Mitsubishi Outlander (2003+). Manual — part 99
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-259
STEP 5. Connector check: C-06 A/C-ECU
connector <Manual A/C> or C-26 A/C-ECU
connector <Auto A/C> and C-135 engine-ECU
connector
Q: Is the check result normal?
YES :
Check intermediate connector C-104, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between C-06 (terminal No. 4) or
C-26 (terminal No. 34) A/C-ECU connector
and C-135 (terminal No. 45) engine-ECU
connector.
Check output line for open circuit.
NO :
Repair.
STEP 6. Connector check: C-135 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
STEP 7. MUT-II data list
Item 28: 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?
YES :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
NO :
Replace engine-ECU.
AK300326
8
16
7
15
6
14
5
13
4
12
3
11
2
10
1
9
Harness side
connector
C-06 (B)
AB
Connector: C-06
<Manual A/C>
AK300327
28
36
27
35
26
34
25
33
24
32
23
31
22
30
21
29
Harness side
connector
C-26 (B)
AB
Connector: C-26
<Auto A/C>
AK300256
34 33 32
36 35
37
42
45
31
39
38
46
40
41
43
44
AB
CONNECTOR: C-135
C-135
Harness side connector
AK300256
34 33 32
36 35
37
42
45
31
39
38
46
40
41
43
44
AB
CONNECTOR: C-135
C-135
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-260
Inspection Procedure 27: A/C Compressor Relay System
3
4 5 6
1 2
1
2
3
4
1
1
14
4
19
5
22
6
17
8
15
9
18
7
20
16
2
13
12
23 24 25 26
21
3
10 11
AK300328
R
IG2
ST
LOCK
ACC
IG1
5
7.5A
10
10A
L-R
L-R
L-R
G
Ignition switch
C-303
4
C-203
2
C-205
16
C-106
11
J/B
A/C compressor relay
Engine-ECU
C-134
Battery
Relay box
B-R
B-W
B-R
W
4
3
1
1
2
B-18X
A/C-ECU
B-27
(MU802653)
A/C refrigerant
temperature
switch
A/C compressor
assembly
Magnetic
clutch
9
A-14
A/C compressor relay Circuit
8
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AB
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-261
OPERATION
The battery voltage is applied to the A/C com-
pressor relay (terminal No. 4).
The battery voltage is applied to the A/C com-
pressor relay (terminal No. 3) from the ignition
switch. The engine-ECU (terminal No. 8) makes
the power transistor in the unit be in "ON" posi-
tion and makes currents go on the A/C compres-
sor relay coil, and that makes the relay be in "ON"
position.
When the A/C compressor is in "ON" position, the
battery voltage is supplied to the A/C compressor
(terminal No. 1) from the A/C compressor relay
(terminal No. 1).
FUNCTION
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 CAUSE
Failed A/C compressor relay
Failed A/C compressor magnet clutch
Open/short circuit in A/C compressor relay circuit
or loose connector contact
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-18X A/C
compressor relay connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair.
STEP 2. A/C compressor relay check.
Check A/C compressor relay (Refer to GROUP
55A
-
On-vehicle Service
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace A/C compressor relay.
STEP 3. Measure voltage at B-18X A/C
compressor relay connector.
Remove relay, and measure at relay box side.
Ignition switch: ON
Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
AK300329
2
1
3
4
AB
CONNECTOR: B-18X
B-18X
Harness side
connector
Relay box’s
triangle marks
AK300329
2
1
3
4
AB
CONNECTOR: B-18X
B-18X
Harness side
connector
Relay box’s
triangle marks
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-262
STEP 4. Connector check: C-303 ignition switch
connector
Q: Is the check result normal?
YES :
Check intermediate connectors C-106, C-
202 <Auto A/C>, C-203 and C-205 <Manual
A/C>, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-18X
(terminal No. 3) A/C compressor relay
connector and C-303 (terminal No. 4)
ignition switch connector.
Check power supply line for
open/short circuit.
NO :
Repair.
STEP 5. Measure voltage at B-18X A/C
compressor relay connector.
Remove relay, and measure at relay box side.
Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Check intermediate connector A-14, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-18X (terminal No. 4)
A/C compressor relay connector and
battery.
Check power supply line for
open/short circuit.
STEP 6. Connector check: B-27 A/C compressor
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
1
2
3
4
5
6
AK300304
CONNECTOR: C-303
C-303
Harness side
connector
AB
AK300329
2
1
3
4
AB
CONNECTOR: B-18X
B-18X
Harness side
connector
Relay box’s
triangle marks
AK300329
2
1
3
4
AB
CONNECTOR: B-18X
B-18X
Harness side
connector
Relay box’s
triangle marks
AK300330
1
AB
CONNECTOR: B-27
B-27 (B)
Harness side
connector
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