Mitsubishi Galant 9G. Manual — part 1125

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-800

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

STEP 1. Using scan tool MB991958, check the 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.

• During this test, the PCM will automatically increase

the engine speed to 1,600 r/min or greater. Check that
the transaxle is set to the "P" 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 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."
(7) Select "Evap Leak Mon."
(8) During this test, keep the accelerator pedal at the idle

position.

(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: Is "Evap Leak Mon. Completed. Test Failed and DTCs

Set" displayed on scan tool MB991958?
YES : A malfunction has been detected during the monitor

test. Refer to the Diagnostic Trouble Code Chart and
diagnose any other DTCs that are set

P.13B-34

. If no

other DTC's have been set, go to Step 2.

NO <"Evap Leak Mon. Completed. Test Passed" is
displayed on scan tool MB991958.> : The evaporative

emission system is working properly at this time.
Explain to the customer that an improperly tightened
fuel cap can cause the MIL to illuminate. Return the
vehicle to the customer.

NO <"Evap Leak Mon. Discontinued. Retest again from
the first" is displayed on scan tool MB991958.> : The

EVAP monitor has been interrupted during the test.
Turn the ignition switch to the "LOCK" (OFF) position
once, and repeat the monitoring from Step 1.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-801

STEP 2. Using scan tool MB991958, check actuator test
item 08: Evaporative Emission Purge Solenoid Valve.

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 hoses A and B from the evaporative emission

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

(3) Turn the ignition switch to the "ON" position.
(4) Set scan tool MB991958 to actuator test mode.

• Item 08: Evaporative Emission Purge Solenoid Valve.

• When the evaporative emission purge solenoid

valve is operated, apply a pressure on the hand vac-
uum pump and confirm that air is blown from the
other side nipple.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
(6) Disconnect the hand vacuum pump, and connect hoses A

and B to the evaporative emission purge solenoid valve.

Q: Is the solenoid valve in good condition?

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

valve. Then go to Step 19.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC306390

AC306391AB

HOSE B

HOSE A

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-802

STEP 3. Check for leaks and clogging in evaporative
emission hoses A through D.
Use a hand vacuum pump to test each hose from hose A to
hose D.
Q: Are the hoses in good condition?

YES : Go to Step 4.
NO : Replace the damaged hose. Then go to Step 19.

STEP 4. Check for leaks and clogging in the chamber.
(1) When you blow the chamber, it should pass less air.
(2) When you blow the chamber, on air should leak from the

chamber body.

Q: Is the chamber in good condition?

YES : Go to Step 5.
NO : Replace the chamber. Then go to Step 19.

AC306388

AC306389AB

HOSE C

HOSE B

HOSE A

AC306799

AB

HOSE D

THROTTLE BODY

AC306388

AC306389AC

CHAMBER

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-803

STEP 5. Check for leaks and clogging in evaporative
emission hoses E through G.

Perform a vacuum test using a hand vacuum pump on
hoses E through G.

Q: Are the hoses in good condition?

YES : Go to Step 6.
NO : Replace the damaged hose. Then go to Step 19.

AC306710

HOSE E

AC

AC306401

HOSE G

HOSE F

AD