Mitsubishi Colt Ralliart. Manual — part 32
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-82
TROUBLE JUDGMENT
Check Conditions
• After engine starts <M/T>
• Engine coolant temperature is 20°C or higher.
• While oxygen sensor (rear) heater is on <CVT>.
• Battery positive voltage is 11 − 16 V.
• Engine speed is approximately 50 r/min or more
<CVT>.
Judgment Criterion
• Oxygen sensor (rear) heater currents have con-
tinued to be 0.16 A or lower, or 5.0 A or higher for
4 seconds.
PROBABLE CAUSES
• Failed oxygen sensor (rear) heater
• Open/short circuit in oxygen sensor (rear) circuit
or loose connector contact
• Failed engine-ECU <M/T> or engine-CVT-ECU
<CVT>
DIAGNOSIS PROCEDURE
STEP 1. Connector check: B-53 oxygen sensor
(rear) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace the connector.
STEP 2. Perform resistance measurement at B-53
oxygen sensor (rear) connector.
• Disconnect connector, and measure at sensor
side.
• Resistance between terminal No. 3 and No. 4.
OK: 5
− 30 Ω (at 20°C)
Q: Is the check result normal?
YES :
Go to Step 3 .
NO :
Replace the oxygen sensor (rear).
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-83
STEP 3. Perform voltage measurement at B-53
oxygen sensor (rear) connector.
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 4 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 5 .
NO :
Go to Step 4 .
STEP 4. Connector check: B-106 engine control
relay connector
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
3
2
1
4
AK402060
B-106
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
Main
Index
Group
TOC
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4A9>
13A-84
Q: Is the check result normal?
YES :
Check intermediate connector B-112, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-53 (terminal No. 4)
oxygen sensor (rear) connector and B-106
(terminal No. 4) engine control relay
connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace the connector.
STEP 5. Perform voltage measurement at A-08
engine-ECU connector or engine-CVT-ECU
connector.
• Disconnect engine-ECU connector or
engine-CVT-ECU connector, and connect special
tool power plant ECU check harness
(MB991987), and then measure the voltage on
the check connector.
• Ignition switch: ON
• Voltage between terminal No. 79 and earth.
OK: System voltage
Q: Is the check result normal?
YES :
Go to Step 8 .
NO :
Go to Step 6 .
STEP 6. Connector check: A-08 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace the connector.
AK402725
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128
129
72 71
74 73
76 75
R
AH
A-08
Connector:
A-08
A-08 Special tool power plant ECU check
harness
Battery
Engine-ECU <M/T> or
engine-CVT-ECU <CVT>
AK402725
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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-85
STEP 7. Check harness between B-53 (terminal
No. 3) oxygen sensor (rear) connector and A-08
(terminal No. 79) engine-ECU connector or
engine-CVT-ECU connector.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace the engine-ECU <M/T> or
engine-CVT-ECU <CVT>.
NO :
Repair the damaged harness wire.
STEP 8. Connector check: A-08 engine-ECU
connector or engine-CVT-ECU connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace the connector.
AK402019
3
2
1
4
Oxygen sensor (rear)
Connector: B-53
B-53 Harness side connector
AC
B-53
AK402725
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112
113
114
130
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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>
AK402725
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78
79
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92
93
94
95
96
97
98
99
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86
87
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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
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