Mitsubishi Colt Ralliart. Manual - part 79

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-270

STEP 8. M.U.T.-III data list

• Refer to Data List Reference Table 

P.13A-331

.

a. Item 11: Oxygen sensor (front)
b. Item 59: Oxygen sensor (rear)

Q: Are the check results normal?

YES : 

Go to Step 9 .

NO : 

Perform the diagnosis code classified check 
Procedure for the sensor that has shown an 
abnormal data value (Refer to Inspection 
Chart for Diagnosis Code 

P.13A-20

).

STEP 9. Check purge control solenoid valve 
itself.

• Check purge control solenoid valve itself (Refer 

to GROUP 17 

− Emission Control System − 

Evaporative Emission Control System 

− Purge 

Control Solenoid Valve Check 

P.17-16

).

Q: Is the check result normal?

YES : 

Go to Step 10 <CVT> , go to Step 11 <M/T> 

.

NO : 

Replace purge control solenoid valve.

 STEP 10. Check EGR valve (stepper motor) 
itself.

• Check EGR valve (stepper motor) itself [Refer to 

GROUP 17 

− Emission Control System − 

Exhaust Gas Recirculation (EGR) System 

− EGR 

Valve (Stepper Motor) Check 

P.17-20

].

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Replace EGR valve (stepper motor).

STEP 11. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel Pres-

sure Test 

P.13A-355

).

Q: Is the check result normal?

YES : 

Go to Step 12 .

NO : 

Repair.

STEP 12. Check positive crankcase ventilation 
valve itself.

• Check positive crankcase ventilation valve itself 

(Refer to GROUP 17 

− Emission Control System 

− crankcase Emission Control System − Positive 
Crankcase Ventilation (PCV) Valve Check 

P.17-13

).

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Replace positive crankcase ventilation 
valve.

STEP 13. Check spark plug.

• Check spark plug (Refer to GROUP 16 − Ignition 

System 

− On-vehicle Service − Spark Plug Check 

and Cleaning 

P.16-35

).

Q: Is the check result normal?

YES : 

Go to Step 14 .

NO : 

Replace spark plug.

STEP 14. Check compression pressure.

• Check compression pressure (Refer to GROUP 

11A 

− On-vehicle Service − Compression Pres-

sure Check 

P.11A-12

).

Q: Is the check result normal?

YES : 

Go to Step 15 .

NO : 

Repair.

STEP 15. Check injector for spraying condition.

• Check each injector for spray condition (Refer to 

P.13A-364

).

Q: Does trouble symptom persist?

YES : 

Go to Step 16 .

NO : 

Replace injector.

STEP 16. Replace catalytic converter.

• After replacing the catalytic converter, re-check 

the trouble symptoms.

Q: Does trouble symptom persist?

YES : 

Replace engine-ECU <M/T> or 

engine-CVT-ECU <CVT>.

NO : 

Check end

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-271

Inspection Procedure 19: Battery run down

COMMENT ON TROUBLE SYMPTOM

• Failure is possibly caused by failed alternator, 

failed generation control circuit or other faults.

PROBABLE CAUSES

• Failed battery

• Alternator G terminal short-circuited

• Failed alternator

• Failed engine-ECU <M/T> or engine-CVT-ECU 

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. Check battery voltage.

• Measure battery voltage during cranking.

OK: 8 V or more

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. Connector check: A-131 alternator 
connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform voltage measurement at A-131 
alternator 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-141 ignition switch 
connector

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side 
connector

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side 
connector

AK402054

B-141

AC

Connector: B-141

1

2

3

4

5

6

B-141 Harness
side connector

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 Harness side 
connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-272

Q: Is the check result normal?

YES : 

Check intermediate connectors A-17, B-14, 

B-41, B-22, B-131, B-129, and repair if 
necessary. If intermediate connectors are 
normal, check and repair harness between 
A-131 (terminal No. 3) alternator connector 
and B-141 (terminal No. 2) ignition switch 
connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

STEP 5. Connector check: A-114 engine-ECU 
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

STEP 6. Perform voltage measurement at A-114 
engine-ECU connector or engine-CVT-ECU 
connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 64 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 7 .

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

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

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

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-273

STEP 7. Check harness between A-114 (terminal 
No. 64) engine-ECU connector or 
engine-CVT-ECU connector and A-131 (terminal 
No. 1) alternator connector.

• Check output line for open/short circuit.

Q: Is the check result normal?

YES : 

Replace alternator.

NO : 

Repair the damaged harness wire.

STEP 8. Perform voltage measurement at A-114 
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.

• Engine: Idling after warm-up

• Transmission: P range

• Radiator fan: Inactive

• Voltage between terminal No. 64 and earth.

OK: Switching the headlamps to ON from 
OFF causes the voltage to increase 0.2 

− 3.5 

V.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Replace alternator.

STEP 9. Check the trouble symptoms.

Q: Does trouble symptom persist?

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 

P.00-13

).

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

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

AK402057

2 1

3

4

AC

Connector: A-131

A-131 (G)

A-131 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

AD

A-114

Connector: 

A-114

Harness side connector

Engine-ECU <M/T> or
engine-CVT-ECU <CVT>

Battery

Main

Index

Group

TOC