Mitsubishi Montero (2004+). Manual — part 361
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-931
DIAGNOSIS
STEP 1. Check connector C-04 at transmission range
switch for damage.
Q: Is the 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.
STEP 2. Check the transmission range switch.
Refer to GROUP 23A, On-vehicle Service
− Essential Service −
Transmission Range Switch Continuity Check
.
Q: Are there any abnormalities?
YES : Go to Step 3.
NO : Repair or replace it. Then confirm that the malfunction
symptom is eliminated.
STEP 3. Measure the power supply voltage at transmission
range switch connector C-04.
(1) Disconnect the connector C-04 and measure at the harness
side.
(2) Turn the ignition switch to the "START" position.
(3) Measure the voltage between terminal No. 10 and ground.
• Voltage should be battery positive voltage.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Check connector E-10 at intermediate connector for
damage, and repair or replace as required. Refer to
GROUP 00E, Harness Connector Inspection
. If intermediate connector are in good
condition, repair harness wire between ignition switch
connector D-204 (terminal No. 5) and transmission
range switch connector C-04 (terminal No. 10)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
AK201289
3
4
5
8
9
1
2
6
7
10
AB
C-04
CONNECTOR: C-04
HARNESS
CONNECTOR:
COMPONENT SIDE
AK201289
3
4
5
8
9
1
2
6
7
10
AB
C-04
CONNECTOR: C-04
HARNESS
CONNECTOR:
COMPONENT SIDE
3
4
5
8
9
1
2
6
7
10
AK303223 AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-932
STEP 4. Check connector D-133 at PCM for damage.
Q: Is the connector in good condition?
YES : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
STEP 5. Check for open circuit and short circuit to ground
and harness damage between transmission range switch
connector C-04 (terminal No. 9) and PCM connector D-133
(terminal No. 51).
Q: Is the harness wire in good condition?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Repair it. Then confirm that the malfunction symptom
is eliminated.
AK200939
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
AK201289
3
4
5
8
9
1
2
6
7
10
AB
C-04
CONNECTOR: C-04
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200939
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
52
53
54
55
56
57
58
50
51
AB
CONNECTOR: D-133
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-133(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-933
INSPECTION PROCEDURE 31: Ignition Circuit System.
WHITE-
GREEN
WHITE-
GREEN
AK201160
BLUE-
BLA
CK
BLUE-
BLA
CK
2
IG2
ST
LOCK
ACC
IG1
2
IGNITION
SWITCH
R
5
35
87
3
31
44
POWERTRAIN
CONTROL
MODULE (PCM)
D-133
D-134
8
1
2 3
B-25X
INSPECTION
CONNECTOR
METER AND
GAUGE
3
4 5 6
1 2
D-204
3
2
4 5 6
1
D-208
MU801331
3
2
1
8
5 6 7
4
D-221
(MU801866)
Ignition Circuit
E-111
E-111
7 8
5
3 4
35
34
10 11 12
2122 23 24
13 14 15
25 26 27
16
28
17
18 19 20
29
30 31
32 33
36 37
38
9
1 2
6
61
656667686970 717273
74757677787980 8182
8384
858687
8889
62
6364
D-134
(MU803804)
31
35363738394041 42 43
444546474849
50 51
5253
545556
57 58
32
33 34
D-133
(MU803803)
B
ULE-
BLA
CK
B
ULE-
BLA
CK
B
ULE-
BLA
CK
1
1
B-34
1 2 3
B-32
1 2 3
B-31
1 2 3
YELLO
W
-PINK
BLA
CK-PINK
BLA
CK
BR
O
W
N
BLA
CK
IGNITION
COIL 1
IGNITION
COIL 3
No.4
No.1
IGNITION
COIL 2
2
2
3
No.5
No.2
No.6
No.3
1
BLA
CK
2
3
3
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-934
.
CIRCUIT OPERATION
• The ignition coil is energized by battery positive
voltage from the ignition switch.
• When the PCM turns off its internal power tran-
sistor, battery positive voltage is applied to the
ignition power transistor (terminal No. 3) inside
the ignition coil, causing the ignition power tran-
sistor to be turned on.
• If the ignition power transistor is turned on, the
primary circuit of the ignition coil is energized by
grounding the ignition coil through terminal No. 2,
causing the primary current to flow to the ignition
coil.
.
TROUBLESHOOTING HINTS (The most likely
causes for this case: )
• Malfunction of the ignition coil.
• Malfunction of the ignition power transistor.
AK201066AC
B-31(GR)
B-32(GR)
B-34(GR)
CONNECTORS: B-31, B-32, B-34
AK201038AH
CONNECTORS: D-133, D-134
PCM
D-134(GR)
D-133(GR)
AK201294
D-221
AB
CONNECTOR: D-221
AK201045
D-204
AB
CONNECTOR: D-204
AK201041AD
CONNECTOR: D-208
D-208
AK201043
E-111
AB
CONNECTOR: E-111
AK201352AB
B-25X
CONNECTOR: B-25X
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