Mitsubishi Lancer Evolution X. Manual — part 428

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-777

STEP 10. Measure the power supply voltage at ECM
connector B-09.
(1) Disconnect the connector B-09 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 51 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 13.
NO : Go to Step 11.

STEP 11. Check for open circuit and short circuit to ground
between fuel pump relay 1 connector A-27X (terminal No.
1) and ECM connector B-09 (terminal No. 51).
NOTE: Check harness after checking intermediate connector
A-13. If intermediate connector is damaged, repair or replace it.
Refer to GROUP 00E, Harness Connector Inspection

P.00E-2

.

Then check that the malfunction is eliminated.
Q: Is the harness wire in good condition?

YES : Go to Step 12.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 12. Check harness connector A-34X at MFI relay for
damage.
Q: Is the connector in good condition?

YES : Repair harness wire between fuel pump relay 1

connector (terminal No. 2) and MFI relay connector
(terminal No. 2) because of open circuit. Then confirm
that the malfunction symptom is eliminated.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

AK704358

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1

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AB

B-09 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-778

STEP 13. Check harness connector D-22 at fuel pump for
damage.
Q: Is the connector in good condition?

YES : Go to Step 14.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

STEP 14. Check the fuel pump operation.
(1) Disconnect fuel pump connector D-22.
(2) Use jumper wire to connect fuel pump terminal No. 5 to the

positive battery terminal and terminal No. 4 the negative
battery terminal.

• An operating sound of the fuel pump should be heard.

Q: Is the fuel pump operating properly?

YES : Go to Step 15.
NO : Replace the fuel pump. Then confirm that the

malfunction symptom in eliminated.

STEP 15. Check for continuity at fuel pump harness side
connector D-22.
(1) Disconnect the connector D-22 and measure at he harness

side.

(2) Check for the continuity between terminal No. 4 and

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 16.
NO : Repair harness wire between fuel pump connector

D-22 (terminal No. 4) and ground because of open
circuit and harness damage. Then confirm that the
malfunction symptom is eliminated.

AK604050

1 2 3

4 5

AB

Fuel pump side
connector

AK604051

1

2

3

4

5

AC

D-22 harness connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-779

STEP 16. Measurement power supply voltage at fuel pump
relay harness side connector D-22.
(1) Disconnect the connector D-22 and measure at the

harness side.

(2) Disconnect the ECM connector B-10, and connect terminal

No. 73 and No. 96 to ground using a jumper wire.

(3) Turn the ignition switch to the "ON" position.
(4) Measure the voltage between terminal No. 5 and ground.

• Voltage should be battery positive voltage.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 22.
NO : Go to Step 17.

STEP 17. Check for open circuit and short circuit to
ground between fuel pump connector D-22 (terminal No. 5)
and ETACS-ECU connector C-314 (terminal No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 18.
NO : Repair or replace it. Then confirm that the

malfunction symptom is eliminated.

STEP 18. Check for open circuit and short circuit to
ground between fuel pump circuit resistor connector A-58
(terminal No. 2) and ETACS-ECU connector C-307 (terminal
No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 19.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 19. Check harness connector A-34X at MFI relay for
damage.
Q: Is the connector in good condition?

YES : Go to Step 20.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then confirm that the

malfunction symptom is eliminated.

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100

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106

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114

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107

110

111

115

116

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118

AK704362 AB

B-10 harness
connector:
component side

AK704363

1

2

3

4

5

AB

D-22 harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-780

STEP 20. Check for open circuit and short circuit to
ground between MFI relay connector A-34X (terminal No.
2) and fuel pump circuit resistor connector A-58 (terminal
No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 21.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 21. Check for short circuit to ground between fuel
pump relay 1 connector A-27X (terminal No. 3) and
ETACS-ECU connector C-307 (terminal No. 1).
Q: Is the harness wire in good condition?

YES : Go to Step 22.
NO : Repair or replace it. Then confirm that the malfunction

symptom is eliminated.

STEP 22. Measurement power supply voltage at
ETACS-ECU harness side connector C-307.
(1) Disconnect the connector C-307 and measure at the

harness side.

(2) Disconnect the ECM connector B-09, and connect terminal

No. 51 to ground using a jumper wire.

(3) Disconnect the ECM connector B-10, and connect terminal

No. 73 to ground using a jumper wire.

(4) Turn the ignition switch to the "ON" position.
(5) Measure the voltage between terminal No. 1 and ground.

• Voltage should be battery positive voltage.

(6) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is battery positive voltage (approximately 12 volts)

present?
YES : Go to Step 27.
NO : Go to Step 23.

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101

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106

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113

114

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107

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111

115

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117

118

AK704639

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1

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AB

B-10 harness connector:
component side

B-09 harness connector:
component side

AK704640

1

2

C-307 harness
connector:
component side

AB