Mitsubishi Montero Sport (2004+). Manual — part 274
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-509
.
TECHNICAL DESCRIPTION
• The PCM monitors the Evaporative Emission
(EVAP) System pressure.
• The PCM controls the evaporative emission ven-
tilation solenoid. It closes the evaporative emis-
sion ventilation solenoid to seal the evaporative
emission canister side of the system.
• The evaporative emission purge solenoid is
opened to allow manifold vacuum to create low
pressure (vacuum) in the EVAP system.
• When the EVAP system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid is closed and the fuel system vacuum is
maintained at 2 kPa (0.29 psi).
• The PCM determines whether there is a leak in
the EVAP system by monitoring the vacuum
inside the fuel tank.
• The test is stopped when fuel vapor pressure
exceeds predetermined limits.
.
DESCRIPTIONS OF MONITOR METHODS
• Measure reverting pressure after depressurizing
by intake manifold negative pressure and detect
malfunction if reverting pressure rises largely.
.
MONITOR EXECUTION
• Once per driving cycle.
.
MONITOR EXECUTION CONDITIONS (Other
Monitor and Sensor)
Other Monitor (There is no temporary DTC stored
in memory for the item monitored below)
• Evaporative emission purge solenoid monitor
• Evaporative emission purge system monitor
• Fuel tank differential pressure sensor monitor
• Evaporative emission ventilation solenoid monitor
• Fuel level sensor monitor
• Fuel temperature sensor monitor
Sensor (The sensors below are determined to be
normal)
• Volume airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
.
AC005146
EVAPORATIVE EMISSION CANISTER
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-510
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
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-511
DTC SET CONDITIONS
Remaining fuel amount is 15
− 40 percent of capac-
ity. (fuel level sensor output voltage is 1.4
− 2.4
volts).
Test Conditions:
• Engine coolant temperature is less than 36 °C
(97
°F) when the engine is started.
• Intake air temperature is less than 36 °C (97 °F)
when the engine is started.
• Fuel temperature is less than 36 °C (97 °F), and
with in 800 seconds have elapsed since the
engine was started.
• Engine coolant temperature is greater than 58 °C
(136
°F).
• Intake air temperature is greater than −10 °C (14
°F).
• Barometric pressure is greater than 76 kPa (11
psi).
• Power steering pressure switch: "OFF".
• Fuel tank differential pressure sensor output volt-
age is 1
− 4 volts.
• Pressure fluctuation is less than 647 Pa (0.094
psi).
• When evaporative emission purge solenoid and
evaporative emission ventilation solenoid are
closed, the pressure rises in the fuel tank is less
than 451 Pa (0.065 psi).
• Vehicle speed is greater than or equal to 20 km/h
(12.4 mph).
• 10 seconds have elapsed from the start of the
previous monitoring.
• Monitoring time: 75 − 125 seconds.
Judgment Criteria:
• Internal pressure of the fuel tank has changed
greater than 785 Pa (0.144 psi) in 20 seconds
after the tank and vapor line were closed.
.
DTC SET CONDITIONS
Remaining fuel amount is 40
− 85 percent of capac-
ity. (fuel level sensor output voltage is 2.4
− 3.7
volts).
Test Conditions:
• Engine coolant temperature is less than 36 °C
(97
°F) when the engine is started.
• Intake air temperature is less than 36 °C (97 °F)
when the engine is started.
• Engine coolant temperature is greater than 20 °C
(68
°F).
• Intake air temperature is greater than −10 °C (14
°F).
• Fuel 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
− 4 volts.
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises in the fuel tank is less
than 324 Pa (0.047 psi).
• 10 seconds have elapsed from the start of the
previous monitoring
• Monitoring time: 10 − 14 minutes.
Judgment Criteria:
• Internal pressure of the fuel tank has changed
greater than 1.96 kPa (0.285 psi) in 128 seconds
after the 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
.
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 dose
not seal.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-512
DIAGNOSIS
Required Special Tools:
• MB991958: Scan tool (MUT-III sub assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB cable
• MB991911: MUT-III main harness B
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.
• During this test, the PCM will automatically increase
the engine speed to 1,600 r/min or greater. Check that
the transmission 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" and press the "YES" key.
(7) Select "Evap Leak Mon." and press the "YES" key.
(8) During this test, keep the accelerator pedal at the idle
position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjust the Speed Adjusting Screw.
(Refer to
), 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: 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.
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 monitor test.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
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