Mitsubishi Eclipse. Manual - part 250

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-493

DIAGNOSIS

Required Special Tools:

• MB991958 (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

STEP 1. Using scan tool MB991958, check actuator test 
item 08: Evaporative Emission Purge Solenoid.

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) Set scan tool MB991958 to the actuator test mode for item 

08, Evaporative emission purge solenoid.

• An operation sound should be heard and vibration 

should be felt when the evaporative emission purge 
solenoid is operated.

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

YES : It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

NO :  Go to Step 2.

STEP 2. Check connector B-33 at the evaporative emission 
purge solenoid for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK300810

AB

MB991911

16-PIN

MB991827

MB991824 

AK300407

1

2

AB

B-33 (B)

CONNECTOR: B-33

HARNESS 
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-494

STEP 3. Check the evaporative emission purge solenoid.
(1) Disconnect the evaporative emission purge solenoid 

connector B-33.

(2) Measure the resistance between evaporative emission 

purge solenoid side connector terminal No. 1 and No. 2.

Standard value: 30 

− 34 ohms [at 20°C (68°F)]

Q: Is the resistance between 30 and 34 ohms?

YES : Go to Step 4.
NO :  Replace the evaporative emission purge solenoid. 

Then go to Step 12.

STEP 4. Measure the power supply voltage at evaporative 
emission purge solenoid harness side connector B-33.
(1) Disconnect the connector B-33 and measure at the harness 

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 2 and ground.

• Voltage should be battery positive voltage.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 6.
NO :  Go to Step 5.

AK300407

1

2

AB

B-33 (B)

CONNECTOR: B-33

HARNESS 
CONNECTOR:
COMPONENT SIDE

AKX00342

AK300407

1

2

AB

B-33 (B)

CONNECTOR: B-33

HARNESS 
CONNECTOR:
COMPONENT SIDE

AKX01502 BB

B-33 HARNESS 
CONNECTOR: 
COMPONENT SIDE

2

1

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-495

STEP 5. Check connector A-18X at MFI relay for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between MFI relay connector 

A-18X (terminal No. 4) and evaporative emission 
purge solenoid connector B-33 (terminal No. 2) 
because of open circuit or short circuit to ground. 
Then go to Step 12.

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

Connector Inspection 

P.00E-2

. Then go to Step 12.

AK300454

2

1

3

4

CONNECTOR: A-18X

AB

A-18X

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-496

STEP 6. Measure the power supply voltage at ECM 
connector C-49 <M/T> or PCM connector <A/T> C-50 by 
backprobing.
(1) Do not disconnect the connector C-49 <M/T> or C-50 

<A/T>.

(2) Turn the ignition switch to the "ON" position.

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

2

3

4

5

6

7

8

9

11

12

13

14

15

16

17

18

19

20

30

21

22

23

24

25

26

27

28

29

31

32

33

34

35

1

10

C-50 (GR)

CONNECTOR: C-50 <A/T>

AB

HARNESS CONNECTOR:
COMPONENT SIDE