Mitsubishi Galant. Manual — part 263

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-277

STEP 13. Check for leaks in the fuel tank.
(1) Visually check for cracks and leaks, etc.

NOTE: Carefully check the fuel pump assembly and the
inner pressure sensor installation section in the fuel tank.

(2) Connect an evaporative emission system pressure pump to

the leveling valve nipple.

(3) Plug the filler hose, feed pipe, return pipe and rollover valve

nipple connected to the fuel tank.

NOTE: If these items are not securely plugged here, the
fuel could leak in the next step.

(4) Apply pressure with the evaporative emission system

pressure pump.

(5) In the pressurized state, check for the leak by applying soap

water, etc. to each section.

Q: Can the leaks be pinpointed?

There is leaks at the fuel pump assembly or the inner
pressure sensor installation section : Reassemble the

parts, check again that there are no leaks, reinstall
the fuel tank. Then go to Step 1.

There is leaks at another section : Go to Step 14.

STEP 14. Visually check for cracks in the fuel tank filler
neck.
(1) Visually check for cracks in the fuel tank filler neck.

Q: Can the cracks be found out?

YES : Replace the fuel tank filler neck, reinstall the fuel tank.

Then go to Step 1 .

NO : Reinstall the fuel tank. Then go to Step 1.

AC000196

AC000197

AC000198

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-278

STEP 15. Check for leaks in the evaporator line from hose
J to hose K.
(1) The leakage test with a hand vacuum pump on each hose

from hose J to hose K.

Q: Can the leaks be pinpointed?

YES : Replace the hose, reinstall the fuel tank. Then go to

Step 1.

NO : Go to Step 1.

AC002033 AB

HOSE K

HOSE J

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-279

DTC P0443: Evaporative Emission Control System Purge Control Valve Circuit Malfunction

AK000543

3 4

1 2

RED-

WHITE

RED-

WHITE

RED-

WHITE

RED

2

1

BLUE

BATTERY

MFI
RELAY

A-21X

1

2

3

4

34

POWERTRAIN
CONTROL MODULE(PCM)

B-04
MU802779

EVAPORATIVE
EMISSION
PURGE
SOLENOID

1

2

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-39
(MU803784)

MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-280

CIRCUIT OPERATION

•

Power to the evaporative emission purge
solenoid power is supplied from the MFI relay
(terminal 1).

•

The PCM controls ground evaporative emission
purge solenoid by turning the power transistor in
the PCM "ON" and "OFF."

TECHNICAL DESCRIPTION

•

To judge if there is open circuit in the evaporative
emission purge solenoid drive circuit, PCM
measures the surge voltage of the evaporative
emission ventilation solenoid coil.

•

The PCM drives the evaporative emission purge
solenoid for 30 milliseconds. After the solenoid is
turned off, the PCM will check if the solenoid coil
produces a surge voltage of 2V or more.

DTC SET CONDITIONS

Test Conditions

•

Battery positive voltage is between 10 V and 16
V.

•

The engine is running

Judgment Criteria

•

If a surge voltage of 2 V or more is not detected
within 30 milliseconds after the evaporative
emission purge solenoid is driven, the PCM
judges that the drive circuit is open.

•

Only one monitor during one drive cycle.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

•

Evaporative emission purge solenoid failed.

•

Open or shorted evaporative emission purge
solenoid circuit, or loose connector.

•

PCM failed.

DIAGNOSIS

Required Special Tools
MB991502: Scan Tool (MUT-II)

AK000555AB

CONNECTOR : A-21X

MFI RELAY

ACX02514 AI

EVAPORATIVE
EMISSION
PUREGE
SOLENOID
VALVE

CONNECTOR:B-04

AK000280

CONNECTOR : C-39

PCM

AW