Mitsubishi Outlander (2003+). Manual — part 101
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-267
Inspection Procedure 28: A/C Load Signal System
OPERATION
The A/C load signal is inputted to the engine-
ECU (terminal No. 24) from the A/C-ECU (termi-
nal No. 5). <Manual A/C> or (terminal No. 32)
<Auto A/C>
FUNCTION
The magnitude of the A/C compressor load is
detected and input to the engine-ECU. The
engine-ECU provides A/C idle up control accord-
ing to the A/C compressor load condition.
PROBABLE CAUSE
Failed A/C-ECU
Open/short circuit in A/C load signal circuit or
loose connector contact
Failed engine-ECU
AK300338
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9
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20
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23 24 25 26
21
3
10 11
5 <Manual A/C>
32 <Auto A/C>
24
6
C-106
Engine-ECU
A/C-ECU
A/C load signal circuit
AB
L-W
L-W
C-134
C-06
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
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-268
DIAGNOSIS PROCEDURE
STEP 1. Measure voltage at C-134 engine-ECU
connector.
Measure engine-ECU terminal voltage.
Engine: Idling
A/C switch: ON (A/C compressor in driven state)
Voltage between terminal No. 24 and earth
OK:
1 V or less (when the temperate around the
atmospheric air temperature sensor is 18
C
or more, and the A/C is set to the lowest tem-
perature and the maximum air flow rate)
System voltage (when the A/C is set to the
temperature in the cabin and the minimum
air flow rate)
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Go to Step 4 .
STEP 2. Connector check: C-134 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair.
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES :
Replace engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
).
STEP 4. Connector check: C-134 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair.
AK300257
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13 12
23
24
25
26
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3
10
11
AB
CONNECTOR: C-134
C-134
Harness side connector
AK300257
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4
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5
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23
24
25
26
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3
10
11
AB
CONNECTOR: C-134
C-134
Harness side connector
AK300257
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4
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5
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7
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23
24
25
26
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3
10
11
AB
CONNECTOR: C-134
C-134
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-269
STEP 5. Measure voltage at C-06 A/C-ECU
connector <Manual A/C> or C-26 A/C-ECU
connector <Auto A/C>.
Measure A/C-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. 5 and earth <Man-
ual A/C>
Voltage between terminal No. 32 and earth <Auto
A/C>
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector Check: C-06 A/C-ECU
connector <Manual A/C> or C-26 A/C-ECU
connector <Auto A/C>
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
AK300326
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1
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Harness side
connector
C-06 (B)
AB
Connector: C-06
<Manual A/C>
AK300327
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25
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24
32
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21
29
Harness side
connector
C-26 (B)
AB
Connector: C-26
<Auto A/C>
AK300326
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7
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6
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5
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4
12
3
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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>
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-270
STEP 7. Check harness between C-06 (terminal
No. 5) or C-26 (terminal No. 32) A/C-ECU
connector and C-134 (terminal No. 24) engine-
ECU connector.
NOTE: Before checking harness, check intermediate
connector C-104, and repair if necessary.
Check output line for short circuit.
Q: Is the check result normal?
YES :
Check A/C system (Refer to GROUP 55A
-
Troubleshooting
NO :
Repair.
STEP 8. Check connector: C-06 A/C-ECU
connector <Manual A/C> or C-26 A/C-ECU
connector <Auto A/C>
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. 5) or
C-26 (terminal No. 32) A/C-ECU connector
and C-134 (terminal No. 24) engine-ECU
connector.
Check output line for open circuit.
NO :
Repair.
AK300326
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16
7
15
6
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5
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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>
AK300257
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4
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5
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6
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8
15
9
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7
20
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2
13 12
23
24
25
26
21
3
10
11
AB
CONNECTOR: C-134
C-134
Harness side connector
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>
AK300257
1
14
4
19
5
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6
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8
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9
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7
20
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13 12
23
24
25
26
21
3
10
11
AB
CONNECTOR: C-134
C-134
Harness side connector
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