Mitsubishi Eclipse. Manual — part 275

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L>

13A-593

STEP 1. Using scan tool MB991958, check evaporative
emission system monitor test.

CAUTION

• To prevent damage to scan tool MB991958, always turn

the ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991958.

• With this monitor, the ECM <M/T> or PCM <A/T> auto-

matically increases the engine speed to 1,600 r/min or
more. Check that the transaxle is set to "neutral" <M/T>
or "P" <A/T> position.

(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Erase the DTCs using the scan tool MB991958.
(4) Check that the fuel cap is securely closed. (Tighten until

three clicks are heard.)

(5) Start the engine.
(6) Select "System Test," and press the "YES" key.
(7) Select "Evap Leak Mon," and press the "YES" key.
(8) During the monitor, keep the accelerator pedal at the idling

position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjustment of the Speed Adjusting
Screw may be needed. Refer to

P.13A-928

. And adjust to

the standard value.

(9) Keep the engine speed and engine load within the specified

range. When the monitor test starts, the "In Progress" item
on scan tool MB991958 will change from "NO" to "YES."

(10)Turn the ignition switch to the "LOCK" (OFF) position, and

disconnect scan tool MB991958.

Q: What is displayed on the scan tool MB991958?

"Evap Leak Mon. Completed Test Passed" : The

evaporative emission system is working properly at
this time. Explain to customer that improperly
tightened fuel cap can cause MIL to turn on, and
return the vehicle.

"Evap Leak Mon. Completed. Test Failed and DTCs Set"
:

A malfunction has been detected during the monitor
test. Go to Step 2.

"Evap Lead Mon. discontinued. Retest again from the
first" : The monitor was discontinued for a certain reason

(vehicle speed input from computer, engine speed
and engine load deviating from specified range). Turn
the ignition switch to the "LOCK" (OFF) position once,
and repeat the monitoring from the Step 1.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 2. Check evaporative emission purge solenoid for
leaks.
(1) Remove the battery.
(2) Remove the air intake hose. (Refer to GROUP 15, Air

Cleaner

P.15-6

.)

(3) Disconnect hose B from the evaporative emission purge

solenoid side, and connect a hand vacuum pump to the
nipple of the evaporative emission purge solenoid.

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

that air is maintained.

(5) Disconnect the hand vacuum pump, and connect hose B to

the evaporative emission purge solenoid.

Q: Is the evaporative emission purge solenoid in good

condition?
YES : Go to Step 3.
NO : Replace the evaporative emission purge solenoid.

Then go to Step 18.

STEP 3. Check for leaks in the evaporator line hose A to
hose C.

The leakage test with a hand vacuum pump on each hose
from hose A to hose C.

Q: Are the hoses in good condition?

YES : Go to Step 4.
NO : Replace the inferior hose. Then go to Step 18.

STEP 4. Check for leaks in the chamber.
(1) Connect a hand vacuum pump to the nipple.
(2) Plug the other nipple.
(3) Apply vacuum with the hand vacuum pump, and confirm

that the applied vacuum does not fluctuate.

Q: Is the chamber in good condition?

YES : Go to Step 5.
NO : Replace the chamber. Then go to Step 18.

AC000223

HOSE B

AD

THROTTLE
BODY

AC000182

EVAPORATIVE EMISSION
PURGE SOLENOID

AB

AC000223

THROTTLE
BODY

HOSE B

HOSE A

HOSE C

AE

AC000223

THROTTLE
BODY

CHAMBER

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 5. Check the evaporative emission ventilation
solenoid using scan tool MB991958. (Actuator test item 29)

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) Disconnect the hose E from the evaporative emission

ventilation solenoid side.

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

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

(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool MB991958 to actuator test mode for item 29:

Evaporative Emission Ventilation Solenoid. When the
evaporative emission ventilation solenoid is operated, apply
a pressure on the hand vacuum pump and confirm that air
is maintained.

(6) Turn the ignition switch to the "LOCK" (OFF) position, and

disconnect scan tool MB991958.

(7) Disconnect the hand vacuum pump, and connect hose E to

the evaporative emission canister.

Q: Is the evaporative emission ventilation solenoid in good

condition?
YES : Go to Step 6.
NO : Replace the evaporative emission ventilation

solenoid. Then go to Step 18.

AC303127

AB

MB991911

16-PIN

MB991827

MB991824

AC002030

EVAPORATIVE EMISSION

VENTILATION SOLENOID

HOSE E

AC

AC002031AB

EVAPORATIVE EMISSION

VENTILATION SOLENOID

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L>

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STEP 6. Pressure test for evaporator line from hose D to
hose N.
(1) Remove the module bracket mounting bolts, and

disconnect hose E from the evaporative emission
ventilation solenoid 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 the evaporator line in good condition?

YES : Go to Step 17.
NO : Go to Step 7.

STEP 7. Pressure test for evaporator line from hose G to
hose N.
(1) Disconnect hose G from the evaporative emission canister

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

(2) Perform the pressure test again.
Q: Are the evaporator line in good condition?

YES : Go to Step 8.
NO : Go to Step 10.

AC002028

HOSE E

AC

AC000186

AC002036 AC

HOSE G