Mitsubishi Eclipse. Manual — part 522
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-631
• The ECM <M/T> or PCM <A/T> determines if
there is leak in the fuel system by measuring the
change of vacuum inside the fuel tank.
• The test is stopped when fuel vapor pressure is
judged as too high.
.
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
.
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-632
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Remaining fuel amount is 15
− 40 percent (fuel level
sensor output voltage is 1.4
− 2.4 volts).
Test Conditions A: At Start up
• Intake air temperature is 36°C (97°F) or less
when the engine is started.
• The engine coolant temperature 36°C (97°F) or
less when the engine is started.
Test Conditions B: For Test to Run
• 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 higher than 60°C
(140
°F).
• Power steering pressure switch: "OFF"
• Barometric pressure is above 76 kPa (11 psi).
START
END
MONITORING
CONDITIONS?
GROSS LEAK
MONITORING CONDITIONS
SPECIFIED TIMES
MONITORED
SPECIFIED TIMES
HAVE PASSED
YES
NO
DEPRESSURIZE FUEL TANK PRESSURE
NO
YES
YES
YES
SHUT PURGE LINE
MALFUNCTION
MALFUNCTION
(GROSS LEAK)
GOOD
YES
NO
NO
NO
AC210304
0.04in, 0.02in GROSS LEAK MONITOR
MEASURE REVERTING
PRESSURE :
PFT
PFT > PT
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-633
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
• Vehicle speed is 20 km/h (12.4 mph) or more.
Test Conditions C: For Test to Stop
• Intake air temperature is less than −10°C (14°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises higher 451 Pa (0.065
psi).
• The pressure fluctuation width is higher than 647
Pa (0.094 psi).
• 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
more than 785 Pa (0.114 psi) in 20 seconds after
the tank and vapor line were closed.
• ECM monitors for this condition once during drive
cycle.
NOTE: The monitoring time depends on the fuel
level and the temperature in the fuel tank (75
−
125
seconds).
.
DTC SET CONDITIONS
Remaining fuel amount is 40
− 85 percent (fuel level
sensor output voltage is 2.4
− 3.7 volts)
Test Conditions A: At Start up
• Intake air temperature is 36°C (97°F) or less
when the engine is started.
• The engine coolant temperature 36°C (97°F) or
less when the engine is started.
Test Conditions B: For Test to Run
• The fuel temperature is 36°C (97°F) or less.
• Engine coolant temperature is less than 20°C
(68
°F).
• Barometric pressure is above 76 kPa (11 psi).
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
Test Conditions C: For Test to Stop
• Intake air temperature is less than −10°C (14°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises higher 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
more than 1.9 kPa (0.28 psi) in 128 seconds after
the tank and vapor line were closed.
• ECM monitors for this condition once during drive
cycle.
NOTE: The monitoring time depends on the fuel
level and the temperature in the fuel tank (10
−
14
minutes).
.
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 faulty.
• Fuel tank, purge line or vapor line seal failed.
• Evaporative emission ventilation solenoid failed.
.
OVERVIEW OF TROUBLESHOOTING
• To determine the cause of DTC P0442, a perfor-
mance test is needed. The performance test uses
a mechanical vacuum gauge and scan tool
MB991958 set on the fuel tank differential pres-
sure sensor (TANK PRES SNER 73). The
mechanical gauge reading is used to verify scan
tool MB991958 reading. A comparison of the
mechanical gauge to scan tool MB991958 deter-
mines the problem in the system.
• Prior to doing the performance test, several sim-
ple inspections are needed to exclude some pos-
sibilities of the symptom.
DIAGNOSIS
Required Special Tool:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-634
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.
• With this monitor, the ECM <M/T> or PCM <A/T> auto-
matically increases the engine speed to 1,600 r/min or
more. Check that the transaxle is set to "neutral" <M/T>
or "P" <A/T> 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 the monitor, keep the accelerator pedal at the idling
position.
NOTE: If the engine speed does not reach 2,000 r/min dur-
ing the monitor test, adjustment of the Speed Adjusting
Screw may be needed. 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 the 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: What is displayed on the scan tool MB991507?
"Evap Leak Mon. Completed Test Passed" : The
evaporative emission system is working properly at
this time. Explain to customer that improperly
tightened fuel cap can cause MIL to turn on, and
return the vehicle.
"Evap Leak Mon. Completed. Test Failed and DTCs Set"
:
A malfunction has been detected during the monitor
test. Go to Step 2.
"Evap Lead Mon. discontinued. Retest again from the
first" : The monitor was discontinued for a certain reason
(vehicle speed input from computer, engine speed
and engine load deviating from specified range). Turn
the ignition switch to the "LOCK" (OFF) position once,
and repeat the monitoring from the Step 1.
AC303127
AB
MB991911
16-PIN
MB991827
MB991824
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