Mitsubishi Colt Ralliart. Manual — part 67
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-222
STEP 13. Check harness between B-26 (terminal
No. 6) accelerator pedal position sensor
connector and A-08 (terminal No. 88) engine-ECU
connector or engine-CVT-ECU connector.
• Check output line for damage.
Q: Is the check result normal?
YES :
Go to Step 14 .
NO :
Repair the damaged harness wire.
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 the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
AK203205
1
6 5 4 3 2
AD
Connector: B-26
B-26 (B)
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
AG
A-08
Connector:
A-08
Harness side connector
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-223
Code No. P2226: Barometric Pressure Sensor System
FUNCTION
• The barometric pressure sensor converts the bar-
ometric pressure into a voltage signal and inputs
the signal to the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
• In response to the signal, the engine-ECU <M/T>
or engine-CVT-ECU <CVT> corrects the fuel
injection amount, etc.
TROUBLE JUDGMENT
Check Conditions
• 2 seconds later after the ignition switch has been
in ON position or the engine has started up.
• The battery voltage is 8 V or more.
Judgment Criteria
• The sensor output voltage is 4.5 V or more (Baro-
metric pressure of above 114 kPa or equivalent)
for 4 seconds.
or
• The sensor output voltage is 0.2 V or less (Baro-
metric pressure of below 5 kPa or equivalent) for
4 seconds.
PROBABLE CAUSE
• Failed barometric pressure sensor
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
• Reconfirmation of diagnosis code.
Q: Is the diagnosis code set?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
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) <4A9>
13A-224
Code No. U1073: Bus Off
CAUTION
If diagnosis code U1073 is output from
engine-ECU <M/T> or engine-CVT-ECU <CVT>,
surely perform CAN busline diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Condition
• Ignition switch is in "ON" position <M/T>.
• All the time <CVT>
Judgment Criterion
• When the buss off error is detected.
COMMENT ON TROUBLE SYMPTOM
• The failure is possibly caused by malfunction of
the harness and connector in CAN busline or by
malfunction in engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
PROBABLE CAUSES
• Failed harness and connector in CAN busline
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS
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 :
Correct CAN busline (Refer to 54D
−
Diagnosis
− Can Bus Diagnosis Table
), and then go to Step 3 .
STEP 2. M.U.T.-III diagnosis code
• Reconfirm whether the diagnosis code is output
from engine-ECU <M/T> or engine-CVT-ECU
<CVT>.
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 set?
YES :
Replace engine-ECU <M/T> or
engine-CVT-ECU <CVT>, 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 <M/T> or engine-CVT-ECU
<CVT>.
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 set?
YES :
Go to Step 1 .
NO :
Check end.
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-225
Code No. U1102: ABS-ECU Time-out
CAUTION
If diagnosis code U1102 is output from
engine-ECU <M/T> or engine-CVT-ECU <CVT>,
surely perform CAN busline diagnosis.
CAUTION
Replace ECU after certainly confirming that the
communication circuits are normal.
TROUBLE JUDGMENT
Check Conditions
• Ignition switch is in "ON" position <M/T>.
• While the cranking switch is in OFF position, or
when 3 seconds pass after the cranking switch is
in OFF from ON.
• The battery voltage is 10 V or more.
Judgment Criterion
• The signals cannot be received from ABS-ECU
through CAN busline.
COMMENT ON TROUBLE SYMPTOM
• Current malfunction
The failure is possibly caused by malfunction of the
harness and connector in CAN busline between
engine-ECU <M/T> or engine-CVT-ECU <CVT>
and ABS-ECU, by malfunction in the power sup-
ply system of ABS-ECU, in ABS-ECU itself, in
engine-ECU <M/T> or engine-CVT-ECU <CVT>.
• Past malfunction
Focus on diagnosing malfunction of the harness and
connector in CAN busline between engine-ECU
<M/T> or engine-CVT-ECU <CVT> and
ABS-ECU as well as malfunction in the power
supply system of ABS-ECU (Refer to GROUP 00
− How to Use Troubleshooting/Inspection Service
Points
− How to Cope with Intermittent Malfunc-
tions
).
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 GROUP54D
−
Diagnosis
−
CAN Bus Diagnosis Table
PROBABLE CAUSES
• Failed harness and connector in CAN busline
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
• Failed ABS-ECU
DIAGNOSIS
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 :
Correct CAN busline (Refer to GROUP54D
− Diagnosis − CAN Bus Diagnosis Table
), and then go to Step 6 .
STEP 2. M.U.T.-III other system diagnosis codes
• Confirm whether the diagnosis codes are output
from ABS-ECU.
Q: Is the diagnosis code set?
YES :
Perform the troubleshooting of ABS (Refer
to GROUP 35B
− Check Chart For
Diagnosis Codes
).
NO :
Go to Step 3 .
STEP 3. M.U.T.-III other system diagnosis codes
Confirm whether Diagnosis Code U1102: ABS-ECU
time-out is output from the following ECU having
CAN communication with ABS-ECU
• EPS-ECU
• Combination meter-ECU
Q: Is the diagnosis code set?
YES :
Go to Step 4 .
NO :
Go to Step 5 .
Main
Index
Group
TOC
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