Mitsubishi Montero Sport (2004+). Manual — part 349
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-809
STEP 6. Measure the backup power supply voltage at PCM
harness side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness
side.
(2) Measure the voltage between terminal No. 66 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 7.
NO : Repair harness wire between fusible link (12) and
PCM connector C-90 (terminal No. 66). Then confirm
that the malfunction symptom is eliminated.
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01436
41
42
43
47
48
49
58
59
50
51
60
61
52
62
53
54
63
64
55
56
57
44
45
46
65
66
C-90 HARNESS
CONNECTOR:
COMPONENT SIDE
BA
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-810
STEP 7. Check for continuity at PCM harness side
connector C-90.
(1) Disconnect the connector C-90 and measure at the harness
side.
(2) Check for the continuity between terminals No. 42, No. 48
and ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 8.
NO : Repair harness wire between PCM connector C-90
(terminals No. 42, No. 48) and ground. Then confirm
that the malfunction symptom is eliminated.
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01437
41
42
43
47
48
49
58
59
50
51
60
61
52
62
53
54
63
64
55
56
57
44
45
46
65
66
C-90 HARNESS
CONNECTOR:
COMPONENT SIDE
AT
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-811
STEP 8. Measure the power supply voltage at PCM harness
side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness
side.
(2) Measure the voltage between terminal No. 49 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 9.
NO : Repair harness wire between MFI relay connector
C-59 (terminal No. 2) and PCM connector C-90
(terminal No. 49). Then confirm that the malfunction
symptom is eliminated.
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AK000379AH
C-90 HARNESS
CONNECTOR:
COMPONENT SIDE
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-812
STEP 9. Measure the power supply voltage at PCM harness
side connector C-90.
(1) Disconnect the connector C-90 and measure at the harness
side.
(2) Using a jumper wire, connect terminal No. 49 to ground.
(3) Measure the voltage between terminals No. 41, No. 47 and
ground.
• Voltage should be battery positive voltage.
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-14 at intermediate
connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection
. If intermediate connector C-14 is
in good condition, repair harness wire between MFI
relay connector C-59 (terminal No. 1) and PCM
connector C-90 (terminals No. 41, No. 47). Then
confirm that the malfunction symptom is eliminated.
AK103762
42
43
48
49
50
51
52
53
54
55
56
57
46 45 44
58
59
60
61
62
63
64
65
66
47
41
AB
CONNECTOR: C-90
C-90(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01438
41
42
43
47
48
49
58
59
50
51
60
61
52
62
53
54
63
64
55
56
57
44
45
46
65
66
C-90 HARNESS
CONNECTOR:
COMPONENT SIDE
AT
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