Mitsubishi Colt Ralliart. Manual — part 35

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-94

Code No. P0202: No. 2 Injector System

AK402684

2

1

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

A-114

AK

B-106

A-17

B-112

B-108

Engine
control
relay

Injector
No. 2

A-103

(MU802062)

4

6

4

1

2

2

9

No. 2 Injector Circuit

R

R

Y-R

3

1

1

1

R

Fusible link

16

20A

J/B

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

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

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 Pu: Purple

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-95

OPERATION

• Power is supplied to the injector (terminal No. 1)

from the engine control relay (terminal No. 4).

• The engine-ECU connector or engine-CVT-ECU

connector (terminal No. 9) makes the power tran-
sistor in the unit be in ON position, and that
makes currents go on the injector (terminal No.
2).

FUNCTION

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

<CVT> controls the power supply interval of the
injector.

• The fuel injection amount of the injector depends

on the power supply interval.

TROUBLE JUDGMENT

Check Conditions

• Engine speed is between 50 and 1,000 r/min.

• Throttle position sensor (main) output is 1.0 V or

less.

• Injector operation (by carrying out actuator test)

is not in progress.

Judgment Criterion

• Injector coil surge voltage (battery positive volt-

age +2 V) has not been detected for 4 seconds.

PROBABLE CAUSES

• Failed No. 2 injector

• Open/short circuit in No. 2 injector circuit or loose

connector contact

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

<CVT>

DIAGNOSIS PROCEDURE

STEP 1. M.U.T.-III actuator test

• Item 02: No. 2 injector

OK: Idling state varies.

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-103 No. 2 injector
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace the connector.

STEP 3. Perform resistance measurement at
A-103 No. 2 injector connector.

• Disconnect connector, and measure at injector

side.

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

OK: 14

− 15 Ω (at 20°C)

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace No. 2 injector.

AK402148

M

1

2

A-103 (G)

Connector: A-103

AC

A-103 Harness side

connector

AK402165

1 2

A-103 (G)

Connector: A-103

AC

A-103 Equipment side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-96

STEP 4. Perform voltage measurement at A-103
No. 2 injector 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 connector A-17 and

B-112, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between B-106 (terminal
No. 4) engine control relay connector and
A-103 (terminal No. 1) No. 2 injector
connector.

• Check power supply line for

open/short circuit.

NO :

Repair or replace the connector.

AK402148

M

1

2

A-103 (G)

Connector: A-103

AC

A-103 Harness side

connector

3

2

1

4

AK402060

B-106
J/B side
connector

B-106

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

AC

AK402148

M

1

2

A-103 (G)

Connector: A-103

AC

A-103 Harness side

connector

Main

Index

Group

TOC

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI) <4A9>

13A-97

STEP 6. Connector check: A-114 engine-ECU
connector or engine-CVT-ECU connector

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Repair or replace the connector.

STEP 7. Check harness between B-106 (terminal
No. 4) engine control relay connector and A-103
(terminal No. 1) No. 2 injector connector.

NOTE: Before checking harness, check intermediate
connectors 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 8 .

NO :

Repair the damaged harness wire.

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

3

2

1

4

AK402060

B-106
J/B side
connector

B-106

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

AC

AK402148

M

1

2

A-103 (G)

Connector: A-103

AC

A-103 Harness side

connector

Main

Index

Group

TOC