Mitsubishi Grandis. Manual — part 717

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-119

STEP 10. Perform signal wave pattern
measurement at C-110 engine-ECU <M/T>
connector or engine-A/T-ECU <A/T> connector
(Using an oscilloscope).

• Engine: Idling

• Transmission: Neutral <M/T> or P range <A/T>

• Voltage between terminal No. 1 and earth.

OK: Waveforms should be display on
Inspection procedure using an oscilloscope
(Refer to

P.13A-378

).

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 engine-ECU <M/T> or
engine-A/T-ECU <A/T>.

AK305618AB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-120

Code No. P0202: No. 2 Injector System

AK305559

2

1

2

1

2

1

2

1

1

2

3

4

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

AB

B-15X

Engine
control
relay

Injector
No. 1

Injector
No. 2

J/C (4)

C-116

J/C (4)

C-116

Injector
No. 3

Injector
No. 4

B-105

(MU802062)

B-104

(MU802062)

B-102

(MU802062)

B-101

(MU802062)

1

1

1

1

17

18

19

1

9

11

22

2

2

2

2

2

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

1

5

14

21

C-110

(MU803802)

Injector circuit

W-G

W-G

R-W

R-W

R-W

R-W

R-W

R-W

R-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

Y

Y-L

Y-G

G-B

Battery

4

3

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-121

OPERATION

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

from the engine control relay (terminal No. 1).

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

<A/T> connector (terminal No. 5) makes the
power transistor 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-A/T-ECU

<A/T> controls the power supply interval of the
injector.

• The fuel injection amount of the injector depends

on the power supply interval.

TROUBLE JUDGMENT

Check Condition

• While engine is running.

Judgment Criterion

• Injector coil surge voltage (battery positive

voltage + 2 V) has not been detected for 2
seconds.

PROBABLE CAUSE

• Failed No. 2 injector

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

connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-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

P.00-5

).

NO :

Go to Step 2 .

STEP 2. Connector check: B-102 No. 2 injector
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace.

STEP 3. Check No. 2 injector itself.

• Check No. 2 Injector itself (Refer to

P.13A-393

).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace No. 2 injector.

STEP 4. Perform voltage measurement at B-102
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 .

AK300978

M

1

2

AK

B-102 (GR)

Harness side connector

Connector: B-102

AK300978

M

1

2

AK

B-102 (GR)

Harness side connector

Connector: B-102

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-122

STEP 5. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Check intermediate connector C-116, and

repair if necessary. If intermediate
connector is normal, check and repair
harness between B-15X (terminal No. 1)
engine control relay connector and B-102
(terminal No. 1) No. 2 injector connector.

• Check power supply line for

open/short circuit and damage.

NO :

Repair or replace.

STEP 6. Connector check: B-15X engine control
relay connector

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Repair or replace.

STEP 7. Check harness between B-15X (terminal
No. 1) engine control relay connector and B-102
(terminal No. 1) No. 2 injector connector.

NOTE: Before checking harness, check intermediate
connector C-116, and repair if necessary.

• Check power supply line for damage.

Q: Is the check result normal?

YES :

Go to Step 8 .

NO :

Repair.

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300978

M

1

2

AK

B-102 (GR)

Harness side connector

Connector: B-102

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300978

M

1

2

AK

B-102 (GR)

Harness side connector

Connector: B-102