the "4 (HI)" position?
YES :
Go to Step 4.
NO :
Refer to Inspection procedure 2 "The blower
does not work
."
STEP 4. Resistance measurement at the C-05 A/C
switch module connector.
AC509611AV
Connector: C-05 <LHD>
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
(1) Disconnect the connector, and measure at the
wiring harness side.
AC403234
Connector C-05
(Harness side)
CD
(2) Measure the resistance between terminal 5 and
body earth.
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Go to Step 6.
NO :
Go to Step 5.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-10
STEP 5. Check the wiring harness between C-05
A/C switch module connector terminal No.5 and
body earth.
AC509611AV
Connector: C-05 <LHD>
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
• Check the A/C switch module earth line for open
circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
NO :
Repair the wiring harness.
STEP 6. Voltage measurement at C-05 A/C switch
module connector.
AC509611AV
Connector: C-05 <LHD>
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
(1) Disconnect the connector, and measure at the
wiring harness side.
(2) Turn the ignition switch to the "ON" position.
AC402679
Connector C-05
(Harness side)
CF
(3) Measure the voltage between terminal 10 and
body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8.
NO :
Go to Step 7.
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-11
STEP 7. Check the wiring harness between C-05
A/C switch module connector terminal No.10 and
the ignition switch (IG2).
AC509611AV
Connector: C-05 <LHD>
Harness side
AC509932 BA
Harness side
Connector: C-05 <RHD>
NOTE:
AC509934 AS
Connectors: C-207, C-209 <LHD>
Harness side
C-209
C-207
Harness side
C-209
C-207
Junction block (Front view)
AC509936 AN
Connectors: C-207, C-209 <RHD>
Harness side
C-209
C-207
Harness side
C-209
C-207
Junction block (Front view)
Prior to the wiring harness inspection, check junction
block connector C-209 and C-207, and repair if nec-
essary.
• Check the blower relay power supply line for
open circuit.
Q: Is the check result normal?
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction ).
NO :
Repair the wiring harness.
STEP 8. Connector check: C-06 blower switch
connector
AC509611AW
Connector: C-06 <LHD>
Harness side
AC509932 BB
Harness side
Connector: C-06 <RHD>
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the connector.
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