Mitsubishi Colt Ralliart. Manual - part 675

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-25

Code No. P0090: Fuel Pressure control Solenoid Valve System

AK402717

3

1

2

4

19

21

20

18

17

16

15

14

1213

11

8 9

L

10

37
52 53 54 555657585960616263646566

38 39 404142434445464748495051

22 23 24 252627282930313233343536

7

5

3

1

6

4

2

1 2

Fuel pressure solenoid valve

1

2

57

Engine-ECU

G-W

Wire colour code
B: Black  LG: Light green  G: Green  L: Blue  W: White  Y: Yellow  SB: Sky blue  BR: Brown  O: Orange  GR: Gray
R: Red  P: Pink  V: Violet

AE

Fuel Pressure Solenoid Valve Circuit

J/B

Engine
control
relay

4

2

3

1

6

4

To engine-ECU

R

R

B-106

B-112

A-17

1

1

R

Fusible link

16

20A

B-108

A-114

     A-136   
(MU802722)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-26

OPERATION

• Power is supplied to the fuel pressure control 

solenoid valve (terminal No. 1) from the engine 
relay (terminal No. 4).

• The engine-ECU (terminal No. 57) makes the 

power transistor in the unit be in ON position, and 
that makes currents go to the fuel pressure con-
trol solenoid valve (terminal No. 2).

FUNCTION

• In response to a signal from the engine-ECU, the 

fuel pressure control solenoid valve switches the 
introduction pressure into the fuel pressure regu-
lator between negative pressure of the intake 
manifold and barometric pressure.

TROUBLE JUDGMENT 

Check Condition

• While engine running

• Battery voltage is more than 10 V and is less than 

16 V.

Judgement Criterion

• Surge voltage cannot be detected within the time 

when the fuel pressure solenoid valve has 
changed from ON to OFF.

PROBABLE CAUSES

• Failed fuel pressure control solenoid valve

• Open/short circuit in fuel pressure control sole-

noid valve circuit or loose connector contact

• Failed engine-ECU

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

• Item 09: Fuel pressure control 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 

− 

How to Cope with Intermittent Malfunctions 

P.00-13

).

NO : 

Go to Step 2 .

STEP 2. Connector check: A-136 fuel pressure 
control solenoid valve connector

Q: Is the check result normal?

YES : 

Go to Step 3 .

NO : 

Repair or replace.

STEP 3. Perform resistance measurement at 
A-136 fuel pressure control solenoid valve 
connector.

• Disconnect connector, and measure at solenoid 

valve side.

• Resistance between Terminals 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 fuel pressure control solenoid 
valve.

AK402120

1

2

AC

Connector: A-136

Harness side 
connector

A-136(B)

AK402120

1

2

AC

Connector: A-136

Harness side 
connector

A-136(B)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-27

STEP 4. Perform voltage measurement at A-136 
fuel pressure control 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 .

STEP 5. Connector check: B-106 engine control 
relay connector

Q: Is the check result normal?

YES : 

Check intermediate connectors A-17 and 

B-112, and repair if necessary. If 
intermediate connectors are normal, check 
and repair harness between A-136 (terminal 
No. 1) fuel pressure control solenoid valve 
connector and B-106 (terminal No. 4) 
engine control relay connector.

• Check power supply line for 

open/short circuit.

NO : 

Repair or replace.

AK402120

1

2

AC

Connector: A-136

Harness side 
connector

A-136(B)

3

2

1

4

AK402084

J/B side 
connector

B-106

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

AC

AK402120

1

2

AC

Connector: A-136

Harness side 
connector

A-136(B)

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4G1>

13B-28

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

• Disconnect connector and measure at harness 

side.

• Ignition switch: ON

• Voltage between terminal No. 57 and earth.

OK: System voltage

Q: Is the check result normal?

YES : 

Go to Step 8 .

NO : 

Go to Step 7 .

STEP 7. Connector check: A-114 engine-ECU 
connector

Q: Is the check result normal?

YES : 

Check and repair harness between A-136 

(terminal No. 2) fuel pressure solenoid valve 
connector and A-114 (terminal No. 57) 
engine-ECU connector.

• Check output line for open/short 

circuit.

NO : 

Repair or replace.

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

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

AK402120

1

2

AC

Connector: A-136

Harness side 
connector

A-136(B)

Main

Index

Group

TOC