Mitsubishi Eclipse. Manual - part 548

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-735

STEP 2. Using scan tool MB991958, check solenoid for 
clogging of the purge control.
(1) Disconnect hoses B and C from the evaporative emission 

purge solenoid side, and connect the hand vacuum pump to 
the evaporative emission purge solenoid instead of hose C.

(2) Set scan tool MB991958 to actuator test mode for item 08: 

Evaporative Emission Purge Solenoid. When the 
evaporative emission purge solenoid is operated, apply a 
pressure on the hand vacuum pump and confirm that air is 
blown from the other side nipple.

(3) Turn the ignition switch to the "LOCK" (OFF) position. Then 

disconnect scan tool MB991958.

(4) Disconnect the hand vacuum pump, and connect hoses B 

and C to the evaporative emission purge solenoid.

Q: Is the solenoid in good condition?

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

Then go to Step 26.

AC106500AD

HOSE B

HOSE C

EVAPORATIVE
EMISSION
PURGE
SOLENOID

<VEHICLES WITHOUT INTAKE MANIFOLD 
TUNING SYSTEM>

AC106498

<VEHICLES WITH INTAKE MANIFOLD 
TUNING SYSTEM>

AE

HOSE C

EVAPORATIVE
EMISSION
PURGE
SOLENOID

HOSE B

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-736

STEP 3. Check for leaks and clogging in the evaporator 
line hose A to hose E <Vehicle without Intake Mnifold 
Tuning System> or hose B, C, E <Vehicle with Intake 
Mnifold Tuning System>.
Q: Are the hoses in good condition?

YES : Go to Step 4.
NO :  Replace the inferior hose. Then go to Step 26.

AC106521

HOSE E

HOSE D

HOSE A

AIR INTALE HOSE

EVAPORATIVE
EMISSION
PURGE
SOLENOID

HOSE C

HOSE B

<VEHICLES WITHOUT INTAKE MANIFOLD 
TUNING SYSTEM>

AE

AC106522

<VEHICLES WITH INTAKE MANIFOLD 
TUNING SYSTEM>

AC

EVAPORATIVE
EMISSION
PURGE
SOLENOID

EVAPORATIVE
EMISSION
PURGE
SOLENOID

HOSE B

HOSE C

HOSE C

HOSE E

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L>

13B-737

STEP 4. Check the evaporative emission ventilation 
solenoid using scan tool MB991958.

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 G 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. Then 

disconnect scan tool MB991958.

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

the evaporative emission canister.

Q: Is the solenoid valve in good condition?

YES : Go to Step 5.
NO :  Replace the evaporative emission ventilation 

solenoid. Then go to Step 26.

AC001252

MB991502

16 PIN

AB

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>

13B-738

STEP5. Pressure test for leaks in the evaporator line from 
hose F to hose P.
(1) Disconnect hose G from the evaporative emission 

ventilation solenoid side, and plug the hoses.

(2) Remove the fuel cap.

(3) Connect the evaporative emission system pressure pump 

to the fuel filler neck.

(4) Apply a pressure on the evaporative emission system 

pressure pump, and confirm that air is maintained.
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) manufacture's instructions located in the lid of the 
pump box.

(5) Disconnect the evaporative emission system pressure 

pump, and reinstall the fuel cap.

(6) Connect hose G to the evaporator line.
Q: Is air maintained?

YES : Go to Step 16.
NO :  Go to Step 6.

STEP 6. Pressure test for leaks in the evaporator line from 
hose I to hose P.
(1) Disconnect hose I from the evaporative emission canister 

side, and plug the hose.

(2) Perform the pressure test again.
Q: Is air maintained?

YES : Go to Step 9.
NO :  Go to Step 7.

AC002028 AB

HOSE G

AC000186

AC002036 AB

HOSE I