Mitsubishi Eclipse. Manual — part 274
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-589
STEP 26. Check for clogging in the evaporator line from
hose N.
(1) The clogging test with a hand vacuum pump on the hose N.
Q: Is the hose N in good condition?
YES : Go to Step 27.
NO : Replace the hose N, and reinstall the fuel tank. (Refer
to GROUP 13C, Fuel Tank
.) Then go to
Step 27.
STEP 27. Test the OBD-II drive cycle.
(1) Confirm the repair by performing the appropriate drive cycle
(Refer to Diagnostic Function
− OBD-ll Drive Cycle −
Procedure 1
− Evaporative Emission System Leak Monitor
).
(2) Read the diagnostic trouble code.
Q: Is diagnostic trouble code P0455 set?
YES : Go to Step 1.
NO : This diagnosis is complete.
DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak)
AC000195
HOSE N
AD
AC001943AB
A
B
C
EVAPORATIVE EMISSION
PURGE SOLENOID
EVAPORATIVE
EMISSION CANISTER
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
FUEL TANK
CHECK VALVE A
CHECK
VALVE B
INTAKE MANIFOLD
SYSTEM DIAGRAM
D
E
F
G
I
H
L
N
M
K
J
O
P
CHAMBER
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-590
.
TECHNICAL DESCRIPTION
• To judge if there is leak in the fuel system, ECM
<M/T> or PCM <A/T> measure the change of the
pressure inside the fuel tank.
• The ECM <M/T > or PCM <A/T> turns on the
evaporative emission ventilation solenoid valve to
shot off the evaporative emission canister outlet
port.
• Then the evaporative emission purge solenoid
valve is driven to set the fuel system into a nega-
tive pressure.
• When the fuel system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid valve is turned "off" and the fuel system
vacuum is maintained at 2 kPa (0.29 psi).
• 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)
• Mass airflow sensor
• Barometric pressure sensor
• Intake air temperature sensor
• Engine coolant temperature sensor
.
AC000183AB
EVAPORATIVE EMISSION CANISTER
FUEL TANK
AC000182
EVAPORATIVE EMISSION
PURGE SOLENOID
AB
AC002035AB
EVAPORATIVE EMISSION
VENTILATION SOLENOID
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-591
LOGIC FLOW CHARTS (Monitor Sequence)
.
DTC SET CONDITIONS
Test Conditions A: At Start up
• The fuel level sensor output voltage is 2.4 − 3.7
volts when the engine starts (i.e. the amount of
remaining fuel is 40
− 85 percent)
• 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
• Barometric pressure is above 76 kPa (11 psi).
• The fuel tank temperature is 33°C (91°F) or less
• Fuel tank differential pressure sensor output volt-
age is 1 to 4 volts.
Test Conditions C: For Test to Stop
• Engine coolant temperature is less than 20°C
(68
°F).
• Intake air temperature is less than −10°C (14°F).
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-592
• When the evaporative emission purge solenoid
and evaporative emission ventilation solenoid are
closed, the pressure rises higher 324 Pa (0.047
psi).
Judgment Criteria
• Internal pressure of the fuel tank fluctuate 1177 −
1373 Pa (0.171
− 0.199 psi) or more in 10 sec-
onds 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
.
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 valve
failed.
.
OVERVIEW OF TROUBLESHOOTING
• To determine the cause of DTC P0456, 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
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