Mitsubishi Montero Sport (2004+). Manual — part 348
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-805
.
CIRCUIT OPERATION
• Battery positive voltage is applied to the MFI
relay (terminals No. 3, No. 4).
• When the ignition switch is turned to the "ON"
position, the battery positive voltage is applied to
the PCM (terminal No. 98).
• When the battery positive voltage is applied, the
PCM turns the power transistor in the PCM "ON"
and grounds the MFI relay coil. With this, the MFI
relay turns "ON" and the battery positive voltage
is supplied to the PCM (terminals No. 41, No. 47)
from the MFI relay (terminal No. 1).
• Battery positive voltage is constantly supplied to
the PCM (terminal No. 66) as the backup power.
• The PCM (terminals No. 42, No. 48) is grounded
to the vehicle body.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Malfunction of the ignition switch.
• Malfunction of the MFI relay.
• Improper connector contact, open circuit or
short-circuited harness wire.
• Disconnected PCM ground wire.
• Malfunction of the PCM.
AK201000
MFI RELAY
CONNECTOR: C-59
AB
C-59
AK200040AB
CONNECTOR: D-15
D-15(B)
AK103911AB
CONNECTOR: C-14
C-14
AK103738AE
CONNECTORS: C-90, C-91
PCM
C-91(GR)
C-90(GR)
AK200035AB
CONNECTOR: D-08
D-08
JUNCTION BLOCK
(REAR SIDE)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-806
DIAGNOSIS
STEP 1. Check harness connector C-59 at MFI relay 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.
STEP 2. Check the MFI relay
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminal No. 2
and No. 4.
• There should be continuity (approximately 70 ohms)
(3) Use jumper wires to connect MFI relay terminal No. 4 to the
positive battery terminal and terminal No. 2 to the negative
battery terminal.
(4) Check for continuity between the MFI relay terminal No. 1
and No. 3 while connecting and disconnecting the jumper
wire at the negative battery terminal.
• Should be less than 2 ohms. (Negative battery terminal
connected)
• Should be open loop. (Negative battery terminal discon-
nected)
(5) Install the MFI relay.
Q: Is the measured voltage within the specified range?
YES : Go to Step 3.
NO : Replace the MFI relay. Then confirm that the
malfunction symptom is eliminated.
AK200023
2 1
3
4
CONNECTOR: C-59
AB
C-59
HARNESS
CONNECTOR:
COMPONENT
SIDE
AK200023
2 1
3
4
CONNECTOR: C-59
AB
C-59
HARNESS
CONNECTOR:
COMPONENT
SIDE
AK200198
1
2
3
4
MFI RELAY SIDE
CONNECTOR
AB
AK200199
1
2
3
4
MFI RELAY SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-807
STEP 3. Measure the power supply voltage at MFI relay
harness side connector C-59.
(1) Disconnect the connector C-59 and measure at the harness
side.
(2) Measure the voltage between terminals No. 3, No. 4 and
ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 4.
NO : Repair harness wire between fusible link (12) and MFI
relay connector C-59 (terminals No. 3, No. 4). Then
confirm that the malfunction symptom is eliminated.
STEP 4. Check harness connector C-91 at PCM for
damage.
Q: Is the harness 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.
AK200023
2 1
3
4
CONNECTOR: C-59
AB
C-59
HARNESS
CONNECTOR:
COMPONENT
SIDE
2 1
3
4
AK200197
C-59 HARNESS
CONNECTOR:
COMPONENT SIDE
AK200197AD
AK104028
98
78
71
88
89
76
77
72
79
91
73
80
74
75
81
92
82
83
93
84
85
94
86
87
95
96
90
97
AB
CONNECTOR: C-91
C-91(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-808
STEP 5. Measure the ignition switch-IG signal voltage at
PCM harness side connector C-91.
(1) Disconnect the connector C-91 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 98 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 6.
NO : Check harness connector D-08 at intermediate
connector for damage, and repair or replace as
required. Refer to, GROUP 00E, Harness Connector
Inspection
. If intermediate connectors D-08
is in good condition, repair harness wire between
ignition switch connector D-15 (terminal No. 2) and
PCM connector C-91 (terminal No. 98). Then confirm
that the malfunction symptom is eliminated.
AK104028
98
78
71
88
89
76
77
72
79
91
73
80
74
75
81
92
82
83
93
84
85
94
86
87
95
96
90
97
AB
CONNECTOR: C-91
C-91(GR)
HARNESS CONNECTOR:
COMPONENT SIDE
AKX01435
71
72
73
74
78
79
80
81
90
91
82
83
93
94
92
84
85
86
95
96
87
88
89
75
76
77
97
98
C-91 HARNESS
CONNECTOR:
COMPONENT SIDE
AP
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