Mitsubishi Eclipse. Manual - part 529

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-659

STEP 12. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-7

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0443 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK300458

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

CONNECTOR: C-52 <A/T>

C-52 (GR)

AB

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-660

DTC P0446: Evaporative Emission Control System Vent Control Circuit

AK101616

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

1

8

7

10

5

3

1 2

4

6

9

2

RED

RED

RED

YELLO

W

YELLO

W

YELLO

W

YELLO

W

4

3

1

2

     D-10
MU802779

BATTERY

1

2

ENGINE CONTROL
MODULE (ECM) <M/T>
OR
POWERTRAIN CONTROL
MODULE (PCM) <A/T>

MFI
RELAY

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

     D-16
MU802355

7

2

28

9

26

24

35

C-51 <M/T>, C-52 <A/T>
         (MU803784)

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

3132 33

34 35

1

10

C-28

7 8

5

3 4

35

34

10 11 12

2122 23 24

13 14 15

25 26 27

16

28

17

18 19 20

29

30 31

32 33

36 37

38

9

1 2

6

4

17

1

12 13 14

18

30

41

34

3

16

10

6 7

19

31

42

20

32

43

21

33

25

24

26

36

35

37

29

28

15

27

38

8 9

39 40

11

2

22

5

23

C-90

Evaporative Emission Ventilation Solenoid Circuit

3 4

1 2

A-18X

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-661

.

CIRCUIT OPERATION

• The evaporative emission ventilation solenoid 

power is supplied from the MFI relay (terminal 
No. 4).

• The ECM <M/T> or PCM <A/T> controls the 

evaporative emission ventilation solenoid ground 
by turning the power transistor in the ECM <M/T> 
or PCM <A/T> ON and OFF.

.

TECHNICAL DESCRIPTION

• To judge if there is open circuit in the evaporative 

emission ventilation solenoid drive circuit, ECM 
<M/T> or PCM <A/T> measures the surge volt-
age of the evaporative emission ventilation sole-
noid coil.

• The ECM <M/T> or PCM <A/T> drives the evapo-

rative emission ventilation solenoid. After the 
solenoid is turned off, the ECM <M/T> or PCM 
<A/T> will check if the solenoid coil produces a 
surge voltage of 2 volts or more.

AK300115

CONNECTOR: D-10

EVAPORATIVE EMISSION
VENTILATION SOLENOID

AB

D-10 (B)

AK300244

CONNECTOR: C-52 <A/T>

AC

PCM

C-52 (GR)

AK300091

CONNECTOR: C-51 <M/T>

ECM

AF

C-51 (GR)

AK300121

MFI RELAY

CONNECTOR: A-18X

AB

A-18X

AK300119

CONNECTOR: C-28

AB

C-28

AK300118

CONNECTOR: C-90

AB

C-90

AK300098

CONNECTOR: D-16

AB

D-16 (B)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-662

.

DESCRIPTIONS OF MONITOR METHODS
Off-surge does not occur after solenoid is operated 

on to off.

.

MONITOR EXECUTION
Once per driving cycle

.

MONITOR EXECUTION CONDITIONS (Other 
monitor and Sensor)

Other Monitor (There is no temporary DTC stored 

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be 

normal)

• Not applicable

.

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Engine is being cranked.

• Battery positive voltage is at between 10 and 

16.5 volts.

Judgment Criteria

• The evaporative emission ventilation solenoid 

coil surge voltage (battery positive voltage + 2 
volts) is not detected for 0.2 second.

• The ECM <M/T> or PCM <A/T> monitors for this 

condition once during the drive cycle.

Check Conditions

• Battery positive voltage is at between 10 and 

16.5 volts.

• ON duty cycle of the evaporative emission purge 

solenoid is 0 percent.

• ON duty cycle of the EGR vacuum regulator sole-

noid valve is 0 percent.

• Evaporative emission ventilation solenoid is ON.

• More than 1 second has elapsed after the above 

mentioned conditions have been met. 

MONITORING

CONDITIONS

NO

NO

YES

YES

GOOD

MALFUNCTION

WAS SURGE VOLTAGE

(> V

B

+2V) DETECTED?

START

END

AK301449