Mitsubishi Eclipse. Manual - part 600

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-943

STEP 9. Check connector B-01 or B-05 or B-26 at right 
bank injector for damage.
(1) Check the injector connector, which deviated from the 

standard value listed in Step 7.

Q: Is the 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 10. Check connector B-48 at the injector 
intermediate connector for damage.
Q: Is the connector in good condition?

YES : Go to Step 11.
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 connector B-02, B-06, B-25 at the left bank 
injector for damage.
Q: Is the 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.

AK300752

1

2

CONNECTORS: B-01, B-05, B-26

AB

B-05 (GR) B-26 (GR)

B-01 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300751

1

2

3

4

CONNECTOR: B-48

AB

B-48 (B)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300753

1

2

CONNECTORS: B-02, B-06, B-25

AB

B-02 (GR)

B-06 (GR) B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-944

STEP 12. Check the connector C-51 at the ECM <M/T> or 
connector C-52 at the PCM <A/T> for damage.
Q: Is the 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.

AK300458

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3

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5

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8

9

11

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30

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24

25

26

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35

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10

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

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8

9

11

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30

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25

26

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35

1

10

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-945

STEP 13. Check for harness damage between injector 
connector and ECM connector <M/T> or PCM connector 
<A/T>.

a. Check the harness wire between injector connector 

B-01 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 1) <M/T> or PCM connector C-52 (terminal No. 
1) <A/T> when checking No. 1 cylinder injector.

b. Check the harness wire between injector connector 

B-02 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 9) <M/T> or PCM connector C-52 (terminal No. 
9) <A/T> when checking No. 2 cylinder injector.

c. Check the harness wire between injector connector 

B-05 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 24) <M/T> or PCM connector C-52 (terminal No. 
24) <A/T> when checking No. 3 cylinder injector.

d. Check the harness wire between injector connector 

B-06 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 2) <M/T> or PCM connector C-52 (terminal No. 
2) <A/T> when checking No. 4 cylinder injector.

e. Check the harness wire between injector connector 

B-26 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 10) <M/T> or PCM connector C-52 (terminal No. 
10) <A/T> when checking No. 5 cylinder injector.

f. Check the harness wire between injector connector 

B-25 (terminal No. 2) and ECM connector C-51 (termi-
nal No. 25) <M/T> or PCM connector C-52 (terminal No. 
25) <A/T> when checking 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, spark plugs, spark plug 

cables.

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.

AK300754

1

2

CONNECTORS: B-01, B-02, B-05, B-06, 
                            B-25, B-26

AB

B-01 (GR)

B-05 (GR)

B-26 (GR)

B-02 (GR)

B-06 (GR)

B-25 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300458

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8

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11

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30

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25

26

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32

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35

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10

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300443

2

3

4

5

6

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8

9

11

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19

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30

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25

26

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32

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35

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10

CONNECTOR: C-51 <M/T>

C-51 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-946

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 idle air control motor. 
Other systems affecting idle quality include the 
ignition system and compression.

.

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

• Malfunction of the ignition system.

• Malfunction of air/fuel ratio control system.

• Malfunction of the IAC system.

• Malfunction of the evaporative emission purge 

solenoid system.

• Poor compression pressure.

• Vacuum leak.

• Malfunction of the EGR vacuum regulator sole-

noid valve system.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

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.

STEP 2. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch is to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 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 DTC set?

YES : Refer to, Diagnostic Trouble Code Chart 

P.13B-23

.

NO :  Go to Step 3.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824