Mitsubishi Grandis. Manual - part 715

 

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Mitsubishi Grandis. Manual - part 715

 

 

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-111

STEP 12. Check purge control solenoid valve 
itself.

• Check purge control solenoid valve itself (Refer 

to GROUP 17 

− Emission Control System − 

Evaporative Emission Control System

− Purge 

Control Solenoid Valve 

P.17-62

).

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Replace purge control solenoid valve.

STEP 13. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel 

Pressure Test 

P.13A-383

).

Q: Is the check result normal?

YES : 

Replace engine-ECU <M/T> or 

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

NO : 

Repair.

Code No. P0173: Abnormal Fuel System (cylinder 2, 3)

OPERATION

• Refer to Code No. P0202 No. 2 Injector System 

P.13A-120

.

• Refer to Code No. P0203 No. 3 Injector System 

P.13A-125

.

FUNCTION

• If the fuel system goes out of order, the fuel 

correction value will become larger.

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

<A/T> checks whether the fuel trim value is within 
a specified range.

TROUBLE JUDGMENT

Check Condition

• In learning the air-fuel ratio

Judgment Criteria

• Long-term fuel trim has continued to be +12.5 % 

or higher for 10 seconds.

Or

• Long-term fuel trim has continued to be -12.5 % 

or lower for 10 seconds.

PROBABLE CAUSE

• Failed intake air temperature sensor

• Failed air flow sensor

• Failed purge control solenoid valve

• Failed injector

• Air drawn in from gaps in gasket, seals, etc.

• Failed engine coolant temperature sensor

• Failed barometric pressure sensor

• Exhaust leak

• Incorrect fuel pressure

• Failed engine-ECU <M/T>

• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE

STEP 1. MUT-III diagnosis code

Q: Is any other diagnosis code than P0173 output?

YES : 

Inspection chart for diagnosis code (Refer 

to 

P.13A-20

).

NO : 

Go to Step 2 .

STEP 2. MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 12: Air flow sensor
b. Item 13: Intake air temperature sensor

c. Item 21: Engine coolant temperature sensor

Q: Are the check results normal?

YES : 

Go to Step 3 .

NO : 

Perform the diagnosis code classified check 
procedure for the sensor that has shown an 
abnormal data value (Refer to Inspection 
Chart for Diagnosis Code 

P.13A-20

).

STEP 3: MUT-III data list

• Refer to Data List Reference Table 

P.13A-363

.

a. Item 25: Barometric pressure sensor

Q: Is the check result normal?

YES : 

Go to Step 4 .

NO : 

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

STEP 4. Check throttle body (throttle valve 
portion) for contamination.

Q: Is the check result normal?

YES : 

Go to Step 5 .

NO : 

Clean throttle body (throttle valve portion) 
(Refer to 

P.13A-383

).

TROUBLESHOOTING

MULTIPORT FUEL INJECTION (MPI)

13A-112

STEP 5. Check for intake of air from intake hose 
and inlet manifold.

Q: Is the check result normal?

YES : 

Go to Step 6 .

NO : 

Repair.

STEP 6. Check for leakage of exhaust emission 
from exhaust manifold.

Q: Is the check result normal?

YES : 

Go to Step 7 .

NO : 

Repair.

STEP 7. Connector Check: Injector connector

a. B-102 (No. 2 injector connector).
b. B-104 (No. 3 injector connector).

Q: Are the check results normal?

YES : 

Go to Step 8 .

NO : 

Repair or replace.

STEP 8. Check No.2 and No.3 injector itself.

• Check No.2 and No.3 Injector itself (Refer to 

P.13A-393

).

Q: Is the check result normal?

YES : 

Go to Step 9 .

NO : 

Replace injector.

STEP 9. Connector check: B-15X engine control 
relay connector and 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 10 .

NO : 

Repair or replace.

AK300978

M

1

2

B-102 (GR)

B-104 (GR)

AI

Harness side connector

Connectors: B-102, B-104

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

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-113

STEP 10. Check harness between B-15X engine 
control relay connector and injector connector.

a. Check intermediate connector C-116, and repair 

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

b. Check intermediate connector C-116, and repair 

if necessary. If intermediate connector is normal, 
check harness between B-15X (terminal No. 1) 
engine control relay connector and B-104 
(terminal No. 1) No. 3 injector connector.

• Check power supply line for damage.

Q: Are the check results normal?

YES : 

Go to Step 11 .

NO : 

Repair or replace.

STEP 11. Check harness between injector 
connector and C-110 engine-ECU <M/T> 
connector or engine-A/T-ECU <A/T> connector.

a. 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.

b. Check harness between B-104 (terminal No. 2) 

No. 3 injector connector and C-110 (terminal No. 
14) engine-ECU <M/T> connector or 
engine-A/T-ECU <A/T> connector.

Q: Are the check results normal?

YES : 

Go to Step 12 .

NO : 

Repair.

AK300978

M

1

2

B-102 (GR)

B-104 (GR)

AI

Harness side connector

Connectors: B-102, B-104

AK300967

2

1

3

4

AC

Harness side
connector

B-15X

Connector: B-15X

Relay box’s
triangle marks

AK300978

M

1

2

B-102 (GR)

B-104 (GR)

AI

Harness side connector

Connectors: B-102, B-104

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-114

STEP 12. Check purge control solenoid valve 
itself.

• Check purge control solenoid valve itself (Refer 

to GROUP 17 

− Emission Control System − 

Evaporative Emission Control System 

− Purge 

Control Solenoid Valve 

P.17-62

).

Q: Is the check result normal?

YES : 

Go to Step 13 .

NO : 

Replace purge control solenoid valve.

STEP 13. Fuel pressure measurement.

• Fuel pressure measurement (Refer to Fuel 

Pressure Test 

P.13A-383

).

Q: Is the check result normal?

YES : 

Replace engine-ECU <M/T> or 

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

NO : 

Repair.

 

 

 

 

 

 

 

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