Mitsubishi Montero Sport (2004+). Manual — part 328
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-725
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, check data list item 16:
Power Supply Voltage.
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) Set scan tool MB991958 to the data reading mode for item
16, Power Supply Voltage.
• 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 2.
NO : Refer to INSPECTION PROCEDURE 28
− Power
Supply System and Ignition Switch-IG System
STEP 2. Check the burned-out bulb.
Q: Is the valve normal?
YES : Go to step 3.
NO : Replace the bulb. Then confirm that the malfunction
symptom is eliminated.
STEP 3. Check harness connector C-04 at the combination
meter for damage.
Q: Is the harness connector in good condition?
YES : Go to step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK303629AB
MB991911
MB991827
MB991824
16-PIN
AK200041
22 21
23
24
25
26
27
28
29
30
31
32
AB
CONNECTOR: C-04
C-04
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-726
STEP 4. Measure the power supply voltage at combination
meter harness side connector C-04.
(1) Disconnect the connector C-04 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 24 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 5.
NO : Check harness connectors D-06 and D-08 at
intermediate connector for damage, and repair or
replace as required. Refer to GROUP 00E, Harness
Connector Inspection
. If intermediate
connectors D-06 and D-08 are in good condition,
repair it because of open circuit between ignition
switch connector D-15 (terminal No. 2) and
combination meter connector C-04 (terminal No. 24).
Then confirm that the malfunction symptom is
eliminated.
STEP 5. Check harness connector C-89 at the PCM for
damage.
Q: Is the harness connector in good condition?
YES : Go to Step 6.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then confirm that the
malfunction symptom is eliminated.
AK200041
22 21
23
24
25
26
27
28
29
30
31
32
AB
CONNECTOR: C-04
C-04
HARNESS CONNECTOR:
COMPONENT SIDE
AK303789
31
32
30 29 28
27 26 25 24 23 22 21
C-04 HARNESS
CONNECTOR:
COMPONENT SIDE
AB
AK103914
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
CONNECTOR: C-89
C-89(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-727
STEP 6. Measure the power supply voltage at PCM
connector C-89.
(1) Disconnect the connector C-89 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 22 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 : Replace the PCM. Then confirm that the malfunction
symptom is eliminated.
NO : Check harness connector C-16 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector C-16 is
in good condition, repair an open circuit between
combination meter connector C-04 (terminal No. 23)
and PCM connector C-89 (terminal No. 22). Then
confirm that the malfunction symptom is eliminated.
AK103914
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
19
20
30
21
22
23
24
25
26
27
28
29
31
32
33
34
35
1
10
AB
CONNECTOR: C-89
C-89(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01508AI
C-89 HARNESS CONNECTOR:
COMPONENT SIDE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-728
INSPECTION PROCEDURE 4: The Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check
Engine Lamp) Remains Illuminated and Never Goes Out.
GREEN-
WHITE
AK302270
Malfunction Indicator Lamp (SERVICE ENGINE SOON or Check Engine Lamp) Circuit
BL
ACK
-
WHITE
BL
ACK
-
WHITE
GREEN-
WHITE
9
23
22
8
4
2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
1
D-06
D-06
D-08
JUNCTION
BLOCK
ST
LOCK
ACC
IG1
R
2
1
3
2
4
D-08
(MU801342)
1 2 3
4 5 6
D-15
IGNITION
SWITCH
22
21
23 24 25 26 27
28 29 30 31 32
C-04
Malfunction Indicator Lamp
(SERVICE ENGINE SOON or
Check Engine Lamp)
POWERTRAIN CONTROL
MODULE (PCM)
24
IG2
1 2 3 4 5
6 7 8 9 10
11 12 13 14 15 16 17 18 19 20 21 22
C-16
MU801461
10
2
3 4
5 6
7 8
9
11 12 13 14 15 16 17 18 19 20
30
21 22 23
24
25
26 27 28 29
31 32 33
34 35
1
C-89
(MU803784)
10A
8
AK103912AD
CONNECTOR: C-04
C-04
AK103911AE
CONNECTOR: C-16
C-16
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