Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 141

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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STEP 24. Check for clogging in the evaporator line from
hose E and hose F.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel Tank

P.13C-6

.)

(2) Carry out the clogging test with a hand vacuum pump on

each hose from hose E and hose F.

Q: Are there any clogs?

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

Step 26.

NO : Go to Step25.

STEP 25. Check for clogging in the evaporative emission
canister.
(1) Connect a hand vacuum pump to the vent nipple of the

evaporative emission canister.

(2) Plug the other two nipples or loop a hose between the other

nipples.

(3) Apply vacuum. When each nipple is unplugged, the vacuum

should fluctuate.

Q: Does the vacuum pump gauge reading fluctuate?

YES : Reinstall the fuel tank. Then go to Step 26.
NO : Replace the evaporative emission canister, reinstall

the fuel tank. Then go to Step 26.

STEP 26. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. (Refer to

P.13A-5

, Procedure 1

−

Evaporative Emission Control

system Leak Monitor.)

(2) Read the diagnostic trouble code P0450 does not reset.

Q: Are the DTCs reset?

YES : This diagnosis is complete. (If no malfunctions are not

found in all steps, an intermittent malfunction is
suspected.) Refer to GROUP INTRODUCTION, How
to Use Troubleshooting/Inspection Service Points

−

How to Cope with Intermittent Malfunction

P.00-6

.

NO : Replace the ECM or PCM.

AC002037

HOSE E

HOSE F

AF

AC000191AB

VENT
NIPPLE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak)

TECHNICAL DESCRIPTION

•

To judge if there is leak or clog in the fuel system,
the ECM <M/T> or PCM <A/T> measures the
change of the pressure inside the fuel tank.

•

The ECM <M/T> or PCM <A/T> turns on the
evaporative emission ventilation solenoid to shut
off the evaporative emission canister outlet port.

AC001943AB

A

B

C

EVAPORATIVE EMISSION
PURGE SOLENOID

EVAPORATIVE
EMISSION CANISTER

EVAPORATIVE
EMISSION
VENTILATION
SOLENOID

FUEL TANK

CHECK VALVE A

CHECK
VALVE B

INTAKE MANIFOLD

SYSTEM DIAGRAM

D

E

F

G

I

H

L

N

M

K

J

O

P

CHAMBER

AC000183AB

EVAPORATIVE EMISSION CANISTER

FUEL TANK

AC000182

EVAPORATIVE EMISSION
PURGE SOLENOID

AB

AC002035AB

EVAPORATIVE EMISSION
VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

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•

Then the evaporative emission purge solenoid is
driven to set the fuel system into a negative
pressure.

•

When the fuel system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid is turned "off" and the fuel system
vacuum is maintained at 2 kPa (0.29 psi.)

•

The ECM <M/T> or PCM <A/T> determines if
there is leak or clog in the fuel system by
measuring the change of vacuum inside the fuel
tank.

•

The test is stopped when fuel vapor pressure is
judged as too high.

DTC SET CONDITIONS

Test Conditions A: At Start up

•

Intake air temperature is 30

°

C (86

°

F) or less

when the engine is started.

•

The engine coolant temperature is 30

°

C (86

°

F) or

less when the engine is started.

Test Conditions B: For Test to Run

•

With in 16 minutes after the engine is started.

•

Engine coolant temperature is higher than 60

°

C

(140

°

F.)

•

Engine speed is 1,600 r/min or more.

•

Power steering pressure switch: "OFF."

•

Barometric pressure is above 76 kPa (11 psi.)

•

Volumetric efficiency is between 20 and 80
percent.

•

Vehicle speed is 30 km/h (18.7 mph) or more.

Test Conditions C: For Test to Stop

•

Intake air temperature is less than 5

°

C (41

°

F.)

•

When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises to 451 Pa (0.065 psi.)

•

The pressure fluctuation width is less than 647
Pa (0.094 psi.)

•

Fuel tank differential pressure sensor output
voltage 1

−

4 V.

Judgment Criteria

•

The fluctuation of fuel tank internal pressure is
less than 324 Pa (0.047 psi) in 20 seconds after
the evaporative emission purge solenoid had
been driven when the fuel tank and vapor line
were closed.

NOTE: The monitoring time (75

−

125 seconds.)

depends on the fuel level and the temperature in the
fuel tank.

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

•

Loose fuel cap.

•

Fuel cap relief pressure is incorrect.

•

Fuel overflow limiter valve failed.

•

Purge line or vapor line is clogged.

•

Fuel tank, purge line or vapor line seal failed.

•

Evaporative emission purge solenoid failed.

•

Evaporative emission ventilation solenoid failed.

•

Fuel tank differential pressure sensor failed.

•

Evaporative emission canister seal is faulty.

•

Evaporative emission canister is clogged.

OVERVIEW OF TROUBLESHOOTING

•

To determine the cause of DTC P0455, a
performance test is needed. The performance
test uses a mechanical vacuum gauge and scan
tool MB991502 set on the fuel tank differential
pressure sensor (TANK PRES SNER 73.) The
mechanical gauge reading is used to verify scan
tool MB991502 reading. A comparison of the
mechanical gauge reading to the scan tool
MB991502 reading determines the reading
problem in the system.

•

Prior to doing the performance test, several
simple inspections are needed to exclude some
possibilities of the symptom.

DIAGNOSIS

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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
In this procedure, scan tool MB991502 should be used in the
metric mode (showing the value in kPa). If not, set scan tool
MB991502 by selecting the "System Setup" at the main menu.

STEP 1. Check for leaks in the evaporator line hose A and
evaporative emission purge solenoid valve.
(1) Disconnect hose A at the intake manifold side, and then

connect a hand vacuum pump to the hose.

(2) Apply vacuum.

NOTE: The vacuum should be 40 kPa (5.8 psi) or less.

Q: Is the vacuum maintained?

YES : Go to Step 4.
NO : Go to Step 2.

STEP 2. Check for leaks in the evaporator line hose A.
(1) The leakage test with a hand vacuum pump on hose A.

Q: Are there any leaks?

YES : Replace that hose. Then go to Step 34.
NO : Go to Step 3.

AC001252

MB991502

16 PIN

AB

AC000222

HOSE A

AB

AC000223

HOSE A

AB