Mitsubishi L200. Manual — part 178
TROUBLESHOOTING
DIESEL FUEL
13A-508
Inspection Procedure 22: A/C Switch System
OPERATION
• The battery voltage is applied to the engine-ECU
(terminal No. 8) from the A/C switch module.
PROBABLE CAUSES
• Failed A/C
• Failed A/C system
• Open/short circuit in A/C circuit or loose connec-
tor contact
• Failed engine-ECU
AKA00119
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BR-W
Engine-ECU
8
A/C evaporator air outlet thermistor <Manual A/C> or
A/C-ECU <Automatic A/C>
A/C Switch circuit
C-105
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V: Violet PU: Purple SI: Silver
AF
TROUBLESHOOTING
DIESEL FUEL
13A-509
DIAGNOSIS PROCEDURE
STEP 1. Perform voltage measurement at C-105
engine-ECU connector.
• Measure engine-ECU terminal voltage.
• Engine: Idling
• A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is 25
°C
or less
• Voltage between terminal No. 8 and earth.
OK:
System voltage (when A/C is ON)
0.5 V or less (when A/C is OFF)
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Check A/C system (Refer to GROUP 55A
−
Troubleshooting
− Check Chart for Trouble
Symptoms <Manual A/C>, GROUP 55B
−
Troubleshooting
− Check Chart for Trouble
Symptoms <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. M.U.T.-III data list
• Item 25: A/C switch
a. Engine: Idling
b. A/C set temperature:
Maximum Cool when temperature in cabin is
25
°C or more
Maximum Hot when temperature in cabin is
25
°C or less
OK:
ON (when A/C is ON)
OFF (when A/C is OFF)
Q: Is the check result normal?
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
AKA00089
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C-105 (B)
C-105 (B)
<R.H. drive vehicles>
Harness side connector
<L.H. drive vehicles>
Connector: C-105
AB
TROUBLESHOOTING
DIESEL FUEL
13A-510
YES :
Intermittent malfunction (Refer to GROUP
00
− How to Use Troubleshooting/
Inspection Service Points
− How to Cope
with Intermittent Malfunctions ).
NO :
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 ).
TROUBLESHOOTING
DIESEL FUEL
13A-511
Inspection Procedure 23: A/C Compressor Relay System
AKB00294
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1
1 2 3
4 5 6
Fusible link
W
IG2
ST
LOCK
ACC
IG1
16
7.5A
4
10A
L-R
L-R
L-R
O
Ignition switch
4
C-207
C-210
7
J/B
A/C compressor relay
Relay
box
L-W
L-W
L-W
B-O
B-O
4
1
3
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19
2
A-21X
A-33
MU802655
A/C compressor and clutch assembly
A/C
compressor
clutch assembly
4
A-115
A/C Compressor Relay Circuit
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Grey
R: Red P: Pink V: Violet PU: Purple SI: Silver
C-105
Engine-ECU
9
6
A-28
A-28
A-27
C-307
OFF
ON
R
20
4
5
AB
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