Mitsubishi Montero (2004+). Manual — part 280
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-607
STEP 13. Check the harness wires between PCM
connector D-134 terminal 82 and fuel tank differential
pressure sensor connector G-05 terminal 1 for damage.
Q: Are the harness wires in good condition?
YES : It can be assumed that this malfunction is intermittent.
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
). Go to
Step 15.
NO : Repair the damaged harness wires. Go to Step 15.
AC203997
CONNECTOR: D-134
AC
D-134 (GR)
PCM
D-134 HARNESS CONNECTOR:
HARNESS SIDE
64
63
65 66 67 68
62
61
69 70 71 72 73
74 75 76 77 78 79 80 81 82
83 84
85 86 87
88 89
ACX00218
CONNECTOR : G-05
AR
G-05 (B)
SECOND SEAT UNDER
SERVICE HOLE
G-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-608
STEP 14. Using scan tool MB991958, check data list item
73: Fuel Tank Differential Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
(1) Connect scan tool MB991958 to the data link connector.
(2) Disconnect hose F from the evaporative emission canister
side, and plug the hose.
(3) Turn the ignition switch to the "ON" position.
(4) Remove the fuel cap.
(5) Set scan tool MB991958 to the data reading mode.
Item 73, Fuel Tank Differential Pressure Sensor.
• The fuel tank pressures reading on the scan tool
should be
−1.5 to 1.5 kPa (−0.443 to 0.443 inHg).
(6) Connect an evaporative emission system pressure pump to
the fuel tank filler tube and pressurize the fuel tank.
• The fuel tank pressure reading should increase.
(7) Disconnect an evaporative emission system pressure pump
and connect hose F.
(8) Turn the ignition switch to the "LOCK" (OFF) position and
disconnect scan tool MB991958.
Q: Is the fuel tank pressure between
−1.5 and 1.5 kPa
(
−0.443 and 0.443 inHg)?
YES : It can be assumed that this malfunction is intermittent.
(Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunction
). Go to
Step 15.
NO : Replace the PCM (Refer to
). Go to Step
AC306409AF
MB991911
MB991824
MB991827
AC102602 AC
HOSE F
ACX01358
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-609
STEP 15. Perform the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern (Refer to
Diagnostic Function
− OBD-ll Drive Cycle − Procedure 1 −
Evaporative Emission System Leak Monitor
(2) Read the diagnostic trouble code (DTC).
Q: Is DTC P0453 set?
YES : Repeat the troubleshooting from Step 2.
NO : The procedure is complete.
DTC P0455: Evaporative Emission System Leak Detected (Gross Leak)
AC203991
SYSTEM DIAGRAM
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
Q
S
R
P
FUEL TANK
CHECK VALVE B
CHECK VALVE A
EVAPORATIVE
EMISSION
PURGE
SOLENOID
EVAPORATIVE EMISSION
VENTILATION SOLENOID
EVAPORATIVE
EMISSION
CANISTER
VENT PIPE
ASSEMBLY
AD
ONBOARD REFUELING
VAPOR RECOVERY(ORVR)
VENT VALVE MODULE
AC101766
EVAPORATIVE EMISSION CANISTER
AB
AC203904
AC
EVAPORATIVE EMISSION
PURGE SOLENOID
INTAKE AIR DUCT
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-610
.
TECHNICAL DESCRIPTION
• The fuel tank may be under a slight positive and
negative pressure depending on the state of the
evaporative emission system. The PCM monitors
and responds to these pressure changes. If the
pressure varies from the specified range, the
PCM will set DTC P0455.
• The PCM energizes the evaporative emission
ventilation solenoid to shut off the evaporative
emission canister outlet port.
• The evaporative emission purge solenoid is to
apply engine manifold vacuum to the evaporative
emission system.
• When the fuel system develops a vacuum of 2
kPa (0.29 psi), the evaporative emission purge
solenoid is turned "OFF" and the fuel system vac-
uum is maintained at 2 kPa (0.29 psi).
• The PCM determines if there is a leak or clog in
the fuel system by measuring the change of vac-
uum inside the fuel tank.
• The test is stopped when fuel vapor pressure is
determined to be too high.
.
DESCRIPTIONS OF MONITOR METHODS
• Depressurizing EVAP system by intake manifold
negative pressure is impossible within specified
period.
.
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
.
AC101763 AB
REAR COIL SPRING (RH)
EVAPORATIVE EMISSION VENTILATION
SOLENOID
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