Mitsubishi Grandis. Manual — part 731

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-175

YES :

Replace camshaft position sensor.

NO :

Intermittent malfunction (Refer to GROUP
00

− How to Use

Troubleshooting/Inspection Service Points

P.00-5

).

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-176

Code No. P0403: Exhaust Gas Recirculation Control System

1

2 3

4

5 6

1

2

3

4

1

2

3

5

6 7 8 9

4

20

21 22

232425

2627

10111213

14 15

16 1718

19

AK305563

W-G

W-G

Engine
control
relay

Battery

4

3

2

B-15X

2

5

3

12

19

26

1

3

4

6

Exhaust gas
recirculation
(EGR) valve

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

EGR valve circuit

B-103

(MU802056)

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

C-110

(MU803802)

AB

SB

L-Y

L-R

G-Y

1

11

9

J/C (4)

C-116

R-W

R-W

R-W

R-W

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

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-177

OPERATION

• Power is supplied to the EGR valve (terminal No.

2 and No. 5) from the engine control relay
(terminal No. 1).

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

<A/T> (terminal No. 3, No. 12, No. 19 and No. 26)
makes the power transistor in the unit be in "ON",
and that makes currents go on the EGR valve
(terminal No. 1, No. 3, No. 4 and No. 6).

FUNCTION

• Based on the signal from engine-ECU <M/T> or

engine-A/T-ECU <A/T>, the EGR valve (stepper
motor) controls the EGR rate.

TROUBLE JUDGMENT

Check Condition

• Battery positive voltage is 10.3 V or higher.

Judgment Criterion

• The EGR valve motor coil surge voltage (battery

positive voltage +2 V) is not detected for 3
seconds.

PROBABLE CAUSE

• Failed EGR valve

• Open/short circuit in EGR valve circuit or loose

connector contact

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-103 EGR valve
connector

Q: Is the check result normal?

YES :

Go to Step 2 .

NO :

Repair or replace.

STEP 2. Check EGR valve itself.

• Check EGR control solenoid valve itself [Refer to

GROUP 17

− Emission Control System −

Exhaust Gas Recirculation (EGR) System

− EGR

Valve (stepper motor) Check <4G69>

P.17-65

.

Q: Is the check result normal?

YES :

Go to Step 3 .

NO :

Replace EGR valve (stepper motor).

STEP 3. Perform voltage measurement at B-103
EGR valve connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 2, No. 5 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 5 .

NO :

Go to Step 4 .

AK300987

1

2

3

4

5

6

AC

Connector: B-103

B-103 (GR)

Harness side connector

AK300987

1

2

3

4

5

6

AC

Connector: B-103

B-103 (GR)

Harness side connector

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-178

STEP 4. 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-103 (terminal No. 2, No.
5) EGR valve connector and B-15X
(terminal No. 1) engine control relay
connector.

• Check power supply line for

open/short circuit.

NO :

Repair or replace.

STEP 5. Perform voltage measurement at C-110
engine-ECU connector or engine-A/T-ECU <A/T>
connector.

• Disconnect connector, and measure at harness

side.

• Ignition switch: ON

• Voltage between terminal No. 3, No. 12, No. 19,

No. 26 and earth.

OK: System voltage

Q: Is the check result normal?

YES :

Go to Step 7 .

NO :

Go to Step 6 .

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300987

1

2

3

4

5

6

AC

Connector: B-103

B-103 (GR)

Harness side connector

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