Mitsubishi Outlander (2003+). Manual — part 77
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-171
Code No. P1603: Battery Backup Line System
OPERATION
Power is directly supplied to the engine-ECU (ter-
minal No. 80) from the battery.
FUNCTION
The engine-ECU is check the open circuit of bat-
tery backup line.
TROUBLE JUDGMENT
Check Condition
Ignition switch: ON
Judgment Criterion
The battery backup line voltage 6 V or less.
PROBABLE CAUSE
Open/short circuit in battery backup line circuit or
loose connector contact
Failed engine-ECU
AK300297
82
78
81
80
89 90 9192
79
87
71
74
73
72
76
75
77
85
88
83 84
86
9
20A
AB
Battey
W
W-B
W-B
80
Engine-ECU
A-14
5
Relay box
C-137
Battery backup 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: Gray
R: Red P: Pink V: Violet
Battery
backup
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-172
DIAGNOSIS PROCEDURE
STEP 1 MUT-II self-diag code
Temporarily place the ignition switch in "LOCK"
(OFF) position, and 10 seconds after that, place it
in "ON" position again.
Q: Is the diagnosis code P1603 set?
YES :
Go to Step 2 .
NO :
Intermittent malfunction (Refer to GROUP
00
-
How to use Troubleshooting/Inspection
Service Points
STEP 2. Measure voltage at C-137 engine-ECU
connector.
Disconnect connector, and measure at harness
side.
Ignition switch: ON
Voltage between terminal No. 80 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check intermediate connector A-14, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between battery and C-137
(terminal No. 80) engine-ECU connector.
Check power supply line for
open/short circuit.
STEP 3. Connector check: C-137 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair.
STEP 4. 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
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
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-173
Code No. P1610: Immobilizer System
OPERATION
The signals are sent and received between
engine-ECU (terminal No. 51) and immobilizer-
ECU (terminal No. 7).
FUNCTION
Engine-ECU sends or receives the control sig-
nals to or from immobilizer-ECU to certify the
ignition key.
NOTE:
.
If the registered ignition keys are close each
other when starting the engine, radio interfer-
ence may cause this code to be displayed.
This code may be displayed when registering
the key encrypted code.
TROUBLE JUDGMENT
Check Condition
Ignition switch: ON
Judgment Criterion
Improper communication problems between the
engine-ECU and the immobilizer-ECU are
detected.
PROBABLE CAUSE
Open/short circuit in immobilizer system circuit or
loose connector contact
Failed immobilizer-ECU
Failed engine-ECU
AK300298
57 58
60 61
53
52
51
55
54
56
59
62
1
2
3 4 5 6 7
3
51
7
11
C-304
(MU801547)
C-104
Engine-ECU
Immobilizer-ECU circuit
Immobilizer-ECU
AB
V
V
C-136
C-304-1
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
Signal
transmission
circuit
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MFI)
13A-174
DIAGNOSIS PROCEDURE
STEP 1. Connector check: C-304 immobilizer-
ECU connector and C-136 engine-ECU connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair.
STEP 2. Check harness between C-304 (terminal
No. 3) immobilizer-ECU connector and C-136
(terminal No. 51) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector C-104, and repair if necessary.
Check output line for open/short circuit and dam-
age.
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair.
STEP 3. Check the trouble symptoms.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Intermittent malfunction (Refer to GROUP
00
-
How to Use
Troubleshooting/Inspection Service Points
).
STEP 4. After replacing the immobilizer-ECU, re-
check the trouble symptoms.
Q: Is the check result normal?
YES :
Replace engine-ECU.
NO :
Check end.
AK203418
2
7 6 5 4 3
1
AC
Connector: C-304
C-304
Harness side
connector
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
AK203418
2
7 6 5 4 3
1
AC
Connector: C-304
C-304
Harness side
connector
AK300268
58
60
61
53 52 51
55 54
56
59
62
57
AB
CONNECTOR: C-136
C-136
Harness side connector
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