Mitsubishi Grandis. Manual — part 718

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-123

STEP 8. Connector check: C-110 engine-ECU
<M/T> connector or engine-A/T-ECU <A/T>
connector

Q: Is the check result normal?

YES :

Go to Step 9 .

NO :

Repair or replace.

STEP 9. Check harness between B-102 (terminal
No. 2) No. 2 injector connector and C-110
(terminal No. 5) engine-ECU <M/T> connector or
engine-A/T-ECU <A/T> connector.

• Check output line for open/short circuit and

damage.

Q: Is the check result normal?

YES :

Go to Step 10 .

NO :

Repair.

AK305618AB

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Connector: C-110

<L.H. drive vehicles>

<R.H. drive vehicles>

C-110 (GR)

C-110 (GR)

Harness side connector

AK300978

M

1

2

AK

B-102 (GR)

Harness side connector

Connector: B-102

AK305618AB

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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-124

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. 5 and earth.

OK: Waveform 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

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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-125

Code No. P0203: No. 3 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-126

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> (terminal No. 14) 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. 3 injector

• Open/short circuit in No. 3 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 03: No. 3 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-104 No. 3 injector
connector

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Repair or replace.

STEP 3. Check No. 3 injector itself.

• Check No. 3 Injector itself (Refer to

P.13A-393

).

Q: Is the check result normal?

YES :

Go to Step 4 .

NO :

Replace No. 3 injector.

STEP 4. Perform voltage measurement at B-104
No. 3 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

Connector: B-104

B-104 (GR)

AK300978AL

Harness side connector

AK300978

M

1

2

Connector: B-104

B-104 (GR)

AK300978AL

Harness side connector