Mitsubishi Colt Ralliart. Manual — part 727
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-233
STEP 11. Check harness between B-26 (terminal
No. 4) accelerator pedal position sensor
connector and A-08 (terminal No. 86) engine-ECU
connector.
• Check power supply line for damage.
Q: Is the check result normal?
YES :
Go to Step 12 .
NO :
Repair.
STEP 12. Check harness between B-26 (terminal
No. 3) accelerator pedal position sensor
connector and A-08 (terminal No. 83) engine-ECU
connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 13 .
NO :
Repair.
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
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
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
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-234
STEP 13. Check harness between B-26 (terminal
No. 6) accelerator pedal position sensor
connector and A-08 (terminal No. 88) engine-ECU
connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Repair.
STEP 14. Replace the accelerator pedal assembly
• After replacing the accelerator pedal assembly,
re-check the trouble symptoms.
Q: Is the check result normal?
YES :
Check end.
NO :
Replace engine-ECU.
AK402092
1
6 5 4 3 2
B-26(B)
AC
Connector: B-26
Harness side
connector
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-235
Code No. U1073: Bus Off
CAUTION
Perform CAN bus-line diagnosis whenever the
diagnosis code U1073 is set in the engine-ECU.
CAUTION
Replace the ECU only after confirming that the
communication circuits are normal.
TROUBLE JUDGEMENT
Check Condition
• Ignition switch is in "ON" position.
Judgement Criterion
• When bus off error is detected.
COMMENT ON TROUBLE SYMPTOM
• Most possible causes are defects in CAN bus-line
harnesses and connectors and malfunction of the
engine-ECU.
PROBABLE CAUSES
• Failed harnesses and connectors
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III CAN bus diagnosis
• Using the M.U.T.-III, perform CAN busline diag-
nosis.
Q: Is the check result normal?
YES :
Go to Step 2.
NO :
Correct CAN busline (Refer to GROUP 54D
− Troubleshooting − Can Bus Diagnosis
Table
). After repairing the CAN
busline, go to Step 3.
STEP 2. 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
3.
NO :
Intermittent malfunction (Refer to GROUP
00
− How to Use
Troubleshooting/Inspection Service Points
−
How to Cope with Intermittent Malfunctions
).
STEP 3. 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-236
Code No. U1102: ABS-ECU Time-out
CAUTION
Perform CAN bus-line diagnosis whenever the
diagnosis code U1102 is set in the engine-ECU.
CAUTION
Replace the ECU only after confirming that the
communication circuits are normal.
TROUBLE JUDGEMENT
Check Conditions
• Ignition switch is in "ON" position.
• Battery voltage is more than 10 V.
• Cranking switch is in the OFF position or 3 sec-
onds after turning the cranking switch from ON to
OFF.
Judgement Criterion
• Signals from the ABS-ECU via the CAN bus-line
cannot be received.
COMMENTS ON TROBLE SYMPTOMS
Current malfunction
• Most possible malfunctions are defects in CAN
bus-line harnesses and connectors between the
engine-ECU and ABS-ECU, malfunction in the
ABS-ECU power supply system, or malfunction
of the ABS-ECU or engine-ECU.
Past malfunction
• Focus on diagnosing malfunction of the harness
and connector in CAN busline between
engine-ECU and ABS-ECU as well as malfunc-
tion in the power supply system of ABS-ECU
(Refer to GROUP 00
− How to use Troubleshoot-
ing/Inspection Service Points
− How to Cope with
Intermittent Malfunctions
).
NOTE: In case of Past malfunction, M.U.T.-III CAN
bus diagnosis cannot detect the failure even if
there is malfunction in CAN bus, so that check
CAN busline in the same way as Intermittent mal-
function (Refer to GROUP 00
− How to use Trou-
bleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
The diagnosis codes being output to each ECU
with CAN communication can narrow down the
most suspected area. (Refer to GROUP 54D
−
Troubleshooting
− CAN Bus Diagnosis Table
PROBABLE CAUSES
• Failed harnesses and connectors in the CAN
busline
• Failed ABS-ECU
• Failed engine-ECU
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
• Confirm whether diagnosis codes are output from
ABS-ECU.
Q: Is the diagnosis code output?
YES :
Perform the troubleshooting of ABS. (Refer
to GROUP 35B
− Troubleshooting − Check
Chart for Diagnosis Code
NO :
Go to Step 3.
STEP 3. M.U.T.-III other system diagnosis codes
Check whether the diagnosis code U1102: ABS-ECU
time-out is output from the following ECU having
CAN communication with ABS-ECU.
• EPS-ECU
• Meter-A/C-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
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 ABS-ECU, and then go to Step 6.
NO :
Intermittent malfunction in the CAN busline
between the engine-ECU and ABS-ECU
(Refer to GROUP 00
− How to Cope with
Intermittent Malfunctions
).
Main
Index
Group
TOC
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