Mitsubishi Outlander (2003+). Manual — part 102
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-271
Inspection Procedure 29: A/C Pressure Sensor System
OPERATION
A power voltage of 5 V is applied to the A/C pres-
sure sensor power terminal (terminal No. 3) from
the engine-ECU (terminal No. 81) and is earthed
to the engine-ECU (terminal No. 92) from the A/C
pressure sensor (terminal No. 1).
The sensor signal is inputted to the engine-ECU
(terminal No. 42) from the A/C pressure sensor
output terminal (terminal No. 2).
FUNCTION
The A/C pressure sensor detects the A/C refrig-
erant pressure and inputs the pressure signal to
the engine-ECU. The engine-ECU uses the sig-
nal for ON/OFF control of the magnet clutch of
the A/C compressor.
PROBABLE CAUSE
Failed A/C pressure sensor
Open/short circuit in A/C pressure sensor circuit
or loose connector contact
Failed engine-ECU
AK300339
5 V
3
2
1
34
33
32
36
35
37
42
45
31
39
38
46
40 41
43 44
82
78
81
80
89 90 9192
79
87
71
74
73
72
76
75
77
85
88
83 84
86
AB
Engine-ECU
81
92
42
A-02
(MU802509)
C-116
A/C-ECU
3
G-Y
G-R
G-R
G-R
BR
BR
BR
G-Y
17
A-14
1
2
A/C Pressure sensor circuit
A/C Pressure sensor
5
4
17
21
C-105
C-104
C-135
C-137
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-272
DIAGNOSIS PROCEDURE
STEP 1. MUT-II Data List
Refer to Data list reference table
a. Item 3A: A/C pressure sensor
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
NO :
Go to Step 2 .
STEP 2. Connector check: A-02 A/C pressure
sensor connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair.
STEP 3. Measure voltage at A-02 A/C pressure
sensor connector.
Disconnect connector, and measure at harness
side.
Ignition switch: ON
Voltage between terminal No. 3 and earth.
OK: 4.9
-
5.1 V
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Go to Step 4 .
STEP 4. Measure voltage at C-137 engine-ECU
connector.
Measure engine-ECU terminal voltage.
Ignition switch: ON
Voltage between terminal No. 81 and earth.
OK: 4.9
-
5.1 V
Q: Is the check result normal?
YES :
Go to Step 6 .
NO :
Go to Step 5 .
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-273
STEP 5. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Check intermediate connector A-14, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between A-02 (terminal No. 3) A/C
pressure sensor connector and C-137
(terminal No. 81) engine-ECU connector.
Check power line for open circuit.
NO :
Repair.
STEP 6. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair.
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-274
STEP 7. Check harness between A-02 (terminal
No. 3) A/C pressure sensor connector and C-137
(terminal No. 81) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector A-14, and repair if necessary.
Check power line for short circuit.
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
STEP 8. MUT-II Data List
Refer to Data list reference table
a. Item 3A: A/C pressure sensor
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
NO :
Replace engine-ECU.
STEP 9. Measure resistance at A-02 A/C pressure
sensor connector.
Disconnect connector, and measure at harness
side.
Resistance between terminal No. 1 and earth
OK: 2
W
or less
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Go to Step 10 .
STEP 10. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 11 .
NO :
Repair.
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
AK300340
1
2
3
Harness side
connector
A-02 (B)
AB
Connector: A-02
AK300254
82
78
8180
89
90
91
92
79
87
71
74 73 72
76 75
77
85
88
83
84
86
AB
CONNECTOR: C-137
C-137
Harness side connector
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