Mitsubishi Galant. Manual — part 273
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-317
STEP 19. Using scan tool MB991502, check data list item
73: Fuel Tank Differential Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Remove the fuel cap.
(4) Set scan tool MB991502 to the data reading mode for item
73, Fuel Tank Differential Pressure Sensor.
•
The fuel tank pressures should be
−
1.5 to 1.5kPa.
(5) Connect an evaporative emission system pressure pump to
the fuel filler neck, and apply pressure.
•
The scan tool reading should increase.
Q: Is the scan tool reading within the specified value?
YES : Go to Step 26.
NO : Replace the PCM. Then go to Step 26.
STEP 20. Check for clogging in the evaporator line from
hose G to hose I and from hose L to hose P.
(1) Remove the module bracket mounting bolts, and
disconnect hose G from the evaporative emission
ventilation solenoid side, and plug the hoses from which the
hoses have been disconnected.
(2) Install the EVAP pressure pump outlet hose to the fuel tank
filler neck as described in the pump manufacturer's
instructions.
(3) On the EVAP pressure pump, set the pressure/hold valve to
OPEN, and set the vent valve to CLOSED.
(4) Turn the pump timer to ON. You can reset the timer as
required. (These settings are listed under "Leak Test" in the
pump instructions.)
(5) When the hose G is unplugged, the air passes through the
hose G.
Q: Does air pass through the hose G?
YES : Go to Step 21.
NO : Go to Step 23.
AC003081 AB
16 PIN
MB991502
AC000186
AC002028 AB
HOSE G
OPEN
OPEN
CLOSED
CLOSED
Pressure
Hold
Vent
ACX01806
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-318
STEP 21. Check the vent valve module for clogging.
(1) Check the orvr vent valve module for clogging. (Refer to
GROUP 17
−
Vent Valve
.)
Q: Air there any clogs?
YES : Replace the vent valve module. Then go to Step 26.
NO : Go to Step 22.
STEP 22. Check for clogging in the evaporator lines Q and
hose R.
(1) Apply vacuum with a hand vacuum pump connected to
hose Q and hose R.
Q: Are there any clogs?
YES : Replace that hose. Then go to Step 26.
NO : Go to Step 26.
STEP 23. Check for clogging in the evaporator lines I.
(1) Apply vacuum with a hand vacuum pump connected to
hose I.
Q: Are there any clogs?
YES : Replace that hose. Then go to Step 26.
NO : Go to Step 24.
AC002034 AB
AC002033
HOSE R
AC
HOSE Q
AC002072 AB
HOSE I
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-319
STEP 24. Check for clogging in the evaporator line from
hose G and hose H.
(1) Remove the fuel tank. (Refer to GROUP 13C, Fuel
Tank
(2) Carry out the clogging test with a hand vacuum pump on
each hose from hose G and hose H.
Q: Are there any clogs?
YES : Replace that hose, reinstall the fuel tank. Then go to
Step 26.
NO : Go to Step 25.
STEP 25. Check for clogging in the evaporative emission
canister.
(1) Connect a hand vacuum pump to the vent nipple of the
evaporative emission canister.
(2) Plug the other two nipples or loop a hose between the other
nipples.
(3) Apply vacuum. When each nipple is unplugged, the vacuum
should fluctuate.
Q: Does the vacuum pump gauge reading fluctuate?
YES : Reinstall the fuel tank. Then go to Step 26.
NO : Replace the evaporative emission canister, reinstall
the fuel tank. Then go to Step 26.
STEP 26. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. (Refer to
, Procedure 1
−
Evaporative Emission Control
system Leak Monitor.)
(2) Read the diagnostic trouble code P0450 does not reset.
Q: Are the DTCs reset?
YES : This diagnosis is complete. (If no malfunctions are not
found in all steps, an intermittent malfunction is
suspected.) Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
−
How to
Cope with Intermittent Malfunction
NO : Replace the PCM.
AC002037
HOSE H
AD
HOSE G
AC000191AB
VENT
NIPPLE
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-320
DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak)
TECHNICAL DESCRIPTION
•
To judge if there is leak or clog in the fuel system,
the PCM measures the change of the pressure
inside the fuel tank.
•
The PCM turns on the evaporative emission
ventilation solenoid to shut off the evaporative
emission canister outlet port.
AC001944
CHECK VALVE A
CHECK
VALVE B
EVAPORATIVE
EMISSION CANISTER
FUEL TANK
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
EVAPORATIVE EMISSION
PURGE SOLENOID
INTAKE MANIFOLD
SYSTEM DIAGRAM
A
B
C
D
E
F
G
Q
R
I
H
K
J
L
N
O
M
AB
P
AC000183AB
EVAPORATIVE EMISSION CANISTER
FUEL TANK
AC002073 AB
EVAPORATIVE EMISSION
PURGE SOLENOID
AC002035AB
EVAPORATIVE EMISSION
VENTILATION SOLENOID
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