Mitsubishi Colt Ralliart. Manual - part 50

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-154

FUNCTION

• Based on the signal from engine-CVT-ECU, the 

EGR valve (stepper motor) controls the EGR 
rate.

TROUBLE JUDGMENT

Check Conditions

• When the ignition switch is turned to ON position 

from OFF position.

or

• EGR valve is in operation after the engine start-

ing process is completed.

Judgment Criterion

• Off-surge voltage is not generated from motor coil 

while the EGR valve motor is running.

PROBABLE CAUSES

• Failed EGR valve

• Open/short circuit in EGR valve circuit or loose 

connector contact

• Failed engine-CVT-ECU

DIAGNOSIS PROCEDURE

STEP 1. Connector check: A-109 EGR valve 
connector

Q: Is the check result normal?

YES : 

Go to Step 2 .

NO : 

Repair or replace the connector.

STEP 2. Perform resistance measurement at 
A-109 EGR valve connector.

• Disconnect connector, and measure at harness 

side.

• Resistance between terminal No. 1 and No. 2.

• Resistance between terminal No. 2 and No. 3.

• Resistance between terminal No. 4 and No. 5.

• Resistance between terminal No. 5 and No. 6.

OK: 20 

− 24 Ω (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Replace EGR valve.

STEP 3. Perform voltage measurement at A-109 
EGR valve connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 2, No. 5 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Go to Step 4 .

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 Harness side

connector

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 Harness side

connector

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-155

STEP 4. Connector check: B-106 engine control 
relay connector

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-109 (terminal 
No. 2, No. 5) EGR valve 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. Connector check: A-114 
engine-CVT-ECU connector

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair or replace the connector.

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 Harness side

connector

AK402745

6

4

2

5

3

1

9

7

8

10

11

12

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14

15

16

17

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52

53

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62

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66

L

AB

A-114

Connector: 

A-114

Harness side connector

Engine-CVT-ECU

Battery

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-156

STEP 6. Check harness between A-109 EGR 
valve connector and A-114 engine-CVT-ECU 
connector.

a. Check harness between A-109 (terminal No. 1) 

EGR valve and A-114 (terminal No. 5) 
engine-CVT-ECU connector.

b. Check harness between A-109 (terminal No. 3) 

EGR valve and A-114 (terminal No. 6) 
engine-CVT-ECU connector.

c. Check harness between A-109 (terminal No. 4) 

EGR valve and A-114 (terminal No. 53) 
engine-CVT-ECU connector.

d. Check harness between A-109 (terminal No. 6) 

EGR valve and A-114 (terminal No. 54) 
engine-CVT-ECU connector.

• Check output line for open/short circuit and dam-

age.

Q: Are the check results normal?

YES : 

Go to Step 7 .

NO : 

Repair the damaged harness wire.

STEP 7. Connector check: B-106 engine control 
relay connector

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Repair or replace the connector.

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 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

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48

49

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51

52

53

54

55

56

57

58

59

60

61

62

63

64

65

66

L

AB

A-114

Connector: 

A-114

Harness side connector

Engine-CVT-ECU

Battery

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-157

STEP 8. Check harness between A-109 (terminal 
No. 2, No. 5) EGR valve connector and B-106 
(terminal No. 4) engine control relay connector.

NOTE: Before checking harness, check intermediate 
connector A-17 and B-112, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair the damaged harness wire.

STEP 9. M.U.T.-III diagnosis code

• Reconfirmation of diagnosis code.

Q: Is the diagnosis code set?

YES : 

Replace engine-CVT-ECU.

NO : 

Intermittent malfunction (Refer to GROUP 
00 

− How to Use Troubleshooting/Inspection 

Service Points 

− How to Cope with 

Intermittent Malfunctions 

P.00-13

).

AK402008

3

2 1

6

5 4

AC

Connector: A-109

A-109 (G)

A-109 Harness side

connector

3

2

1

4

AK402060

B-106
J/B side 
connector

B-106

Connector: B-106
J/B (front side)

AC

Main

Index

Group

TOC