Mitsubishi Outlander (2003+). Manual — part 74
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-159
STEP 6. Measure voltage at C-134 engine-ECU
connector.
Disconnect connector, and measure at harness
side.
Ignition switch: ON
Voltage between terminal No. 4 and earth,
between terminal No. 5 and earth, between termi-
nal No. 17 and earth, also voltage between termi-
nal No. 18 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Check and repair harness between B-105
idle speed control servo and C-134 engine-
ECU.
1. Harness between idle speed control
servo terminal No. 1 and engine-
ECU connector terminal No. 4
2. Harness between idle speed control
servo terminal No. 3 and engine-
ECU connector terminal No. 17
3. Harness between idle speed control
servo terminal No. 4 and engine-
ECU connector terminal No. 5
4. Harness between idle speed control
servo terminal No. 6 and engine-
ECU connector terminal No. 18
Check power supply line for
open/short circuit.
STEP 7. Connector check: C-134 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Repair.
AK300257
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
AB
CONNECTOR: C-134
C-134
Harness side connector
1
2
3
4
5
6
AK300287
Harness side
connector
B-105 (B)
AB
Connector: B-105
AK300257
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
AB
CONNECTOR: C-134
C-134
Harness side connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-160
STEP 8. Check harness between B-105 idle
speed control servo and C-134 engine-ECU.
1. Harness between idle speed control servo termi-
nal No. 1 and engine-ECU connector terminal
No. 4
2. Harness between idle speed control servo termi-
nal No. 3 and engine-ECU connector terminal
No. 17
3. Harness between idle speed control servo termi-
nal No. 4 and engine-ECU connector terminal
No. 5
4. Harness between idle speed control servo termi-
nal No. 6 and engine-ECU connector terminal
No. 18
Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair.
STEP 9. Check harness between B-105 (terminal
No. 2 or No. 5) idle speed control servo
connector and B-17X (terminal No. 1) engine
control relay connector.
Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 10 .
NO :
Repair.
STEP 10. MUT-II Data List
Refer to Data list reference table
a. Item 45: Idle speed control position
Q: Is the check result normal?
YES :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
).
NO :
Replace engine-ECU.
1
2
3
4
5
6
AK300287
Harness side
connector
B-105 (B)
AB
Connector: B-105
AK300257
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
AB
CONNECTOR: C-134
C-134
Harness side connector
1
2
3
4
5
6
AK300287
Harness side
connector
B-105 (B)
AB
Connector: B-105
AK300255
2
1
3
4
Relay box’s
triangle marks
AB
CONNECTOR: B-17X
B-17X
Harness side
connector
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-161
Code No. P0551: Power Steering Fluid Pressure Switch System
CONDITION
The battery voltage is applied to the power steer-
ing fluid pressure switch (terminal No. 1) from the
engine-ECU (terminal No. 37).
FUNCTION
It is detected whether a load is applied on the
power steering fluid pump by steering or not, and
the signal is inputted to the engine-ECU. When
the power steering fluid pressure switch "ON" sig-
nal (a large load on the power steering fluid
pump) is inputted, the engine-ECU provides the
idle-up control.
TROUBLE JUDGMENT
Check Conditions
The intake air temperature is
-
10
C or higher.
The engine coolant temperature is approximately
30
C or higher.
Repeat, 10 times or more, the *1 running and
stop also *2 running.
*1 running: engine speed of 2,500 r/min or more
(Vehicle speed of 50 km/h or more).
*2 running: Vehicle speed of 1.5 km/h or less.
Judgment Criteria
The power steering pressure switch remains in
ON position.
PROBABLE CAUSE
Failed power steering fluid pressure switch
Open/short circuit in power steering fluid pres-
sure switch circuit or loose connector contact
Failed engine-ECU
AK300288
1
34
33
32
36
35
37
42
45
31
39
38
46
40 41
43 44
Engine-ECU
C-135
37
Y
Power steering pressure switch
B-28
(MU801211)
1
Power steering pressure switch
AB
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-162
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-28 power steering
fluid pressure switch connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair.
STEP 2. Measure voltage at B-28 power steering
fluid pressure switch connector.
Disconnect connector, and measure at harness
side.
Ignition switch: ON
Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 3 .
STEP 3. Measure voltage at C-135 engine-ECU
connector.
Measure engine-ECU terminal voltage.
Ignition switch: ON
Voltage between terminal No. 37 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Go to Step 5 .
AK300289
1
AB
Harness side
connector
CONNECTOR: B-28
B-28 (B)
AK300289
1
AB
Harness side
connector
CONNECTOR: B-28
B-28 (B)
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
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