Mitsubishi Galant (2004+). Manual - part 1273

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-785

DTC SET CONDITIONS

Logic Flow Chart

.

INDICATED FUEL LEVEL

CHANGE < 2L

ACCUMULATE FUEL CONSUMPTION

THROUGH FUEL INJECTORS.

ACCUMULATED FUEL 
CONSUMPTION WILL NOT 
RESET WHEN KEY-OFF/ON.

ACCUMULATED FUEL 

CONSUMPTION > =30L

START

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

MONITORING

CONDITIONS

RESET ACCUMULATE

FUEL CONSUMPTION.

AK302407

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-786

Check Conditions, Judgement Criteria

• When the fuel consumption calculated from the 

operation time of the injector amounts to 30 liters 
(7.9 gal), the diversity of the amount of fuel in 
tank calculated from the fuel level sensor is 2 
liters (0.5 gal) or less.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function 

− OBD-II Drive Cycle − 

Procedure 6 

− Other Monitor 

P.13B-5

.

.

TROUBLESHOOTING HINTS (The most likely 
causes for this code to be set are:)

• Fuel pump module or fuel level sensor  failed.

• Open or shorted fuel level sensor circuit, or con-

nector damage.

• PCM failed.

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) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.

(3) Read the DTC.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is DTC P2066 set?

YES : Go to Step 2.
NO :  Go to Step 4.

STEP 2. Check fuel gauge.
Q: Is the fuel gauge functioning?

YES : Go to Step 3.
NO :  Refer to GROUP 54A, Chasiss Electrical 

− 

Combination Meters Assembly and Vehicle Speed 
Sensor 

− Symptom Chart 

P.54A-77

.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-787

STEP 3. Check the trouble symptoms.

(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13B-5

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0461 set?

YES : Replace the PCM. Then go to Step 10.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

STEP 4. Check harness connector B-20 at PCM and D-18 at 
fuel level sensor (main) for damage. 

Q: Are the connectors in good condition?

YES : Go to Step 5.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 10.

AK303092

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

CONNECTOR: B-20

B-20

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-788

STEP 5. Check for open circuit and short circuit to ground 
between PCM connector B-20 (terminal No. 24) and fuel 
level sensor (main) connector D-18 (terminal No. 2).

NOTE: Check harness after checking intermediate connector 
C-25. If intermediate connector is damaged, repair or replace it. 
Refer to GROUP 00E, Harness Connector Inspection 

P.00E-2

. 

Then go to Step 9.
Q: Is the harness wire in good condition?

YES : Go to Step 6.
NO :  Repair it. Then go to Step 10.

AK303092

25

21

24 23 22

29 28 27 26

34 33 32 31 30

38 37 36 35

43 42 41 40 39

CONNECTOR: B-20

B-20

PCM

AB

HARNESS CONNECTOR: 
COMPONENT SIDE

AIR CLEANER

1

2

3

4

5

AK303159

SERVICE
HOLE

AB

FUEL PUMP MODULE
(INCORPORATING FUEL
LEVEL SENSOR (MAIN)
AND FUEL TANK
TEMPERATURE SENSOR)

CONNECTOR: D-18

D-18 (GR)

HARNESS
CONNECTOR:
COMPONENT SIDE