Mitsubishi Galant 9G. Manual — part 1133

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-832

STEP 6. Check the fuel pump module.
Check to see if the fuel pump module is normal. Refer to
GROUP 54A, Chassis Electrical

− Combination Meters Assem-

bly and Vehicle Speed Sensor

− On-Vehicle Service − Fuel

Level Sensor Check

P.54A-104

.

Q: Is the fuel pump module normal?

YES : Go to Step 7.
NO : Replace the fuel pump module. Then go to Step 8.

STEP 7. 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-6

.

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

YES : Replace the PCM. Then go to Step 8.
NO : It can be assumed that this malfunction is intermittent.

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

− How to

Cope with Intermittent Malfunctions

P.00-14

.

STEP 8. Test the OBD-II drive cycle.
(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-6

.

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

YES : Retry the troubleshooting.
NO : The inspection is complete.

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-833

DTC P0462: Fuel Level Sensor Circuit Low Input

1

2 3

4

5

22

21

23 24 25

26 27 28 29

30 31 32 33 34

35 36 37 38

39 40 41 42 43

1

2

AK401489

Fuel Level Sensor Circuit

FUEL LEVEL
SENSOR (SUB)

FUEL LEVEL SENSOR (MAIN)
(INTEGRATED IN FUEL PUMP MODULE)

13

2

1

2

1

11

PINK-

BLA

CK

BLA

CK

PINK-
BLACK

PINK-

BLA

CK

PINK-BLA

CK

24

GRA

Y

GRA

Y

POWERTRAIN
CONTROL
MODULE (PCM)

C-28

C-25

D-18

(MU802058)

D-17

CONBINATION METER

B-20

13

31

G

G

32 33 34 35 36 37 38 39 40 41

42 43 44 45 46 47 48 49 50 51 52

C-101

AK303875AB

CONNECTOR: D-17

FUEL LEVEL
SENSOR (SUB)

D-17

SERVICE
HOLE

AK303876AB

CONNECTOR: D-18

SERVICE
HOLE

FUEL LEVEL SENSOR (MAIN)
(INTEGRATED IN FUEL PUMP MODULE)

D-18 (GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-834

.

CIRCUIT OPERATION

• The fuel level sensor output voltage is input in

combination meter (terminal No. 13).

.

TECHNICAL DESCRIPTION

• The fuel level sensor converts the rest of the fuel

to a voltage.

• The combination meter sends the data regarding

the rest of the fuel to the PCM.

• The PCM checks whether this data is within a

specified range.

.

DESCRIPTIONS OF MONITOR METHODS

A short circuit is detected while monitoring the fuel

level sensor output.

.

MONITOR EXECUTION

Continuous

.

MONITOR EXECUTION CONDITIONS
(Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

.

AK303838AB

C-25

CONNECTOR: C-25

AK303877AB

C-28

CONNECTOR: C-28

AK303085

CONNECTOR: B-20

PCM

AB

AIR CLEANER

B-20

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-835

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• Battery positive voltage is between 11 and 16.5

volts.

• 2 seconds or more have passed since the engine

staring sequence was completed.

Judgement Criterion

• Fuel level sensor output voltage has continued to

be lower than 0.3 volt for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN

Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13B-6

.

.

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

• Fuel level sensor failed.

• Shorted fuel level sensor circuit or connector

damage.

• PCM failed.

END

MALFUNCTION

YES

YES

YES

NO

NO

NO

CONTINUOUS

FAILURE FOR 2secs

OUTPUT VOLTAGE

< 0.3V

OUTPUT VOLTAGE

> 4.6V

MONITORING

CONDITIONS

GOOD

START

AK401534

YES

NO