Mitsubishi Galant (2004+). Manual - part 1072

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1105

<When using the fuel pressure gauge>

1. Remove the union joint and bolt from special tool 

MD998709 (adapter hose) and instead attach special tool 
MD998742 (hose adapter) to the adapter hose.

2. Place a suitable O-ring or gasket on the assembled special 

tools MD998709 and MD998742 and install the fuel pres-
sure gauge.

3. Install the assembled fuel pressure measurement tools 

between the fuel rail and fuel high-pressure hose.

<When using special tool MB991637 (fuel pressure gauge 

set)>

1. Remove the union joint and bolt from special tool 

MD998709 (adapter hose) and instead attach special tool 
MD998742 (hose adapter) to the adapter hose.

2. Install special tool MB991637 (fuel pressure gauge set) into 

assembled special tools MD998709 and MD998742 via a 
gasket.

3. Install the assembled fuel pressure measurement tools 

between the fuel rail and fuel high-pressure hose.

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.
4. Connect scan tool MB991958 to the data link connector.
5. Use Actuator test 07 to drive the fuel pump. Check that there 

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

6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle.

Standard value: Approximately 324 kPa (95.7 in.Hg) at 
curb idle

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

after the engine has been revved several times.

AKX01457AH

FUEL PRESSURE 
GAUGE

O-RING OR GASKET

MD998709

MD998742

FUEL 
RAIL 

FUEL
HIGH-PRESSURE
HOSE

AKX01458

MB991637

O-RING OR GASKET

MD998709

MD998742

FUEL
RAIL

AI

FUEL
HIGH-PRESSURE
HOSE

AK303804AB

MB991910

DATA LINK
CONNECTOR

MB991824

MB991827

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1106

10.If any of fuel pressure measured in steps 8 to 9 is out of 

specification, troubleshoot and repair according to the table 
below.

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

is normal if the reading does not drop within two 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.

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

P.13A-1107

.)

WARNING

Cover the hose connection with shop towels to pre-
vent splash of fuel that could be caused by some 
residual pressure in the fuel pipe line.

13.Remove the fuel pressure gauge, and special tools 

MD998709, MD998742 and MB991637 from the fuel rail.

14.Replace the O-ring at the end of the fuel high-pressure hose 

with a new one.

15.Fit the fuel high-pressure hose into the fuel rail and tighten 

the bolts to specified torque.

Tightening torque: 5.0 

± 1.0 N⋅m (44 ± 8 in-lb)

16.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.

17.Disconnect scan tool MB991958.

SYMPTOM

PROBABLE CAUSE

REMEDY

• Fuel pressure too low

• Fuel pressure drops after racing

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

AKX01460AC

FUEL 
RAIL

FUEL HIGH-
PRESSURE
HOSE

MD998742

MD998709

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1107

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

M1131000900622

WARNING

When removing the fuel pipe, etc., release fuel pres-
sure to prevent fuel spray.

1. Remove the rear seat cushion assembly (Refer to GROUP 

52A, Rear Seat 

P.52A-30

).

2. Remove the hole cover (LH).

3. Disconnect the fuel pump module connector.
4. After starting the engine and letting it run until it stops 

naturally, turn the ignition switch to the "LOCK" (OFF) 
position.

5. Connect the fuel pump module connector.

6. Install the hole cover (LH).

Tightening torque: 1.5 

± 0.5 N⋅m (14 ± 4 in-lb)

7. Install the rear seat cushion assembly (Refer to GROUP 

52A, Rear Seat Assembly 

P.52A-30

).

AC306089AD

HOLE COVER

AC306490

FUEL PUMP MODULE
CONNECTOR

AB

AC306089

1.5 ± 0.5 N·m
14 ± 4 in-lb

AE

HOLE COVER

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>

13A-1108

FUEL PUMP OPERATION CHECK

M1131002000692

Required Special Tool:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB Cable

• MB991910: MUT-III Main Harness A

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. 
1. Check the operating of the fuel pump by using scan tool 

MB991958 to force-drive the fuel pump.

2. If the fuel pump will not operate, check by using the 

following procedure. If normal, check the fuel pump drive 
circuit.

(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove the rear seat cushion assembly (Refer to 

GROUP 52A, Rear Seat 

P.52A-30

).

(3) Remove the hole cover (LH).

(4) Disconnect the fuel pump module connector.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

AC306089AD

HOLE COVER

AC306490

FUEL PUMP MODULE
CONNECTOR

AB