Mitsubishi Outlander GS45X. Manual - part 988

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-885

CAUTION

To prevent damage to scan tool MB991958, always turn the 
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
5. Connect scan tool MB991958 to the data link connector.
6. Turn the ignition switch to the ON position (But do not start 

the engine).

7. Use Actuator test "item number 9" to drive the fuel pump. 

Check that there is no fuel leaking from any section when 
the fuel pump is operating.

8. Finish the actuator test or turn the ignition switch to the 

LOCK (OFF) position.

9. Start the engine and run at idle.
10.Measure fuel pressure while the engine is running at idle.

Standard value: Approximately 324 kPa (47 psi) at 
curb idle

11.Check to see that fuel pressure at idle does not drop even 

after the engine has been revved several times.

12.If any of fuel pressure measured in Step 10 to 11 is out of 

specification, troubleshoot and repair according to the table 
below.

13.Stop the engine and observe fuel pressure gauge reading. It 

is normal if the reading does not drop within 2 minutes. If it 
does, observe the rate of drop and troubleshoot and repair 
according to the table below. Start, then stop the engine.

(1) Squeeze the fuel supply line closed to confirm leak-down 

occurs from defective fuel pump check valve.

(2) If pressure continues to drop with both fuel lines 

squeezed closed, injector(s) are leaking.

14.Release residual pressure from the fuel pipe line. (Refer to 

Fuel Pump Connector Disconnection (How To Reduce 
Pressurized Fuel Lines) 

P.13B-886

.)

SYMPTOM

PROBABLE CAUSE

REMEDY

• Fuel pressure too low

• Fuel pressure drops after 

revving

Clogged fuel filter

Replace fuel filter

Fuel leaking to return side due to 
poor fuel regulator valve seating 
or settled spring

Replace fuel pressure regulator

Low fuel pump delivery pressure Replace fuel pump

Fuel pressure too high

Binding valve in fuel pressure 
regulator

Replace fuel pressure regulator

SYMPTOM

PROBABLE CAUSE

REMEDY

Fuel pressure drops gradually 
after engine is stopped

Leaky injector

Replace injector

Leaky fuel regulator valve seat Replace fuel pressure regulator

Fuel pressure drops sharply 
immediately after engine is 
stopped

Check valve in fuel pump is 
held open

Replace fuel pump

AK700568AB

MB991824

MB991827

MB991910

Data link
connector

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-886

WARNING

To prevent a fire, cover the hose connection with 
shop towels to prevent splash of fuel that could be 
caused by some residual pressure in the fuel pipe 
line.

15.Remove the fuel pressure gauge and special tool from the 

fuel rail.

16.Fit the fuel high-pressure hose to the fuel rail.
17.Check for fuel leaks.

(1) Use scan tool MB991958 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.

18.Disconnect scan tool MB991958.

FUEL PUMP CONNECTOR DISCONNECTION 
(HOW TO REDUCE PRESSURIZED FUEL LINES)

M1131000901948

The service procedure is the same as the vehicles with 2.4L 
engine (Refer to GROUP 13A, On-vehicle Service 

P.13A-866

).

FUEL TANK PUMP OPERATION CHECK

M1131002002289

The service procedure is the same as the vehicles with 2.4L 
engine (Refer to GROUP 13A, On-vehicle Service 

P.13A-867

).

MULTIPORT FUEL INJECTION (MFI) RELAY 
CONTINUITY CHECK

M1131050001229

Inspect the MFI relay for continuity in accordance with the chart 
shown below.

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 

− 3

Supplied

1 

− 3

2 

− 4

1

3

2

4

1

3

2

4

AK703916

MFI relay
side connector

MFI relay
side connector

AB

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-887

FUEL PUMP RELAY CONTINUITY CHECK

M1131033001226

Inspect the fuel pump relay for continuity in accordance with 
the chart shown below.

BATTERY 
VOLTAGE

TERMINAL 
NO. TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. TO 
BE CONDUCTED

Supplied

6 (Connector 
"A") 

− 11 

(Connector 
"B") 

1 (Connector "C") 

− 

1 (Connector "D") 

AK700095AB

ETACS-ECU

Connector “A”

Connector “B”

Connector “D”

Connector “C”

1 2 3 4

5 6 7

8 9 10 11

131415

12

1 2

1 2

1

6

4

5

9

8

10 11

13

15

14

12

16

7

2 3

AK703917AB

Etacs-ECU side connector

Connector "D"

Connector "C"

Connector "B"

Connector "A"

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.0L ENGINE>

13B-888

INJECTOR RELAY AND THROTTLE ACTUATOR 
CONTROL MOTOR RELAY CONTINUITY CHECK

M1131054700023

Inspect the Injector relay and throttle actuator control motor 
relay for continuity in accordance with the chart shown below.

INTAKE AIR TEMPERATURE SENSOR CHECK

M1131002801419

1. Disconnect the mass airflow sensor connectors.
2. Measure resistance between terminals 1 and 4.

Standard value:

13 

− 17 kΩ [at -20°C (-4°F)]

5.3 

− 6.7 kΩ [at 0°C (32°F)]

2.3 

− 3.0 kΩ [at 20°C (68°F)]

1.0 

− 1.5 kΩ [at 40°C (104°F)]

0.56 

− 0.76 kΩ [at 60°C (140°F)]

0.30 

− 0.45 kΩ [at 80°C (176°F)]

3. If not within specifications, replace the mass airflow sensor.

4. Measure resistance while heating the sensor using a hair 

dryer.

Normal condition:

5. If resistance does not decrease as heat increases, replace 

the mass airflow sensor.

BATTERY 
VOLTAGE

TERMINAL NO. 
TO BE 
CONNECTED 
TO BATTERY

TERMINAL NO. 
TO BE 
CONDUCTED

Not supplied

−

1 

− 2

Supplied

1 

− 2

3 

− 4

AK703918

1

2

3
4

1

2

3
4

AB

Injector relay or 
throttle actuator
control motor relay
side connector

Injector relay or throttle actuator
control motor relay side connector

TEMPERATURE

RESISTANCE (k

Ω)

Higher

Smaller

1

2

3 4

AK700097AB

Intake air temperature
sensor connector

AK700098 AB

Intake air
temperature
sensor