Mitsubishi L200. Manual - part 179
TROUBLESHOOTING
DIESEL FUEL
13A-512
OPERATION
• When the A/C switch "ON" signal is input to the
engine-ECU, the engine-ECU places the A/C
compressor relay in the "ON" position. Accord-
ingly, the battery voltage supplied to the A/C com-
pressor operates the magnet clutch.
PROBABLE CAUSES
• Failed A/C compressor relay
• Failed A/C compressor assembly
• Damaged harness (Open circuit between A/C
compressor relay and condenser fan relay, A/C
compressor relay and engine-ECU, A/C com-
pressor relay and A/C compressor, and open cir-
cuit between A/C compressor relay and relay
box)
• Damaged connector (A/C compressor relay con-
nector, A/C compressor connector, Engine-ECU
connector)
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III data list
• Refer to Data List Reference Table
.
a. Item 25: A/C switch
b. Item 26: A/C load signal
c. Item 27: A/C relay
Q: Are the check results normal?
YES :
Go to Step 2.
NO :
Check A/C system (Refer to GROUP 55A
−
Troubleshooting
− Trouble Symptom Chart
<Manual A/C>, GROUP 55B
−
Troubleshooting
− Trouble Symptom Chart
<Automatic A/C>).
STEP 2. Connector check: C-105 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3.
NO :
Repair or replace.
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace the engine-ECU. When the engine-
ECU is replaced, write the chassis number
(Refer to GROUP 00
− Precautions Before
Service
− How to Perform Chassis Number
Writing ). After replacing the engine-ECU,
register the injector identification code and
learn fuel injection (Refer to GROUP 00
−
Precautions Before Service
− What The
Common Rail Engine Learns ). After
registering the injector identification code,
the vehicle equipped with the DPF carries
out the forcible DPF regeneration. (Refer to
GROUP 17
− Emission Control − Diesel
Particulate Filter (DPF) System
− Forcible
DPF Regeneration ).
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunction ).
AKA00089
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
43
44
45
46
47
48
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB