Mitsubishi Galant 9G. Manual — part 1094
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-676
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Remaining fuel amount is 15
− 40 percent of capacity
(fuel level sensor output signal voltage is 1.4
− 2.4
volts).
Check Conditions A: At Start up
• Intake air temperature is 36°C (97°F) or less
when the engine is started.
• The engine coolant temperature is 36 °C (97 °F)
or less when the engine is started.
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
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-677
Check Conditions B: For Test to Run
• The fuel tank temperature is less than 36 °C (97
°F), and less than 13 minutes have elapsed since
the engine was started.
• Engine coolant temperature is greater than 60°C
(140
°F).
• Power steering pressure switch: "OFF"
• Barometric pressure is greater than 76 kPa (11
psi).
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
• Vehicle speed is greater than or equal to 20 km/h
(12.4 mph).
Check Conditions C: For Test to Stop
• Intake air temperature is greater than −10°C
(14
°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank is less than
451 Pa (0.065 psi).
• The pressure fluctuation is less than 647 Pa
(0.094 psi).
• 10 seconds have elapsed since the start of the
previous monitoring.
• Monitoring time: 75 − 125 seconds.
Judgment Criteria
• Internal pressure of the fuel tank has changed
more than 977 Pa (0.142 psi) in 20 seconds after
the tank and vapor line were closed.
NOTE: The monitoring time (75
−
125 seconds)
depends on the fuel level and the temperature in
the fuel tank.
The next monitoring occurs at least 10 seconds
later.
.
DTC SET CONDITIONS
Remaining fuel amount is 40
− 85 percent of capacity
(fuel level sensor output voltage is 2.4
− 3.7 volts).
Check Conditions A: At Start up
• Intake air temperature is less than 36 °C (97 °F)
when the engine is started.
• The engine coolant temperature is less than 36
°C (97 °F) when the engine is started.
Check Conditions B: For Test to Run
• The fuel tank temperature is less than 36 °C (97
°F).
• Barometric pressure is greater than 76 kPa (11
psi).
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
Check Conditions C: For Test to Stop
• Intake air temperature is greater than −10 °C
(14
°F).
• Engine coolant temperature is greater than 20 °C
(68
°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure in the fuel tank is less than
451 Pa (0.065 psi).
• 10 seconds have elapsed since the start of the
previous monitoring.
• Monitoring time: 10 − 14 minutes.
Judgment Criteria
• Internal pressure of the fuel tank has changed
more than 2 kPa (0.29 psi) in 128 seconds after
the tank and vapor line were closed.
NOTE: The monitoring time (10
−
14 minutes)
depends on the fuel level and the temperature in
the fuel tank.
The next monitoring occurs at least 10 seconds
later.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak
Monitor
.
TROUBLESHOOTING HINTS (THE MOST
LIKELY CAUSES FOR THIS CODE TO BE
SET ARE:)
• Loose fuel cap.
• Fuel cap relief pressure is incorrect.
• Evaporative emission canister seal is leaking.
• Fuel tank, purge line or vapor line seal is leaking.
• Evaporative emission ventilation solenoid does
not seal.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>
13B-678
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
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-679
STEP 2. Check the evaporative emission purge solenoid
for leaks.
(1) Disconnect hose B from the evaporative emission purge
solenoid and connect a hand vacuum pump to the nipple of
the evaporative emission purge solenoid.
(2) Use the hand vacuum pump to confirm that the evaporative
emission purge solenoid holds vacuum.
(3) Disconnect the hand vacuum pump, and reconnect hose B
to the evaporative emission purge solenoid.
Q: Does the evaporative emission purge solenoid hold
vacuum?
YES : Go to Step 3.
NO : Replace the evaporative emission purge solenoid.
Then go to Step 15.
STEP 3. Check for leaks in evaporative emission hoses A
through D.
Use a hand vacuum pump to test each hose from hose A to
hose D.
Q: Do the hoses hold vacuum?
YES : Go to Step 4.
NO : Replace any damaged hose. Then go to Step 15.
AC306390AB
HOSE B
AC306388
AC306389AB
HOSE C
HOSE B
HOSE A
AC306799
AB
HOSE D
THROTTLE BODY
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