Mitsubishi L200. Manual — part 886
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-73
NOTE: When the coolant temperature becomes
above 80 degrees celsius and PTC heater stops the
operation, the PTC heater does not operate until
coolant temperature becomes below 70 degrees cel-
sius.
PROBABLE CAUSES
• Malfunction of the heater switch system
• Damaged the wiring harness or connectors
• Malfunction of the PTC heater relay 1
• Malfunction of the PTC heater relay 2
• Malfunction of the PTC heater 1
• Malfunction of the PTC heater 2
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-149 PTC heater 1
connector
AC509613AT
Harness side
Connector: C-149 <LHD>
C-149 (GR)
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the connector.
STEP 2. Resistance measurement at the C-149
PTC heater 1 connector.
AC509613AT
Harness side
Connector: C-149 <LHD>
C-149 (GR)
(1) Disconnect the connector, and measure at the
wiring harness side.
AC310506HU
Connector C-149
(Harness side)
(2) Continuity between terminal 1 and body earth
OK: Continuity (Less than 2
Ω)
Q: Is the check result normal?
YES :
Go to Step 4.
NO :
Go to Step 3.
STEP 3. Check the wiring harness between C-149
PTC heater 1 connector terminal No.1 and body
earth.
AC509613AT
Harness side
Connector: C-149 <LHD>
C-149 (GR)
• Check the PTC heater 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 4. Resistance measurement at the C-150
PTC heater 2 connector.
AC509613 AU
Harness side
Connector: C-150 <LHD>
C-150 (GR)
(1) Disconnect the connector, and measure at the
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-74
wiring harness side.
AC310506HV
Connector C-150
(Harness side)
(2) Continuity between terminal 1 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.
STEP 5. Check the wiring harness between C-150
PTC heater 2 connector terminal No.1 and body
earth.
AC509613 AU
Harness side
Connector: C-150 <LHD>
C-150 (GR)
• Check the PTC heater 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. Connector check: C-105 engine-ECU
connector
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
Q: Is the check result normal?
YES :
Go to Step 7.
NO :
Repair the connector.
STEP 7. Voltage measurement at C-149 PTC
heater 1 connector.
AC509613AT
Harness side
Connector: C-149 <LHD>
C-149 (GR)
(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
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)
AE
(3) Disconnect engine-ECU connector C-105 and
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-75
earth terminal 36.
AC310507JD
Connector C-149
(Harness side)
(4) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 16.
NO :
Go to Step 8.
STEP 8. Connector check: A-140X PTC heater
relay 1 controller connector
AC509815
A-140X
Connector: A-140X
AB
Relay box side
Q: Is the check result normal?
YES :
Go to Step 9.
NO :
Repair the connector.
STEP 9. Check the PTC heater relay 1 continuity.
Refer to .
Q: Is the PTC heater relay 1 in good condition?
YES :
Go to Step 10.
NO :
Replace the PTC heater relay 1.
STEP 10. Voltage measurement at A-140X PTC
heater relay 1 connector.
AC509815
A-140X
Connector: A-140X
AB
Relay box side
(1) Remove the relay, and measure at the relay block
side.
(2) Turn the ignition switch to the "ON" position.
AC310507
Connector C-140X
(Junction block side)
JX
(3) Voltage between terminal 3 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 12.
NO :
Go to Step 11.
TROUBLESHOOTING
AUTOMATIC AIR CONDITIONER
55B-76
STEP 11. Check the wiring harness between A-
140X PTC heater relay 1 connector terminal No.3
and the ignition switch (IG2).
AC509815
A-140X
Connector: A-140X
AB
Relay box side
NOTE:
AC509975AH
Connector: A-28
A-28 (B)
AC509613AW
Connector: C-148 <LHD>
AC509934BW
Connectors: C-207, C-210 <LHD>
Harness side
Junction block (Front view)
C-210
C-207
C-207
C-210
Prior to the wiring harness inspection, check interme-
diate connectors C-148, A-28 and junction block con-
nector C-210,C-207 and repair if necessary.
• Check the PTC heater relay 1 earth 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 12. Voltage measurement at C-140X PTC
heater relay 1 connector.
AC509815
A-140X
Connector: A-140X
AB
Relay box side
(1) Remove the relay, and measure at the relay block
side.
AC310507
Connector C-140X
(Junction block side)
JY
(2) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 14.
NO :
Go to Step 13.
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