Mitsubishi Colt Ralliart. Manual — part 719
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-201
Code No. P1602: Communication Malfunction (between Engine-ECU Main Processor and System LSI)
FUNCTION
• Engine-ECU checks the communication status
for abnormal conditions.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is ON position.
Judgement Criteria
• The communication between Main microcom-
puter and system LSI is abnormal.
PROBALE CAUSE
• Failed engine-ECU <M/T>
DIAGNOSIS
STEP 1. 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
−
How to Cope with Intermittent Malfunctions
).
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-202
Code No. P1603: Battery Backup Circuit Malfunction
OPERATION
• Power is directly supplied to the engine-ECU (ter-
minal No. 82) from the battery.
FUNCTION
• The engine-ECU checks the open circuit of bat-
tery backup line.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position.
Judgment Criterion
• For 2 seconds, battery backup voltage is less
than 6.
PROBABLE CAUSES
• Open/short circuit and damage in battery backup
line circuit or loose connector contact
• Failed engine-ECU
AK402698
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
43
AE
Fusible link
R
R-B
82
Battery
backup
Engine-ECU
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 P: Purple
10A
Battery Backup Circuit
A-08
19
B-112
J/B
B-108
1
1
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-203
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis 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
−
How to Cope with Intermittent Malfunctions
).
STEP 2. Perform voltage measurement at A-08
engine-ECU connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 82 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Check intermediate connector B-108 and
B-112, and repair if necessary. If
intermediate connector is normal, check and
repair harness between battery and A-08
(terminal No. 82) engine-ECU connector.
• Check power supply line for
open/short circuit.
STEP 3. Check harness between battery and A-08
(terminal No. 82) engine-ECU connector.
NOTE: Before checking harness, check intermedi-
ate connector B-108 and B-112, and repair if neces-
sary.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 4 .
NO :
Repair the damaged harness wire.
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
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-204
STEP 4. Connector check: A-08 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Repair or replace the connector.
STEP 5. M.U.T.-III diagnosis code.
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
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
Main
Index
Group
TOC
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст