Mitsubishi Colt Ralliart. Manual - part 684

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-61

STEP 5. Check for leakage of exhaust emission 
from exhaust manifold.

Q: Is the check result normal?

YES : 

 Go to Step 6 .

NO : 

Repair for leakage of exhaust emission from 
exhaust manifold.

STEP 6. Check throttle body (throttle valve 
portion) for contamination. 

Q: Is the check result normal?

YES : 

 Go to Step 7 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13B-358

).

STEP 7. Connector check: A-122 oxygen sensor 
(front) connector, A-114 engine-ECU connector.

Q: Is the check result normal?

YES : 

 Go to Step 8 .

NO : 

Repair or replace the connector.

STEP 8. Check A-122 oxygen sensor (front) itself.

• Check oxygen sensor (front) itself (Refer to 

P.13B-365

).

Q: Is the check result normal?

YES : 

 Go to Step 9 .

NO : 

Replace the oxygen sensor (front).

AK402087

Connector: A-122

Harness side 

connector

A-122(G)

AC

Oxygen sensor

AK402745

6

4

2

5

3

1

9

7

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66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-62

STEP 9. Check harness between A-122 (terminal 
No. 1) oxygen sensor (front) connector and A-114 
(terminal No. 34) engine-ECU connector.

• Check output line for damage.

Q: Is the check result normal?

YES : 

 Go to Step 10 .

NO : 

Repair the damaged harness wire.

STEP 10. Connector check: Injector connector

a. A-102 (No.1 injector connector)
b. A-103 (No.2 injector connector)

c. A-104 (No.3 injector connector)

d. A-105 (No.4 injector connector)

Q: Is the check result normal?

YES : 

 Go to Step 11 .

NO : 

Repair or replace the connector.

STEP 11. Check injector itself.

• Check Injector itself (Refer to 

P.13B-367

).

Q: Is the check result normal?

YES : 

 Go to Step 12 .

NO : 

Replace the injector.

AK402087

Connector: A-122

Harness side 

connector

A-122(G)

AC

Oxygen sensor

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

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52

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62

63

64

65

66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

AK600602

M

1

2

AB

A-102 (G)

A-103 (G)

A-105 (G)

A-104 (G)

Connector: A-102, A-103, A-104, A-105

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-63

STEP 12. Connector check: B-106 engine control 
relay connector and A-114 engine-ECU 
connector.

Q: Is the check result normal?

YES : 

 Go to Step 13 .

NO : 

Repair or replace the connector.

STEP 13. Check harness between B-106 engine 
control relay connector and injector connector.

a. Check harness between B-106 (terminal No. 4) 

engine control relay connector and A-102 (termi-
nal No. 1) No. 1 injector connector.

b. Check harness between B-106 (terminal No. 4) 

engine control relay connector and A-103 (termi-
nal No. 1) No. 2 injector connector.

c. Check harness between B-106 (terminal No. 4) 

engine control relay connector and A-104 (termi-
nal No. 1) No. 3 injector connector.

d. Check harness between B-106 (terminal No. 4) 

engine control relay connector and A-105 (termi-
nal No. 1) No. 4 injector connector.

NOTE: Before checking harness, check intermediate 

connectors B-112 and repair if necessary.

• Check power supply line for damage.

3

2

1

4

AK402084

J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402745

6

4

2

5

3

1

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64

65

66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

3

2

1

4

AK402084

J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK600602

M

1

2

AB

A-102 (G)

A-103 (G)

A-105 (G)

A-104 (G)

Connector: A-102, A-103, A-104, A-105

Harness side
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-64

Q: Are the check results normal?

YES : 

 Go to Step 14 .

NO : 

Repair the damaged harness wire.

STEP 14. Check harness between injector 
connector and A-114 engine-ECU connector.

a. Check harness between A-102 (terminal No. 2) 

No. 1 injector connector and A-114 (terminal No. 
8) engine-ECU connector.

b. Check harness between A-103 (terminal No. 2) 

No. 2 injector connector and A-114 (terminal No. 
9) engine-ECU connector.

c. Check harness between A-104 (terminal No. 2) 

No. 3 injector connector and A-114 (terminal No. 
23) engine-ECU connector.

d. Check harness between A-105 (terminal No. 2) 

No. 4 injector connector and A-114 (terminal No. 
24) engine-ECU connector.

• Check earthing line for damage.

Q: Are the check results normal?

YES : 

 Go to Step 15 .

NO : 

Repair the damaged harness wire.

STEP 15. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13B-358

).

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Repair the fuel pressure.

AK600602

M

1

2

AB

A-102 (G)

A-103 (G)

A-105 (G)

A-104 (G)

Connector: A-102, A-103, A-104, A-105

Harness side
connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

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66

L

AF

A-114

Connector: 

A-114

Harness side connector

Engine-ECU

Battery

Main

Index

Group

TOC