Mitsubishi L200. Manual — part 861
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-60
(2) Turn the ignition switch to the "ON" position.
AC310507
Connector C-141X
(Junction block side)
JZ
(3) Voltage between terminal 3 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 21.
NO :
Go to Step 20.
STEP 20. Check the wiring harness between A-
141X PTC heater relay 2 connector terminal No.3
and the ignition switch (IG2).
AC509815
A-141X
Connector: A-141X
AD
Relay box side
NOTE:
AC509975AH
Connector: A-28
A-28 (B)
AC509613AW
Connector: C-148 <LHD>
AC509934 AX
Connectors: C-207, C-210 <LHD>
Harness side
C-207
C-210
Junction block (Front view)
Harness side
C-207
C-210
Prior to the wiring harness inspection, check junction
block connectors C-207, C-210, intermediate con-
nector A-28 and C-148, and repair if necessary.
• Check the PTC heater relay 2 power supply line
for open circuit.
Q: Is the check result normal?
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-61
YES :
The trouble can be an intermittent
malfunction (Refer to GROUP 00, How to
Cope with Intermittent Malfunction .)
NO :
Repair the wiring harness.
STEP 21. Voltage measurement at A-141X PTC
heater relay 2 connector.
AC509815
A-141X
Connector: A-141X
AD
Relay box side
(1) Remove the relay, and measure at the relay block
side.
AC310507
Connector C-141X
(Junction block side)
KA
(2) Voltage between terminal 2 and body earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 23.
NO :
Go to Step 22.
STEP 22. Check the wiring harness between A-
141X PTC heater relay 2 connector terminal No.2
and the fusible link (25).
AC509815
A-141X
Connector: A-141X
AD
Relay box side
• Check the PTC heater relay 2 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 23. Check the wiring harness between A-
141X PTC heater relay 2 connector terminal No.1
and C-105 engine-ECU connector terminal No.41.
AC509815
A-141X
Connector: A-141X
AD
Relay box side
AC509613CE
Connectors: C-105, C-148 <LHD>
C-148
C-148
C-105
Harness side
C-105 (B)
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
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-148, and repair if neces-
sary.
• Check the PTC heater relay 2 earth line for open
and short circuit.
Q: Is the check result normal?
TROUBLESHOOTING
HEATER, AIR CONDITIONER AND VENTILATION
55A-62
YES :
Go to Step 24.
NO :
Repair the wiring harness.
STEP 24. Check the wiring harness between A-
141X PTC heater relay 2 connector terminal No.4
and C-150 PTC heater connector terminal No.2.
AC509815
A-141X
Connector: A-141X
AD
Relay box side
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
• Check the PTC heater 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 25. Connector check: C-05 A/C switch
module controller connector
AC509611AV
Connector: C-05 <LHD>
Harness side
Q: Is the check result normal?
YES :
Go to Step 26.
NO :
Repair the connector.
STEP 26. Check the wiring harness between C-05
A/C switch module connector terminal No.1 and
C-105 engine-ECU connector terminal No.35.
AC509611AV
Connector: C-05 <LHD>
Harness side
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
NOTE: Prior to the wiring harness inspection, check
intermediate connector C-52, and repair if necessary.
•
AC509613AV
Connector: C-52 <LHD>
Check the A/C control module input line for open and
short circuit.
Q: Is the check result normal?
YES :
Go to Step 27.
NO :
Repair the wiring harness.
STEP 27. Check the trouble symptom
Check that the PTC heater works normally.
Q: Is the check result normal?
YES :
This diagnosis is complete.
NO :
Replace the engine-ECU.
ON-VEHICLE SERVICE
HEATER, AIR CONDITIONER AND VENTILATION
55A-63
CHECK AT A/C EVAPORATOR AIR
OUTLET THERMISTOR TERMINALS
M1552010302738
AC501416
<C-21>
AD
Terminal No.
Check items
Check conditions
Normal conditions
1
Earth
Always
1 V or less
2
Power supply
IG2: ON
System voltage
4
Output from A/C
evaporator air outlet
thermistor to engine-
ECU
Blower switch: 4
Temperature control dial: MAX cool
evaporator temperature of the back:
3
°C or higher
System voltage
Other than above
1 V or less
5
Communication with
A/C switch module
Temperature control dial: MAX cool System voltage
6
Communication with
A/C switch module
Temperature control dial: MAX cool System voltage
ON-VEHICLE SERVICE
A/C COMPRESSOR DRIVE BELT
TENSION CHECK AND ADJUSTMENT
M1552001001327
Refer to GROUP 11A, On-vehicle Service
− A/C
compressor drive belt tension check and adjustment
.
A/C COMPRESSOR CLUTCH TEST
M1552008500591
1. Disconnect the A/C compressor clutch connector
to the A/C compressor clutch.
AC407428
A/C compressor clutch connector
AB
2. Connect positive battery voltage directly to the
connector for the A/C compressor clutch.
3. If the A/C compressor clutch is normal, there will
be a "click." If the pulley and armature do not
make contact ("click"), there is a malfunction.
CHARGING AND DISCHARGING
M1552022200215
Use the refrigerant recovery unit to discharge refrig-
erant gas front the system.
NOTE: Refer to the Refrigerant Recovery and Recy-
cling Unit instruction Manual for operation of the unit.
CHECK THE REFRIGERANT LEVEL
M1552021700165
Remove the refrigerant by the flon reclaim machine
and replenish the specified quantity of refrigerant.
NOTE: Refer to the Refrigerant Recovery and Recy-
cling Unit instruction Manual for operation of the unit.
REFILLING OF OIL IN THE A/C SYSTEM
M1552020000259
Too little oil will provide inadequate compressor lubri-
cation and cause a compressor failure. Too much oil
will increase discharge air temperature.
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