Mitsubishi Eclipse / Eclipse Spyder (2000-2002). Service and repair manual — part 284

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-335

STEP 3. Check the evaporative emission purge solenoid
valve using the scan tool MB991502. (Actuator test item
08.)
(1) Turn the ignition switch to the "ON" position.
(2) Connect the hand vacuum pump to the nipple of the

evaporative emission purge solenoid from which the hoses
have been disconnected.

(3) Apply a vacuum on the hand vacuum pump, and confirm

that the applied vacuum does not fluctuate.
If the vacuum fluctuates, refer to

P.13B-289

, diagnosis step

for evaporative emission purge solenoid trouble code DTC
P0443.

(4) While maintaining the vacuum, carry out the actuator test

with scan tool MB991502.

Q: Does the vacuum pump gauge indicate the atmospheric

pressure when the evaporative emission purge solenoid
is activated?
The evaporative emission purge solenoid valve
operates normally, and the vacuum pump gauge
reading returns to the atmospheric pressure : Go to

Step 32.

The evaporative emission purge solenoid valve
operates normally, but the vacuum pump gauge does
not indicate the atmospheric pressure : Replace the

evaporative emission purge solenoid. Then go to Step
32.

The evaporative emission purge solenoid valve does
not operate normally : Refer to

P.13B-289

, diagnosis step

for evaporative emission purge solenoid trouble code
DTC P0443.

STEP 4. Check for leaks in the evaporator line hose A and
evaporative emission purge solenoid valve.
(1) Use scan tool MB991502 to activate the evaporative

emission purge solenoid valve.

Q: Does the vacuum leak?

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

AC002074

HOSE B

AB

AC002075

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-336

STEP 5. Check for clogging in the evaporator line hose A.
(1) Sequentially apply vacuum with a hand vacuum pump

connected to hose A.

Q: Are there any clogs?

YES : Replace that hose, and perform the purge flow check.

(Refer to GROUP 17, Engine Emission Control

−

Evaporative Emission Control System

−

Purge

Control System Check

P.17-92

.)

NO : Go to Step 32.

AC002283

HOSE A

AB

AC002074

HOSE B

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-337

STEP 6. Check the evaporative emission ventilation
solenoid using the scan tool MB991502. (Actuator test item
29)
(1) Turn the ignition switch to the "ON" position, remove the

module bracket mounting volts and disconnect hose G from
the evaporative emission ventilation solenoid side.

(2) Connect the hand vacuum pump to the nipple of the

evaporative emission ventilation solenoid from which the
hoses have been disconnected.

(3) Apply a vacuum on the hand vacuum pump, and confirm

that pressure is applied.
If the vacuum is maintained, refer to

P.13B-297

,

evaporative emission ventilation solenoid trouble code DTC
P0446.

(4) Drive the evaporative emission ventilation solenoid with the

scan tool MB991502 actuator test, and confirm that the
vacuum does not fluctuate when the vacuum is applied with
the hand vacuum pump.

Q: Does the vacuum pump gauge reading return to the

atmospheric pressure when the evaporative emission
ventilation solenoid valve is activated?
The evaporative emission ventilation solenoid valve
operates normally and the vacuum pump gauge reading
does not fluctuate : Go to Step 7.
The evaporative emission ventilation solenoid valve
operates normally, but the vacuum can not be
maintained : Replace the evaporative emission ventilation

solenoid. Then go to Step 32.

The evaporative emission ventilation solenoid valve
does not operate normally : Refer to

P.13B-297

,

diagnosis step for evaporative emission ventilation
solenoid trouble code DTC P0446.

AC002030 AB

HOSE G

EVAPORATIVE EMISSION

VENTILATION SOLENOID

AC002031AB

EVAPORATIVE EMISSION

VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-338

STEP 7. Pressure test for evaporator line from hose C to
hose P.
(1) Disconnect hose G from the filler neck assembly side, and

plug the hoses from which the hoses have been
disconnected.

(2) Confirm that the evaporative emission system pressure

pump (Miller number 6872A) is operating properly. Perform
the self-test as described in the manufacturer's instructions.

(3) Connect an evaporative emission system pressure pump to

the fuel filler neck.

(4) Pressure test the system to determine whether any leaks

are present.

NOTE: "Pressure test" in this procedure refers to the I/
M240 Simulation Test (8 simple steps) described in the
evaporative emission system pressure pump (Miller number
6872A) manufacturer's instructions located in the lid of the
pump box.

Q: Are there any leaks in the evaporator line?

YES : Go to Step 8.
NO : Go to Step 20.

STEP 8. Pressure test for evaporator line from hose I to
hose P.
(1) Disconnect hose I from the evaporative emission canister

side, and plug the hose from which the pipes have been
disconnected.

(2) Perform the pressure test again.

Q: Is the pressure maintained inside the evaporator line?

YES : Go to Step 9 .
NO : Go to Step 12 .

AC002028 AB

HOSE G

AC000186

AC002036 AB

HOSE I