Mitsubishi Eclipse. Manual — part 341
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-857
STEP 3. Check the fuel pump relay 1 and 2.
(1) Remove the fuel pump relay.
(2) Check for continuity between the fuel pump relay terminals
No. 2 and No. 3.
• There should be continuity. (approximately 70 ohms)
(3) Use jumper wires to connect fuel pump relay terminal No. 3
to the positive battery terminal and terminal No. 2 to the
negative battery terminal.
(4) Check the continuity between the fuel pump relay terminals
No. 1 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 fuel pump relay.
Q: Is the resistance normal?
YES : Go to Step 4.
NO : Replace the fuel pump relay. Then confirm that the
malfunction symptom is eliminated.
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300456
2 1
3
4
2 1
3
4
CONNECTORS: C-105, 107
C-105
C-107
AB
C-107 HARNESS CONNECTOR:
COMPONENT SIDE
C-105 HARNESS CONNECTOR:
COMPONENT SIDE
AK103837
2
3 4
1
FUEL PUMP
RELAY SIDE
CONNECTOR
AB
AK103838
1 2
3 4
1 2
3 4
FUEL PUMP
RELAY SIDE
CONNECTOR
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-858
STEP 4. Measure the power supply voltage at fuel pump
relay 1 harness side connector C-107.
(1) Disconnect the connector C-107 and measure at the
harness side.
(2) Measure the voltage between terminal No. 4 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 5.
NO : Check harness connectors C-89 and C-112 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 relay box (24) and fuel pump relay 1
connector C-107 (terminal No. 4) because of open
circuit. Then confirm that the malfunction symptom is
eliminated.
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300745
CONNECTOR: C-107
AB
C-107
AK103736
1
2
3
4
1
2
3
4
C-107 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AK
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-859
STEP 5. Measure the power supply voltage at fuel pump
relay 1 harness side connector C-107.
(1) Disconnect the connector C-107 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 3 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 C-111 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 ignition
switch connector C-87 (terminal No. 2) and fuel pump
relay 1 connector C-107 (terminal No. 3) because of
open circuit. Then confirm that the malfunction
symptom is eliminated.
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300745
CONNECTOR: C-107
AB
C-107
AK101347
1
2
3
4
C-107 HARNESS
CONNECTOR:
COMPONENT SIDE
AW
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <2.4L>
13A-860
STEP 6. Check the continuity at fuel pump relay 1 harness
side connector C-107.
(1) Disconnect the connector C-107 and measure at the
harness side.
(2) Check for the continuity between terminal No. 2 and
ground.
• Should be less than 2 ohms.
Q: Is the continuity normal?
YES : Go to Step 7.
NO : Check harness connector C-101 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 fuel
pump relay 1 connector C-107 (terminal No. 2) and
ground because of open circuit. Then confirm that the
malfunction symptom is eliminated.
STEP 7. Measure the power supply voltage at fuel pump
relay 2 harness side connector C-105.
(1) Disconnect the connector C-105 and measure at the
harness side.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 1 and ground.
• Voltage should be battery positive voltage.
Q: Is battery positive voltage (approximately 12 volts)
present?
YES : Go to Step 8.
NO : Repair harness wire between fuel pump relay 1
connector C-107 (terminal No. 1) and fuel pump relay
2 connector C-105 (terminal No. 1) because of open
circuit. Then confirm that the malfunction symptom is
eliminated.
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300745
CONNECTOR: C-107
AB
C-107
AK103839
1
2
3
4
1
2
3
4
C-107 HARNESS
CONNECTOR:
COMPONENT SIDE
AI
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
AK300746
CONNECTOR: C-105
AB
C-105
AK101349
1
2
3
4
C-105 HARNESS
CONNECTOR:
COMPONENT SIDE
1
2
3
4
AS
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