Mitsubishi Colt Ralliart. Manual — part 687
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TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-73
TROUBLE JUDGEMENT
Check Condition
• After engine starts
• Engine coolant temperature is more than 20°C.
• Battery voltage is more than 11 V and is less than
16 V.
Judgement Criterion
• For 4 seconds, oxygen sensor (front) heater cur-
rent is less than 0.16 A or more than 5.0 A.
PROBABLE CAUSES
• Failed oxygen sensor (front) heater
• Open/short circuit or damage in oxygen sensor
heater circuit, or loose connector contact
• Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. Connector check: A-122 oxygen sensor
(front) connector
Q: Is the check result normal?
YES :
Go to Step 2 .
NO :
Repair or replace.
STEP 2. Perform resistance measurement at
A-122 oxygen sensor (front) connector.
• Disconnect connector and measure at sensor
side.
• Resistance between terminals 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 oxygen (front) sensor.
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/finoued.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-74
STEP 3. Perform voltage measurement at A-122
oxygen sensor (front) connector.
• Disconnect connector and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 3 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
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
3
2
1
4
AK402084
J/B side
connector
B-106
Connector: B-106
J/B (front side)
AC
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/fou.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-75
Q: Is the check result normal?
YES :
Check intermediate connector A-17 and
B-112, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between A-122 (terminal
No. 3) oxygen sensor (front) connector and
B-106 (terminal No. 4) engine control relay
connector.
• Check power supply line for
open/short circuit.
NO :
Repair or replace.
STEP 5. Perform voltage measurement at A-114
engine-ECU connector.
• Disconnect engine-ECU connector, and connect
special tool power plant ECU check harness
(MB991987) and measure the voltage on the
check connector.
• Ignition switch: ON
• Voltage between terminal No. 51 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-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 7 .
NO :
Repair or replace.
AK402745
6
4
2
5
3
1
9
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66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402745
6
4
2
5
3
1
9
7
8
10
11
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66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
![](/vehicles/winoney/ama/flend/ply.png)
TROUBLESHOOTING
MULTIPORT FUEL INJECTION (MPI) <4G1>
13B-76
STEP 7. Check harness between A-122 (terminal
No. 4) oxygen sensor (front) connector and A-114
(terminal No. 51) engine-ECU connector.
• Check earthing line for open/short circuit.
Q: Is the check result normal?
YES :
Replace engine-ECU.
NO :
Repair.
STEP 8. Connector check: A-114 engine-ECU
connector
Q: Is the check result normal?
YES :
Go to Step 9 .
NO :
Repair or replace.
AK402087
Connector: A-122
Harness side
connector
A-122(G)
AD
Oxygen sensor (front)
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
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50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
AK402745
6
4
2
5
3
1
9
7
8
10
11
12
13
14
15
16
17
18
19
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31
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36
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44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
L
AF
A-114
Connector:
A-114
Harness side connector
Engine-ECU
Battery
Main
Index
Group
TOC
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