Mitsubishi Eclipse. Manual — part 270
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-573
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
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 engine coolant temperature 60°C (140°F) or
more <i.e. the amount of remaining fuel is 15
− 40
percent>.
• The engine coolant temperature 20°C (68°F) or
more <i.e. the amount of remaining fuel is 40
− 85
percent>.
• Engine speed is 1,600 r/min or more.
• 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) <2.4L>
13A-574
• Volumetric efficiency is between 20 and 80 per-
cent.
• The fuel tank temperature is 36°C (97°F) or less.
• Fuel tank differential pressure sensor output volt-
age 1
− 4 volts.
Test Conditions C: For Test to Stop
• Intake air temperature is less than 5°C (41°F).
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises higher 451 Pa (0.065
psi) <i.e. the amount of remaining fuel is 15
− 40
percent>.
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises higher 324 Pa (0.047
psi) <i.e. the amount of remaining fuel is 40
− 85
percent>.
• 10 seconds have elapsed from the start of the
previous monitoring.
Judgment Criteria
• The fuel tank internal pressure is 2 kPa (0.29 psi)
or more after the evaporative emission purge
solenoid has been driven when the fuel tank and
vapor line were closed.
NOTE: The monitoring time (150 seconds) depends
on the fuel level and the temperature in the fuel tank.
.
OBD-ll DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System
.
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 failed.
• Evaporative emission ventilation solenoid failed.
• Fuel tank differential pressure sensor failed.
• Evaporative emission canister seal is faulty.
• Evaporative emission canister is clogged.
.
OVERVIEW OF TROUBLESHOOTING
• To determine the cause of DTC P0455, a perfor-
mance test is needed. The performance test uses
a mechanical vacuum gauge and scan tool
MB991958 or MB991958 set on the fuel tank dif-
ferential pressure sensor (TANK PRES SNER
73.) The mechanical gauge reading is used to
verify scan tool MB991958 or MB991958 reading.
A comparison of the mechanical gauge reading
to scan tool MB991958 or MB991958 reading
determines the reading 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) <2.4L>
13A-575
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 the 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 scan tool MB991958 will change from "NO" to "YES."
Q: What is displayed on scan tool MB991958?
"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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-576
STEP 2. Using scan tool MB991958, check solenoid for
clogging of the purge control.
(1) Disconnect hoses A and B from the evaporative emission
purge solenoid side, and connect the hand vacuum pump to
the evaporative emission purge solenoid instead of hose B.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991958 to actuator test mode for item 08:
Evaporative Emission Purge Solenoid. When the
evaporative emission purge solenoid is operated, apply a
pressure on the hand vacuum pump and confirm that air is
blown from the other side nipple.
(4) Turn the ignition switch to the "LOCK" (OFF) position. Then
disconnect scan tool MB991958.
(5) Disconnect the hand vacuum pump, and connect hoses A
and B to the evaporative emission purge solenoid.
Q: Is the solenoid in good condition?
YES : Go to Step 3.
NO : Replace the evaporative emission purge solenoid.
Then go to Step 27.
STEP 3. Check for leaks and clogging in the evaporator
line hose A to hose C.
Q: Are the hoses in good condition?
YES : Go to Step 4.
NO : Replace the inferior hose. Then go to Step 27.
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 27.
AC000223
THROTTLE
BODY
HOSE B
HOSE A
AG
AC000182
EVAPORATIVE EMISSION
PURGE SOLENOID
AB
AC000223
THROTTLE
BODY
HOSE B
HOSE A
HOSE C
AE
AC000223
THROTTLE
BODY
CHAMBER
AF
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