Mitsubishi Montero (2004+). Manual — part 271
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-571
STEP 10. Measure the signal voltage at PCM connector
D-134 by backprobing.
(1) Do not disconnect PCM connector D-134.
(2) Turn the ignition switch to the "ON" position.
(3) Remove the fuel cap.
(4) Measure the voltage between PCM connector D-134
terminal 82 and ground by backprobing.
• The voltage should measure between 2.0 and 3.0 volts.
(5) 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 14.
NO : Go to Step 11.
STEP 11. Check PCM connector D-134 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 12.
NO : Repair or replace the faulty component. (Refer to
GROUP 00E, Harness Connector Inspection
AC203993
CONNECTOR: D-134
AD
D-134 (GR)
PCM
AC204161
64
63
65 66 67 68
62
61
69 70 71 72 73
74 75 76 77 78 79 8081 82
83 84
85 86 87
88 89
AB
D-134 HARNESS CONNECTOR:
HARNESS SIDE
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
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-572
STEP 12. Check intermediate connectors D-112, E-111 and
F-07, and fuel tank differential pressure sensor connector
G-05 for loose, corroded or damaged terminals, or
terminals pushed back in the connector.
Q: Are the connectors and terminals in good condition?
YES : Go to Step 13.
NO : Repair or replace the faulty component. (Refer to
GROUP 00E, Harness Connector Inspection
AC203998
CONNECTOR: D-112
AC
D-112
D-112 HARNESS
CONNECTOR:
COMPONENT SIDE
38
28
16
33
22
10
31
19
7
1
18
30
29
17
5
6
21
20
32
8
2
9
25
13
3
24
23
34 35
11 12
27
26
36 37
14
4
15
AC203999
CONNECTOR: E-111
AC
E-111
E-111 HARNESS
CONNECTOR:
COMPONENT SIDE
38
12 13
11
26
14
1
20
6
23 24 25
37
31
36
30
10
9
21 22
35
8
7
34
17
29
18 19
5
4
15 16
33
28
32
27
3
2
AC204000
CONNECTOR: F-07
AC
F-07 (B)
F-07 HARNESS
CONNECTOR:
COMPONENT SIDE
8
4
3
2
1
5 6 7
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-573
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-574
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
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