Mitsubishi Galant 9G. Manual - part 1041

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-464

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the engine 

starting sequence was completed.

Judgement Criteria

• Sensor output voltage has continued to be 0.1 

volt or lower 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 tank temperature sensor failed.

• Shorted fuel tank temperature sensor circuit or 

connector damage.

• PCM failed.

START

MONITORING

CONDITIONS

END

NO

NO

NO

YES

YES

YES

MALFUNCTION

GOOD

OUTPUT VOLTAGE

< 0.1V

CONTINUOUS

FAILURE FOR 2secs

OUTPUT VOLTAGE

> 4.6V

NO

YES

AK302403

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-465

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, check data list item 
4A: Fuel Tank Temperature Sensor.

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) Set scan tool MB991958 to the data reading mode for item 

4A, Fuel Tank Temperature Sensor.

• Approximately the same as the ambient air temperature 

when the engine is cooled.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?

YES : 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

.

NO :  Go to Step 2.

AC305412

AB

MB991910

DATA LINK

CONNECTOR

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-466

STEP 2. Check the fuel tank temperature sensor.
(1) Disconnect the fuel tank temperature sensor connector 

D-18.

(2) Measure the resistance between terminal No. 1 and No. 3 

of the fuel tank temperature sensor.

Standard value:

0.5 

− 12.0 kΩ

Q: Is the measured resistance between 0.5 and 12.0 k

Ω?

YES : Go to Step 3.
NO :  Replace the fuel tank temperature sensor. Then go to 

Step 5.

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS 
CONNECTOR: 
COMPONENT SIDE

1

2 3

4

5

AK203165

FUEL TANK TEMPERATURE
SENSOR CONNECTOR

AB

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI) <3.8L ENGINE>

13B-467

STEP 3. Check harness connector D-18 at the fuel tank 
temperature sensor and harness connector B-20 at PCM 
for damage.
Q: Is the harness connector in good condition?

YES : Go to Step 4.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 5.

AK303840

1

2

3

4

5

SERVICE
HOLE

AB

CONNECTOR: D-18

D-18 (GR)

HARNESS 
CONNECTOR: 
COMPONENT SIDE

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