Mitsubishi Montero (2004+). Manual — part 273
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-579
• To check for system blockage, do a performance
test which uses a mechanical vacuum gauge and
scan tool MB991958 set on the fuel tank differen-
tial pressure sensor (TANK PRS SNSR 73). The
mechanical gauge reading is used to verify scan
tool MB991958 reading. A comparison of the
mechanical gauge with the reading on scan tool
MB991958 will locate a problem in the system.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB cable
• MB991911: MUT-III main harness B
• MB991658: Test Harness Set
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-580
STEP 1. 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 : Go to Step 2.
AC306409AF
MB991911
MB991824
MB991827
AC102602 AC
HOSE F
ACX01358
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-581
STEP 2. Measure the signal voltage at fuel tank differential
pressure sensor connector G-05.
(1) Tumble the second seat.
(2) Remove the service hole cover (upper) and packing.
(3) Remove the service hole cover (lower) and packing.
(4) Disconnect fuel tank differential pressure sensor connector
G-05.
(5) Connect special tool MB991658 between fuel tank
differential pressure sensor connector G-05 terminals 1, 2
and 3.
(6) Turn the ignition switch to the "ON" position.
(7) Remove the fuel cap.
(8) Measure the voltage between fuel tank differential pressure
sensor connector G-05 terminal 1 and ground.
• The voltage should measure between 2.0 and 3.0 volts.
(9) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 2.0 and 3.0 volts?
YES : Go to Step 10.
NO : Go to Step 3.
STEP 3. Measure the 5-volt reference signal at fuel tank
differential pressure sensor connector G-05.
(1) Disconnect fuel tank differential pressure sensor connector
G-05.
(2) Connect special tool MB991658 between fuel tank
differential pressure sensor connector G-05 terminals 1, 2
and 3.
(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between fuel tank differential pressure
sensor connector G-05 terminal 3 and ground.
• The voltage should measure between 4.9 and 5.1 volts.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 8.
NO : Go to Step 4.
ACX00218
CONNECTOR : G-05
AS
G-05 (B)
SERVICE HOLE (UPPER)
G-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
SERVICE HOLE (LOWER)
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
ACX00218
CONNECTOR : G-05
AR
G-05 (B)
SECOND SEAT UNDER
SERVICE HOLE
G-05 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
AC002081AB
MB991658
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-582
STEP 4. Measure the 5-volt reference signal at PCM
connector D-135 by backprobing.
(1) Do not disconnect PCM connector D-135.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between PCM connector D-135
terminal 97 and ground by backprobing.
• The voltage should measure between 4.9 and 5.1 volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.9 and 5.1 volts?
YES : Go to Step 6.
NO : Go to Step 5.
STEP 5. Check PCM connector D-135 for loose, corroded
or damaged terminals, or terminals pushed back in the
connector.
Q: Are the connector and terminals in good condition?
YES : Go to Step 14.
NO : Repair or replace the faulty component. (Refer to
GROUP 00E, Harness Connector Inspection
AC203993
CONNECTOR: D-135
AC
D-135 (GR)
PCM
94
93
95
96 97 98 99 100
92
91
101 102 103
104
105 106
107 108 109
110 111 112
113 114
115 116 117
118 119 120
AC204160 AB
D-135 HARNESS CONNECTOR:
HARNESS SIDE
AC203997
CONNECTOR: D-135
AB
D-135 (GR)
PCM
D-135 HARNESS CONNECTOR:
HARNESS SIDE
94
93
95
96 97 98 99 100
92
91
101 102103
104
105 106
107 108 109
110 111 112
113 114
115 116 117
118 119 120
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