Mitsubishi Montero (2004+). Manual — part 339
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-843
INSPECTION PROCEDURE 4: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Remains Illuminated and Never Goes Out.
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-844
.
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
• In cases such as the above, the cause is proba-
bly that the PCM is detecting a problem in a sen-
sor or actuator, or that one of the malfunctions
listed at right has probably occurred.
.
AK304351
D-03(GR)
CONNECTOR: D-03
AB
AK201038
CONNECTOR: D-132
AB
PCM
D-132(GR)
AK201041AD
CONNECTOR: D-208
D-208
AK201041AC
CONNECTOR: D-210
D-210
AK304351
D-04(GR)
CONNECTOR: D-04
AC
AK201045
D-204
AB
CONNECTOR: D-204
AK201043
E-111
AB
CONNECTOR: E-111
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-845
TROUBLESHOOTING HINTS (The most likely
causes for this case:)
• Short-circuit between the malfunction indicator
lamp (service engine soon or check engine lamp)
and PCM.
• Malfunction of the PCM.
DIAGNOSIS
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
STEP 1. Using scan tool MB991958, read the diagnostic
trouble code (DTC).
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) Turn the ignition switch to the "ON" position.
(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the DTC set?
YES : Refer to Diagnostic Trouble Code Chart
NO : Go to Step 2.
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-846
STEP 2. Check the continuity at combination meter
harness side connector D-04.
(1) Disconnect the connector D-04 and measure at the harness
side.
(2) Disconnect the PCM connector D-132.
(3) Check for the continuity between terminal No. 38 and
ground.
• Should be open loop.
Q: Does continuity exist?
YES : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Check harness connector E-111 at the intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connectors E-111
is in good condition, repair a short circuit to ground
between combination meter connector D-04 (terminal
No. 38) and PCM connector D-132 (terminal No. 7).
Then confirm that the malfunction symptom is
eliminated.
AK304355
37
38
39
40
43
41
42
44
47
45
46
32 31
33
34
35
36
D-04(GR)
CONNECTOR: D-04
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
AK200938
2
3
4
5
6
7
8
9
1
10
14
15
16
17
18
19
20
21
22
23
24
25
26
27
11
12
13
AB
CONNECTOR: D-132
HARNESS CONNECTOR:
COMPONENT SIDE
PCM
D-132(GR)
AK201373
37
38
39
40
43
41
42
44
47
45
46
32 31
33
34
35
36
D-04 HARNESS
CONNECTOR:
COMPONENT SIDE
AK201373AB
37
38
39
40
43
41
42
44
47
45
46
32 31
33
34
35
36
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