Mitsubishi Outlander GS45X. Manual — part 968
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-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, battery positive voltage is applied to the
ECM (terminal No. 92). When battery positive
voltage is applied, the ECM turns the power tran-
sistor in the ECM "ON" and grounds the MFI relay
coil. With this, the MFI relay turns "ON" the bat-
tery positive voltage is supplied to the ECM (ter-
minals No. 82) from the MFI relay (terminal No.
2).
• A battery positive voltage is constantly supplied
to the ECM (terminal No. 104) as the backup
power.
• The ECM (terminals No. 81, No. 93) is grounded
to the vehicle body.
.
COMMENT
• When the ignition switch "ON" signal is input into
the ECM via ETACS-ECU, the ECM turns "ON"
the MFI relay. This causes battery positive volt-
age to be supplied to the ECM, sensor and actua-
tor.
.
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-circuit harness wire.
• Malfunction of the ECM.
AKA00835
Connector: A-66
A-66 (GR)
AB
AK900601
Connector: C-210
C-210
AB
AK700402AB
ECM
B-11 (GR)
Connector: B-11
AK700414 AB
ETACS-ECU
C-317
Connectors: C-304, C-317
C-304
AK700399AB
MFI relay
A-33X
Connector: A-33X
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-806
DIAGNOSIS
STEP 1. Check harness connector A-33X at MFI relay and
harness connector B-11 at ECM 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 MFI relay.
(1) Remove the MFI relay.
(2) Check for continuity between the MFI relay terminals No. 1
and No. 3.
• There should be continuity.
(3) Use jumper wires to connect MFI relay terminal No. 3 to the
positive battery terminal and terminal No. 1 to the negative
battery terminal.
(4) Check for continuity between the MFI relay terminals No. 2
and No. 4 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 resistance within the specified range?
YES : Go to Step 3.
NO : Replace the MFI relay. Then confirm that the
malfunction symptom is eliminated.
AK703903
1
3
2
4
AB
MFI relay side
connector
1
3
2
4
AK703904AB
MFI
relay side
connector
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-807
STEP 3. Measure the power supply voltage at MFI relay
harness side connector A-33X.
(1) Disconnect the connector A-33X 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 (36) and MFI
relay connector A-33X (terminal No. 3, No. 4)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 4. Measure the ignition switch-IG signal voltage at
ECM harness side connector B-11.
(1) Disconnect the connector B-11 and measure at the harness
side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 92 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 C-304 and C-317 at
intermediate connector for damage, and repair or
replace as required. Refer to, GROUP 00E, Harness
Connector Inspection
. If intermediate
connectors are in good condition, repair harness wire
between ignition switch connector C-210 (terminal
No. 2) and ECM connector B-11 (terminal No. 92)
because of open circuit. Then confirm that the
malfunction symptom is eliminated.
AK704114
3
1
2
4
AB
A-33X harness
connector:
component side
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AK700211AB
B-11 harness
connector:
component side
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>
13B-808
STEP 5. Measure the backup power supply voltage at ECM
harness side connector B-11.
(1) Disconnect the connector B-11 and measure at the harness
side.
(2) Measure the voltage between terminal No. 104 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 6.
NO : Repair harness wire between relay box (fuse 2) and
ECM connector B-11 (terminal No. 104) because of
short circuit. Then confirm that the malfunction
symptom is eliminated.
STEP 6. Check for continuity at ECM harness side
connector B-11.
(1) Disconnect the connector B-11 and measure at the harness
side.
(2) Check for the continuity between terminals (No. 81, No. 93)
and ground.
• Should be less than 2 ohms.
Q: Does continuity exist?
YES : Go to Step 7.
NO : Check harness connector A-66 at intermediate
connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection
. If intermediate connector is in
good condition, repair harness wire between ECM
connector B-11 (terminal No. 81, No. 93) and ground
because of open circuit and harness damage. Then
confirm that the malfunction symptom is eliminated.
AK700212
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AB
Special tool 48-pin
connector:
component side
82 81 80 79 78 77 76 75 74 73 72 71
94 93 92 91 90 89 88 87 86 85 84 83
99 98 97 96 95
100
101
102
103
104
105
106
112
113
114
109 108
107
110
111
115
116
117
118
AK703905 AB
B-11 harness
connector:
component side
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