Mitsubishi 380. Manual - part 618

 

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Mitsubishi 380. Manual - part 618

 

 

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-564

STEP 10. Check harness connector B-03 or B-04 or B-01 at 
right bank injector for damage.
(1) Check the injector connector, which deviated from the 

standard value listed in Step 8. 

Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate 

connector and right bank injector connector because 
of harness damage. Then confirm that the 
malfunction symptom is eliminated.

NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 11. Check harness connector B-32 at the 
intermediate connector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 12.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 12. Check harness connector B-27, B-26, B-30 at the 
left bank injector for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 13.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

AK303055

M

1

2

CONNECTOR: B-01, B-03, B-04

AB

B-01 (GR)

B-03 (GR)

B-04 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AK303053

3

4

5

8

9

1

2

6

7

10

CONNECTOR: B-32

HARNESS CONNECTOR:

COMPONENT SIDE

AB

B-32 (B)

AK303075

M

1

2

CONNECTOR: B-26, B-27, B-30

B-30 (GR)

B-27 (GR)

B-26 (GR)

HARNESS CONNECTOR:

COMPONENT SIDE

AB

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-565

STEP 13. Check the harness connector B-20 at the 
ENGINE-ECU for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 14.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then confirm that the 

malfunction symptom is eliminated.

STEP 14. Check for harness damage between injector 
connector and ENGINE-ECU connector.

a. Check the harness wire between injector connector 

B-01 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 03) at No. 1 cylinder injector.

b. Check the harness wire between injector connector 

B-30 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 04) at No. 2 cylinder injector.

c. Check the harness wire between injector connector 

B-03 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 34) at No. 3 cylinder injector.

d. Check the harness wire between injector connector 

B-27 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 35) at No. 4 cylinder injector.

e. Check the harness wire between injector connector 

B-04 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 16) at No. 5 cylinder injector.

f. Check the harness wire between injector connector 

B-26 (terminal No. 2) and ENGINE-ECU connector B-20 
(terminal No. 17) at No. 6 cylinder injector.

Q: Is the harness wire in good condition?

YES : Check the following items, and repair or replace the 

defective items.

a. Check the ignition coil and spark plugs.
b. Check if the injectors are clogged.

c. Check the compression pressure.

d. Check if the foreign materials (water, 

kerosene, etc.) got into fuel.

Then confirm that the malfunction symptom is 

eliminated.

NO :  Repair it. Then confirm that the malfunction symptom 

is eliminated.

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

AK303235

M

1

2

AB

B-30 (GR)

B-04 (GR)

B-01 (GR)

B-27 (GR)

B-03 (GR)

B-26 (GR)

CONNECTOR: B-01, B-03, B-04, B-26,B-27,

                         B-30

HARNESS CONNECTOR:

COMPONENT SIDE

16DB400A

COVER

ENGINE

CONTROL

UNIT

AIR

CLEANER

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-566

STEP 15. Check injector is insulated from earth.
(1) Measure the resistance between each injector housing and 

earth.

Q: Is there no continuity?

YES : ok.
NO :  Repair or replace injector. Then confirm that the 

malfunction symptom is eliminated.

INSPECTION PROCEDURE 8: Unstable Idle (Rough Idle, Hunting).

.

COMMENT

• In cases such as the above, the cause is proba-

bly the air/fuel mixture or electronic control throt-
tle valve system. Other systems affecting idle 
quality include the ignition system and compres-
sion.

.

TROUBLESHOOTING HINTS (The most 
likely causes for this case:)

• Malfunction of the ignition system.

• Malfunction of air/fuel ratio control system.

• Malfunction of the electronic control throttle valve 

system.

• Malfunction of the evaporative emission purge 

solenoid system.

• Poor compression pressure.

• Vacuum leak.

• Refer to component locations GROUP-

70

• Refer to configuration diagrams GROUP-

80

• Refer to circuit diagrams GROUP-

90

DIAGNOSIS

Required Special Tools:

• : Diagnostic Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Check if the battery terminal is disconnected

Q: Has the battery terminal been disconnected lately?

YES : Start the engine and let it run at idle for approximate 

10 minutes after engine warm up. Then, if a 
malfunction occurs, go to Step 2.

NO :  Go to Step 2.

03DB230A

INJECTOR 
HOUSING

MULTIPORT FUEL INJECTION (MPI) DIAG

MULTIPORT FUEL INJECTION (MPI)

13A-567

STEP 2. Using diagnostic tool , read the diagnostic trouble 
code (DTC).

CAUTION

To prevent damage to diagnostic tool , always turn the 
ignition switch is to the "LOCK" (OFF) position before con-
necting or disconnecting diagnostic tool .
(1) Connect diagnostic tool to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart 

P.13A-17

.

NO :  Go to Step 3.

STEP 3. Check the engine idling state.

Q: Is it noticeably hunting?

YES : Go to Step 4.
NO :  Go to Step 5.

STEP 4. Check the following items.
(1) Carry out the following cleaning.

a. Refer to On-vehicle Service 

− Clean the throttle valve 

area 

P.13A-660

.

(2) After cleaning, confirm that the malfunction symptom is 

eliminated.

Q: Is the malfunction symptom resolved?

YES : The check is completed.
NO :  Check the following items, and repair or replace the 

defective items.

a. Broken intake manifold gasket.
b. Broken air intake hose.

c. Broken vacuum hose.

d. Positive crankcase ventilation valve does not 

operate.

Then confirm that the malfunction symptom is 

eliminated.

00DB076A

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

 

 

 

 

 

 

 

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