Mitsubishi Lancer Evolution IX. Manual - part 414

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-131

Judgment Criterion

• Surge voltage cannot be detected within 1 sec-

onds from the time when the waste gate solenoid 
valve has changed from ON to OFF.

PROBABLE CAUSES

• Failed waste gate solenoid valve

• Open/short circuit in waste gate solenoid valve 

sensor circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-II/III actuator test

• Item No. 12: Waste gate solenoid valve

OK: Operating sound can be heard and the 
valve vibrates.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Go to Step 2 .

STEP 2. Connector check: B-26 waste gate 
solenoid valve connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace the connector.

STEP 3. Perform resistance measurement at B-26 
waste gate solenoid valve connector.

• Disconnect connector, and measure at solenoid 

valve side.

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

OK: 29 

− 35 Ω (at 20°C)

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

Replace the waste gate solenoid valve.

STEP 4. Perform voltage measurement at B-26 
waste gate solenoid valve connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal No. 1 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Go to Step 5 .

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-132

STEP 5. Connector check: B-12X engine control 
relay connector

Q: Is the check result normal?

YES : 

Check and repair harness between B-26 

(terminal No. 1) waste gate solenoid valve 
connector and B-12X (terminal No. 4) 
engine control relay connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace the connector.

STEP 6. Perform voltage measurement at C-119 
engine-ECU connector.

• Disconnect connector, and measure at harness 

side.

• Ignition switch: "ON"

• Voltage between terminal No. 41 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 7 .

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-133

STEP 7. Connector check: C-119 engine-ECU 
connector 

Q: Is the check result normal?

YES : 

Check and repair harness between B-26 

(terminal No. 2) waste gate solenoid valve 
connector and C-119 (terminal No. 41) 
engine-ECU connector.

• Check output line for open/short 

circuit.

NO : 

Repair or replace the connector.

STEP 8. Connector check: C-119 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Repair or replace the connector.

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-134

STEP 9. Check harness between B-26 (terminal 
No. 2) waste gate solenoid valve connector and 
C-119 (terminal No. 41) 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. Check harness between B-26 (terminal 
No. 1) waste gate solenoid valve connector and 
B-12X (terminal No. 4) engine control relay 
connector.

• Check power supply line for damage.

Q: Is the check result normal?

YES : 

Go to Step 11 .

NO : 

Repair the damaged harness wire.

STEP 11. M.U.T.-II/III actuator test

• Item No. 12: Waste gate solenoid valve

OK: Operating sound can be heard and the 
valve vibrates.

Q: Is the check result normal?

YES : 

Intermittent malfunction (Refer to GROUP 

00 

− How to Use 

Troubleshooting/Inspection Service Points 

P.00-5

).

NO : 

Replace the engine-ECU.

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

AK501994

65

43
50

42
49

41
48
60

61

64

46

47

58

59

67

68

45

56
66

52 51

44

53

62

54

63

57

55

AB

Connector: C-119

C-119 (GR)

C-119 (GR)

Harness side connector

<L. H. drive vehicles>

<R. H. drive vehicles>

1

2

AK305018

Connector : B-26

Harness side 
connector

B-26(GR)

AB

AK305003

2

1

3

4

AB

Connector : B-12X

B-12X

Harness side 
connector

Relay box’s
triangle marks