Mitsubishi Colt Ralliart. Manual — part 729
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-241
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Using M.U.T.-III, perform CAN busline diagnosis.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Repair the CAN busline (Refer to GROUP
54D
− Troubleshooting − CAN Bus
Diagnosis Table
). After repairing
the CAN busline, go to Step 6.
STEP 2. M.U.T.-III other system diagnosis codes
• Check whether diagnosis codes is output from
meter-A/C-ECU.
Q: Is the diagnosis code output?
YES :
Perform troubleshooting of the air
conditioning system (Refer to GROUP 55B
−Troubleshooting
).
NO :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis codes
Check whether the diagnosis code U1110: A/C-ECU
time-out is output from the following ECU having
CAN communication with meter-A/C-ECU.
• ETACS-ECU
Q: Is the diagnosis code output?
YES :
Go to Step 4.
NO :
Go to Step 5.
STEP 4. M.U.T.-III diagnosis code
Reconfirm whether the diagnosis code is output from
engine-ECU.
1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.
Q: Is the diagnosis code output?
YES :
Replace the A/C-ECU, and then go to Step
6.
NO :
Intermittent malfunction in the CAN bus-line
between the engine-ECU and
meter-A/C-ECU (Refer to GROUP 00
− How
to use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent
Malfunctions
).
STEP 5. M.U.T.-III diagnosis code
• Reconfirm whether the diagnosis code is output
from engine-ECU.
1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.
Q: Is the diagnosis code output?
YES :
Replace engine-ECU, and then go to Step
6.
NO :
Intermittent malfunction in the CAN bus-line
between the engine-ECU and
meter-A/C-ECU (Refer to GROUP 00
− How
to use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent
Malfunctions
).
STEP 6. M.U.T.-III diagnosis code
• Reconfirm whether the diagnosis code is output
from engine-ECU.
1. Erase the diagnosis code being output.
2. Ignition switch: LOCK (OFF) to ON
3. Confirm whether the diagnosis code is output.
Q: Is the diagnosis code output?
YES :
Go to Step 1.
NO :
Check end.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-242
SYMPTOM PROCEDURES
Inspection Procedure 1: Communication with Engine-ECU is Not Possible
OPERATION
• Data is communicated between diagnosis con-
nector output terminal (terminal No. 7) and
engine-ECU (terminal No. 121).
COMMENT ON TROUBLE SYMPTOM
• The problem may probably be traced to
engine-ECU power circuit or earth circuit.
PROBABLE CAUSES
• Open/short circuit in or damage to the
engine-ECU power circuit
• Between engine-ECU and diagnosis connector
for open/short circuit or damage
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Check engine start.
Q: Does engine start?
YES :
Go to Step 2 .
NO :
Check engine-ECU power source, engine
control relay, and ignition switch-IG1 system
(Refer to Inspection Procedure 21
).
AK402806
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
R
92 93 94 95969798
77 78 79 808182838485868788899091
99
100
107 108 109 110 111112113114115116117118119120121
122 123 124 125126127128129130131132133134135136
101102103104105106
71 72
73 74
75 76
B-32
MU803797
20
121
7
B-41
Diagnosis Connector Circuit
AD
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: Viole
P: Purple
t
A-08
Engine-ECU
Diagnosis connector
O-L
O-L
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-243
STEP 2. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Repair or replace.
STEP 3. Check harness between B-32 (terminal
No. 7) diagnosis connector and A-08 (terminal
No. 121) engine-ECU connector.
NOTE: Before checking harness, check intermediate
connector B-41 and repair if necessary.
• Check signal line for open/short circuit or dam-
age.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair.
STEP 4. Check the trouble symptom.
Q: Does trouble symptom recur?
YES :
Replace engine-ECU.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
AK403279
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AC
Harness side connector
Connector: B-32
B-32(B)
AK402725
77
78
79
80
81
82
83
84
92
93
94
95
96
97
98
99
85
86
87
88
89
90
91
100
101
102
103
104
105
106
115
116
117
118
119
120
121
107
108
109
110
111
112
113
114
130
131
132
133
134
135
136
122
123
124
125
126
127
128
129
72 71
74 73
76 75
R
AI
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Engine-ECU
Battery
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-244
Inspection Procedure 2: The Engine Warning Lamp Does Not Illuminate Right after the Ignition Switch
is Turned to the "ON" Position
COMMENT ON TROUBLE SYMPTOM
• On the combination meter, engine warning lamp
illuminates for 5 seconds right after ignition switch
is turned ON.
• If engine warning lamp does not illuminate right
after ignition switch is turned ON, the failure is
possibly caused by malfunction of engine warn-
ing lamp, open or short in the combination meter
circuits and so on.
PROBABLE CAUSES
• Failed engine warning lamp
• Open/short circuit in combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code output?
YES :
Inspection chart for diagnosis codes (Refer
to
NO :
Go to Step 2 .
STEP 2. Check the trouble symptoms.
Q: Does trouble system persist?
YES :
Replace combination meter assembly.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Inspection Procedure 3: The Engine Warning Lamp Remains Illuminating and Never Goes Out
COMMENT ON TROUBLE SYMPTOM
• Engine-ECU has possibly detected the problem.
Probable causes include combination meter cir-
cuit being shorted.
PROBABLE CAUSE
• Short circuit in combination meter
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Q: Is the diagnosis code output?
YES :
Inspection chart for diagnosis codes (Refer
to
NO :
Go to Step 2 .
STEP 2. Check the trouble symptoms.
Q: Does trouble system persist?
YES :
Replace combination meter assembly.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
Main
Index
Group
TOC
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