Mitsubishi Montero (2004+). Manual — part 337
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-835
.
CIRCUIT OPERATION
• A diagnostic output is made from the PCM (termi-
nal No. 74) to the diagnostic output terminal (ter-
minal No. 7) of the data link connector.
.
COMMENT
• No power supply to PCM.
• Defective ground circuit of PCM.
• Defective PCM.
• Improper communication line between PCM and
scan tool.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Malfunction of PCM power supply circuit.
• Malfunction of the PCM.
• Open or shorted circuit between PCM and data
link connector.
DIAGNOSIS
STEP 1. Check harness connector D-134 at PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK201043
E-111
AB
CONNECTOR: E-111
AK304351
D-08
CONNECTOR: D-08
AD
AK201044
D-29
AB
CONNECTOR: D-29
AK201166
61
62
63
64
65
66
67
68
69
70
71
76
77
78
79
85
86
87
80
72
73
74
75
81
82
83
84
88
89
CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-836
STEP 2. Check for open circuit, short circuit to ground and
harness damage between data link connector D-118
(terminal No. 7) and PCM connector D-134 (terminal No.
74).
NOTE: Check harness after checking intermediate connectors
D-29, D-08 and E-111. If intermediate connector D-29, D-08
and E-111 are damaged, repair or replace them. Refer to
GROUP 00E, Harness Connector Inspection
check that the malfunction is eliminated.
Q: Is the harness wire in good condition?
YES : Refer to INSPECTION PROCEDURE 28
− Power
Supply System and Ignition Switch-IG System
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AK201285
1 2 3 4 5 6
12
11
10
1516
14
13
9
7 8
AB
D-118(B)
CONNECTOR: D-118
HARNESS CONNECTOR:
COMPONENT SIDE
AK201166
61
62
63
64
65
66
67
68
69
70
71
76
77
78
79
85
86
87
80
72
73
74
75
81
82
83
84
88
89
CONNECTOR: D-134
AB
PCM
D-134(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-837
INSPECTION PROCEDURE 3: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Does Not Illuminate Right after the Ignition Switch Is Turned to the "ON" Position.
AK201154
RED-
WHITE
RED-
WHITE
BLA
CK-
WHITE
BLUE-
BLA
C
K
14
7
38
37 38
39
40
43
41 42
44
47
45 46
32
31
33 34 35 36
D-04
62
1
2
2
R
IG2
ST
LOCK
ACC
IG1
IGNITION
SWITCH
MALFUNCTION INDICATOR LAMP
SERVICE ENGINE SOON
OR CHECK ENGINE LAMP
POWERTRAIN
CONTROL
MODULE (PCM)
3
4 5 6
1 2
D-204
5 6
1
3
2
4
D-208
MU801331
9
6
10
17
18
29
2
3 4
7 8
19 20
30 31
12
11
24
33 34 35
21
32
27
26
36 37
28
38
25
13
15
14
16
23
22
1
5
E-111
53 54 55 56 57 58
59
60
63
61 62
64
67
65 66
52
51
D-03
13
3
5
7
12
9
1
6
8
11
10
2
4
D-210
(MU801860)
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit
(
)
1
2
3
5
6 7 8 9
4
20
21 22
232425
2627
10111213
14 15
16 1718
19
D-132
(MU803802)
6
10A
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-838
.
CIRCUIT OPERATION
• The malfunction indicator lamp (service engine
soon or check engine lamp) power is supplied
from the ignition switch.
• The PCM controls the ground of the malfunction
indicator lamp (service engine soon or check
engine lamp) by turning the power transistor in
the PCM ON and OFF.
.
COMMENT
• The PCM causes the malfunction indicator lamp
(service engine soon or check engine lamp) to
illuminate for 20 seconds immediately after the
ignition switch is turned to the "ON" position
occurred.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Burnt-out bulb.
AK304351
D-03(GR)
CONNECTOR: D-03
AB
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201045
D-204
AB
CONNECTOR: D-204
AK201041AC
CONNECTOR: D-210
D-210
AK304351
D-04(GR)
CONNECTOR: D-04
AC
AK201041AD
CONNECTOR: D-208
D-208
AK201043
E-111
AB
CONNECTOR: E-111
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