Mitsubishi Colt Ralliart. Manual - part 731

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-249

STEP 12. Check harness between B-105 (terminal 
No. 4) starter relay connector and A-114 (terminal 
No. 39) engine-ECU connector.

NOTE: Before checking harness, check intermediate 
connectors B-109 and A-17, and repair if necessary.

.

•

Check output line for open/short circuit and dam-
age.

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Repair.

STEP 13. Connector check: A-125 starter 
connector

Q: Is the check result normal?

YES : 

Go to Step 14 .

NO : 

Repair or replace.

STEP 14. Check harness between B-105 (terminal 
No. 4) starter relay connector and A-125 (terminal 
No. 1) starter connector.

NOTE: Before checking harness, check intermediate 
connectors B-109 and A-17, and repair if necessary.

.

•

Check output line for short circuit.

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair.

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

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

AK402055

1

Connector: A-125

A-125 Harness side
connector

AC

A-125 (B)

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK402055

1

Connector: A-125

A-125 Harness side
connector

AC

A-125 (B)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-250

STEP 15. Check harness between B-141 (terminal 
No. 5) ignition switch connector and B-105 
(terminal No. 1, 3) starter relay connector.

NOTE: Before checking harness, check intermediate 
connectors B-129, and repair if necessary.

.

•

Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 16 .

NO : 

Repair.

STEP 16. Check harness between B-105 (terminal 
No. 2) starter relay connector and B-60 (terminal 
No. 2) clutch switch connector.

NOTE: Before checking harness, check intermediate 
connector B-112, and repair if necessary.

.

•

Check power supply line for damage.

Q: Is the check result normal?

YES : 

Replace engine-ECU.

NO : 

Repair.

STEP 17. Connector check: A-124 starter 
connector

Q: Is the check result normal?

YES : 

Go to Step 18 .

NO : 

Repair or replace.

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK600404

2 1

AC

Connector: B-60

B-60

Harness side
connector

AK402056

1

Connector: A-124

A-124 Harness side 
connector

AC

A-124

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-251

STEP 18. Perform voltage measurement at A-124 
starter connector.

• Disconnect connector, and measure at the har-

ness side.

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 19 .

NO : 

Check and repair harness between battery 

and A-124 (terminal No.1) starter connector. 

• Check power supply line for 

open/short circuit.

STEP 19. Check harness between battery and 
A-124 (terminal No. 1) starter connector.

Q: Is the check result normal?

YES : 

Go to Step 20 .

NO : 

Repair.

STEP 20. Check harness between B-105 (terminal 
No. 4) starter relay connector and A-125 (terminal 
No. 1) starter connector.

NOTE: Before checking harness, check intermediate 
connectors B-109 and A-17, and repair if necessary.

.

•

Check output line for open circuit and damage.

Q: Is the check result normal?

YES : 

Replace starter.   

NO : 

Repair.

AK402056

1

Connector: A-124

A-124 Harness side 
connector

AC

A-124

AK402056

1

Connector: A-124

A-124 Harness side 
connector

AC

A-124

AK600403

3

2

1

4

AC

Connector: B-105

B-105

Harness side
connector

AK402055

1

Connector: A-125

A-125 Harness side
connector

AC

A-125 (B)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-252

Inspection Procedure 5: Starting Impossible (Starter Operative but No Initial Combustion)

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed ignition cir-

cuit, failed fuel feed or other faults.

PROBABLE CAUSES

• Failed battery

• Broken timing belt

• Throttle valve body fouled

• Failed ignition system

• Failed fuel system

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Perform voltage measurement during cranking.

OK: 8V or higher

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Check battery (Refer to GROUP 54A 

− 

Battery 

− On-vehicle Service − Battery Test 

P.54A-5

).

STEP 2. With M.U.T.-III of communication

• Confirm the communication available M.U.T.-III 

and engine-ECU.

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Check engine-ECU power source, engine 
control relay, and ignition switch IG1 system 
(Refer to Inspection Procedure 21 

P.13B-282

).

STEP 3. M.U.T.-III diagnosis code

Q: Is the diagnosis code output?

YES : 

Inspection chart for diagnosis codes (Refer 

to 

P.13B-18

).

NO : 

Go to Step 4 .

STEP 4. M.U.T.-III actuator test

• Item 07: Fuel pump

OK: There should be fuel pump operating 
sound.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Check fuel pump system (Refer to 
Inspection Procedure 22 

P.13B-290

).

STEP 5. Check timing belt for breakage.

• Engine: Cranking

OK: Camshaft rotates.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Replace timing belt.

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

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Clean throttle body (throttle valve) (Refer to 

P.13B-358

).

STEP 7. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13B-335

.

a. Item 18: Cranking signal

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Go to Step 8 .

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