Mitsubishi Outlander GS45X. Manual - part 956

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-757

STEP 3. Check the injector relay.
(1) Remove the injector relay.
(2) Check for continuity between the injector relay terminals 

No. 1 and No. 2.

• There should be continuity.

(3) Use jumper wires to connect injector relay terminal No. 1 to 

the positive battery terminal and terminal No. 2 to the 
negative battery terminal.

(4) Check for continuity between the injector relay terminals 

No. 3 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 4.
NO :  Replace the injector relay. Then confirm that the 

malfunction symptom is eliminated.

STEP 4. Measure the power supply voltage at injector relay 
harness side connector A-24X.
(1) Disconnect the connector A-24X and measure at the 

harness side.

(2) Measure the voltage between terminal No. 4 and ground.

• Voltage should measure battery positive voltage.

Q: Is battery positive voltage (approximately 12 volts) 

present?
YES : Go to Step 5.
NO :  Repair harness wire between MFI relay connector 

A-33X (terminal No. 2) and injector relay connector 
A-24X (terminal No. 4) because of open circuit or 
harness damage. Then confirm that the malfunction 
symptom is eliminated.

AK700509

1

2

3
4

Injector relay side connector

AB

AK700510

1

2

3
4

AB

Injector relay side connector

2

1

3
4

AK700511AB

A-24X harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-758

STEP 5. Measure the power supply voltage at injector relay 
harness side connector A-24X.
(1) Disconnect the connector A-24X 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.

(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 :  Repair harness wire between ETACS-ECU connector 

C-304 (terminal No. 10) and injector relay connector 
A-24X (terminal No. 1) because of open circuit or 
harness damage. Then confirm that the malfunction 
symptom is eliminated.

STEP 6. Check for continuity at injector relay harness side 
connector A-24X.
(1) Disconnect the connector A-24X and measure at the 

harness side.

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

ground.

• Should be less than 2 ohms.

Q: Does continuity exist?

YES : Go to Step 7.
NO :  Repair harness wire between injector relay connector 

A-24X (terminal No. 2) and ground because of open 
circuit or harness damage. Then confirm that the 
malfunction symptom is eliminated.

STEP 7. Using scan tool MB991958, check data list.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the data list. Refer to Data List 

Reference Table 

P.13B-836

.

a. Item 1: Power Supply Voltage (at cranking).

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Are they operating properly?

YES : Go to Step 8.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

AK700512

2

1

3
4

AB

A-24X harness
connector:
component side

AK700513

2

1

3
4

AB

A-24X harness
connector:
component side

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-759

STEP 8. Using scan tool MB991958, check actuator test.
(1) Turn the ignition switch to the "ON" position.
(2) Check the following items in the actuator test. Refer to 

Actuator Test Reference Table 

P.13B-858

.

a. Item 9: Fuel pump.

(3) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the actuator operating properly?

YES : Go to Step 9.
NO :  Repair or replace it. Then confirm that the malfunction 

symptom is eliminated.

STEP 9. Check the fuel pressure.
Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13B-883

.

Q: Is the fuel pressure normal?

YES : Go to Step 10.
NO :  Check the following items, and repair or replace the 

defective items.

• Insufficient fuel pump discharge.

• Fuel pump filter clogged.

STEP 10. Check the left bank injector resistance.
(1) Disconnect the left bank injector connector B-115, B-116, 

B-120.

(2) Measure the resistance between each injector side 

connector terminal No. 1 and No. 2.

Standard value: 10.5 

− 13.5 Ω [at 20°C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms 

[at 20

°C (68°F)]?

YES : Go to Step 11.
NO :  Replace the faulty injector. Then confirm that the 

malfunction symptom is eliminated.

AK700204

1 2

AB

Injector side
connector

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-760

STEP 11. Check the right bank injector resistance at 
intermediate connector B-21.
(1) Disconnect the intermediate connector B-21.
(2) Measure the resistance between each male connector side 

terminal.

a. Measure the resistance between terminal No. 6 and No. 

7 at No. 1 cylinder injector.

b. Measure the resistance between terminal No. 6 and No. 

8 at No. 3 cylinder injector.

c. Measure the resistance between terminal No. 6 and No. 

9 at No. 5 cylinder injector.

• Resistance should be between 10.5 and 13.5 ohms [at 

20

°C (68°F)].

Q: Is the measured resistance between 10.5 and 13.5 ohms 

[at 20

°C (68°F)]?

YES : Go to Step 14.
NO :  Go to Step 12.

STEP 12. Check the right bank injector resistance.
(1) Remove the intake manifold.
(2) Disconnect the right bank injector connector, which 

deviates from the standard value at Step 11.

(3) Measure the resistance between injector side connector 

terminal No. 1 and No. 2.

Standard value: 10.5 

− 13.5 Ω [at 20 °C (68°F)]

Q: Is the measured resistance between 10.5 and 13.5 ohms 

[at 20

°C (68°F)]?

YES : Go to Step 13.
NO :  Replace the injector. Then confirm that the 

malfunction symptom is eliminated.

STEP 13. Check harness connector B-101, B-103, B-104 at 
right bank injector for damage.
(1)  Check the injector connector, which deviates from the 

standard   value at Step 11.

Q: Is the harness connector in good condition?

YES : Repair harness wire between injector intermediate 

connector and right bank injector connector because 
of harness damage. 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.

AK700205

1

2 3

6

7 8

4 5

9 10

AB

B-21
Injector side
connector

AK700204

1 2

AB

Injector side
connector