Mitsubishi Galant 9G. Manual — part 823

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-734

LOGIC FLOW CHARTS (Monitor Sequence)

.

AC306649

0.04in, 0.02in GROSS LEAK MONITOR

START

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

MONITORING
CONDITIONS?

DEPRESSURIZE FUEL TANK PRESSURE

GROSS LEAK

MONITORING CONDITIONS

SHUT PURGE LINE

MEASURE REVERTING
PRESSURE : PFT

PFT > PT

SPECIFIED TIMES

MONITORED

MALFUNCTION

END

SPECIFIED TIMES

HAVE PASSED

MALFUNCTION

(GROSS LEAK)

GOOD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-735

DTC SET CONDITIONS

Check Conditions A: At Start up

• Intake air temperature is 36°C (97°F) or less

upon engine start up.

• The engine coolant temperature is 36°C (97°F) or

less upon engine start up.

Check Conditions B: For Test to Run

• The engine coolant temperature is 60°C (140°F)

or greater and the fuel tank is 15

− 40 percent full.

• The engine coolant temperature is 20°C (68°F) or

greater and the fuel tank is 40

− 85 percent full.

• The engine speed is greater than or equal to

1,600 r/min.

• Barometric pressure is greater than 76 kPa (11

psi).

• Volumetric efficiency is between 20 and 70 per-

cent.

• The fuel tank temperature is 36°C (97°F) or less.

• The fuel tank differential pressure sensor output

voltage is 1

− 4 volts.

Check Conditions C: For Test to Stop

• The intake air temperature is greater than 5°C

(41

°F).

• When the evaporative emission purge solenoid

and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank rises to 451
Pa (0.065 psi) or less and the amount of remain-
ing fuel is 15

− 40 percent of capacity upon

engine start-up.

• When the evaporative emission purge solenoid

and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank rises to 324
Pa (0.047 psi) or less and the amount of remain-
ing fuel is 40

− 85 percent of capacity upon

engine start-up.

• 10 seconds have elapsed from the start of the

previous monitoring.

• Monitoring time: 150 seconds.

Judgment Criteria

• The fuel tank internal pressure is 2 kPa (0.29 psi)

or more after the evaporative emission purge
solenoid valve has been driven when the fuel
tank and vapor line were closed.

.

OBD-ll DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-ll Drive Cycle −

Procedure 1

− Evaporative Emission System Leak

Monitor

P.13A-6

.

.

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 valve failed.

• Evaporative emission ventilation solenoid valve

failed.

• Fuel tank differential pressure sensor failed.

• Evaporative emission canister seal is faulty.

• Evaporative emission canister is clogged.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-736

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.13A-33

. 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

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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-737

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 B and C from the evaporative emission

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

(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

AC306394

HOSE C

HOSE B

AB