Mitsubishi Eclipse. Manual - part 318

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-765

STEP 10. Check connector C-49 at ECM <M/T> or 
connector C-50 at PCM <A/T> 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.

AK300413

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14

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22

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16

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26

24

25

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10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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10

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-766

STEP 11. Check for harness damage between injector 
connector and ECM <M/T> or PCM <A/T> connector.

a. Check the harness wire between injector connector B-01 

(terminal No. 2) and ECM connector C-49 (terminal No. 1) 
<M/T> or PCM connector C-50 (terminal No. 1) <A/T> when 
checking No. 1 cylinder.

b. Check the harness wire between injector connector B-02 

(terminal No. 2) and ECM connector C-49 (terminal No. 14) 
<M/T> or PCM connector C-50 (terminal No. 9) <A/T> when 
checking No. 2 cylinder.

c. Check the harness wire between injector connector B-05 

(terminal No. 2) and ECM connector C-49 (terminal No. 2) 
<M/T> or PCM connector C-50 (terminal No. 24) <A/T> 
when checking No. 3 cylinder.

d. Check the harness wire between injector connector B-06 

(terminal No. 2) and ECM connector C-49 (terminal No. 15) 
<M/T> or PCM connector C-50 (terminal No. 2) <A/T> when 
checking No. 4 cylinder.

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 compression pressure.

d. Check fuel lines for clogging.
e. 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.

AK300737

1

2

CONNECTORS: B-01, B-02, B-05, B-06

AB

B-02 (GR)

B-01 (GR)

B-05 (GR)

B-06 (GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK300413

1

14

4

19

5

22

6

17

8

15

9

18

7

20

16

2

21

23

26

24

25

3

10

11

12

13

CONNECTOR: C-49 <M/T>

C-49 (G)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

AK300414

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30

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35

1

10

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-767

INSPECTION PROCEDURE 7: Hard Starting

.

COMMENT

• In cases such as the above, the cause is usually 

either weak spark, improper air-fuel mixture or 
low compression.

.

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

• Malfunction of the ignition system.

• Malfunction of the injector system.

• Poor fuel quality. (Contamination)

• Poor compression.

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Measure the battery positive voltage.
(1) Measure the battery positive voltage during cranking.

• The voltage is 8 volts or more.

Q: Is the voltage normal?

YES : Go to Step 2.
NO :  Refer to GROUP 54A, Battery 

− Battery Check 

P.54A-5

.

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 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.13A-24

. 

NO :  Go to Step 3.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-768

STEP 3. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to 

Actuator Test Reference Table 

P.13A-903

.

a. Item 07: Fuel Pump.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

YES : Go to Step 4.
NO :  Repair or Replace. Then confirm that the malfunction 

symptom is eliminated.

STEP 4. Using scan tool MB991958, check data list.
(1) Turn the ignition switch the "ON" position.
(2) Check the following items in the data list. Refer to Data List 

Reference Table 

P.13A-892

.

a. Item 21: Engine Coolant Temperature Sensor.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : Go to Step 5.
NO :  Repair or Replace. Then confirm that the malfunction 

symptom is eliminated.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300810

AB

MB991911

16-PIN

MB991827

MB991824