Mitsubishi Galant (2004+). Manual - part 1664

FUEL SUPPLY DIAGNOSIS

TSB Revision

FUEL SUPPLY

13C-3

SYMPTOM PROCEDURES

INSPECTION PROCEDURE 1 : Engine Malfunctions Due to Insufficient Fuel Supply

TROUBLESHOOTING HINTS (The most likely 
causes for this case: )

• Injector failed.

• Open or shorted injector circuit, or loose connector.

• Bent, twisted or clogged fuel pipe or hose.

• Malfunction of the fuel pump module.

DIAGNOSIS

Required Special Tools:

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

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991910: Main Harness A

STEP 1. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) Ensure that the ignition switch is at the "LOCK" (OFF) 

position.

(2) Start up the personal computer.
(3) Connect special tool MB991827 to special tool MB991824 

and the personal computer.

(4) Connect special tool MB991910 to special tool MB991824.
(5) Connect special tool MB991910 to the data link connector.
(6) Turn the power switch of special tool MB991824 to the "ON" 

position.
NOTE: When special tool MB991824 is energized, special 
tool MB991824 indicator light will be illuminated in a green 
color.

(7) Start the MUT-III system on the personal computer.
(8) Turn the ignition switch to the "ON" position.
(9) Select "Interactive Diagnosis" from the start-up screen.
(10)Select "System select."
(11)Choose "MFI" from the "POWER TRAIN" tab.
(12)Select "MITSUBISHI."
(13)Select "Diagnostic Trouble Code."
(14)If a DTC is set, it is shown.
Q: Is the DTC set?

YES : Refer to Diagnostic Trouble Code Chart. <2.4L 

Engine>

P.13A-34

 , <3.8L Engine>

P.13B-33

 .

NO :  Turn the ignition switch to the "LOCK" (OFF) position, 

and then remove scan tool MB991958 in the reverse 
order of installation. Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

FUEL SUPPLY DIAGNOSIS

TSB Revision

FUEL SUPPLY

13C-4

STEP 2. Check the fuel pressure.

Release residual pressure from the fuel line to prevent fuel 
spray. Refer to Fuel Pressure Test. <2.4L Engine>

P.13A-1104

 

,<3.8L Engine>

P.13B-1133

 .

Q: Is the fuel pressure in good condition?

YES : Go to Step 5.
NO :  Repair or replace. Then go to Step 3.

STEP 3. Check for bending, twisting or clogging of the fuel 
pipe or hose.

Q: Are the fuel pipe and hose in good condition?

YES : Go to Step 4.
NO :  Repair or replace. Then go to Step 6.

STEP 4. Check the fuel pump module operation.
Refer to Fuel Pump Operation Check. <2.4L 
Engine>

P.13A-1108

 ,<3.8L Engine>

P.13B-1136

 .

Q: Is the fuel pump module operation in good condition?

YES : Then go to Step 5.
NO :  Replace (Refer to 

P.13C-10

). Then go to Step 6.

STEP 5. Check the inside of the fuel tank for contamination 
and rust.
(1) Drain fuel.

(2) Remove the fuel tank (Refer to 

P.13C-10

).

Q: Is the fuel tank in good condition?

YES : Go to Step 6.
NO :  Replace the fuel filter, and clean the fuel tank and fuel 

line. Then go to Step 6.

STEP 6. Retest the system.
Q: Is the engine malfunction eliminated?

YES : The procedure is complete.
NO :  Return to Step 1.

AC307454 AB

FUEL PIPE

FUEL
HOSE

SPECIAL TOOLS

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FUEL SUPPLY

13C-5

SPECIAL TOOLS

M1135000600300

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION APPLICATION

MB991958

A: MB991824
B: MB991827
C: MB991910
D: MB991911
E: MB991914
F: MB991825
G: MB991826

MUT-III sub assembly

A: Vehicle 

communication 
interface (V.C.I.)

B: MUT-III USB cable
C: MUT-III main harness 

A (Vehicles with CAN 
communication 
system)

D: MUT-III main harness 

B (Vehicles without 
CAN communication 
system)

E: MUT-III main harness 

C (for Daimler Chrysler 
models only)

F: MUT-III measurement 

adapter

G: MUT-III trigger 

harness

MB991824-KIT
NOTE: G: 
MB991826 MUT-III 
Trigger Harness is 
not necessary 
when pushing 
V.C.I. ENTER key.

Checking diagnostic trouble 
codes

CAUTION

For vehicles with CAN 
communication, use MUT-III 
main harness A to send 
simulated vehicle speed. If 
you connect MUT-III main 
harness B instead, the CAN 
communication does not 
function correctly.

MB991658
Test harness set

Tool not available

Fuel tank differential pressure 
sensor check

MB991910

MB991826

MB991958

MB991911

MB991914

MB991824

MB991827

MB991825

DO NOT USE

A

B

C

D

E

F

G

DO NOT USE

MB991658

ON-VEHICLE SERVICE

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FUEL SUPPLY

13C-6

ON-VEHICLE SERVICE

FUEL LEVEL SENSOR CHECK

M1135005300069

Refer to GROUP 54A - Combination Meter, On-vehicle Service, 
Fuel Level Sensor Check 

P.54A-108

.

FUEL LEVEL SENSOR REPLACEMENT

M1135005600026

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

52A, Rear Seat Assembly 

P.52A-30

.)

2. Remove the hole cover (RH).

3. Disconnect the fuel level sensor (sub) connector and fuel 

tank differential pressure sensor connector.

CAUTION

When withdrawing the fuel level sensor (sub) from the fuel 
tank, be careful not damage the sensor unit and the float.
4. Remove the fuel level sensor (sub) mounting bolts and 

remove the fuel tank gauge unit from service hole.

CAUTION

When inserting the fuel level sensor (sub) into the fuel 
tank, be careful not damage the sensor unit and the float.
5. Install the fuel level sensor to the fuel tank through the 

service hole.

AC306089

HOLE COVER

AB

 AC306093

FUEL LEVEL SENSOR 
(SUB) CONNECTOR

FUEL TANK DIFFERENTIAL
PRESSURE SENSOR

AB

AC307206AB

FLOAT

FUEL LEVEL 
SENSOR (SUB)

AC307206AB

FLOAT

FUEL LEVEL 
SENSOR (SUB)