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.

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4

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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 

P.00E-2

. 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.

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4

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3

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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 

P.00E-2

. 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

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2

3

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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 

P.00E-2

. 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

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1

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3

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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

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1

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3

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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