Mitsubishi Montero (2004+). Manual - part 227

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-395

STEP 8. Check the fuel pressure.

Refer to On-vehicle Service 

− Fuel Pressure Test 

P.13A-995

.

Q: Are there any abnormalities?

YES : Repair it. Then go to Step 10.
NO :  Go to Step 9.

STEP 9. Replace the left bank injector.

(1) Replace the left bank injector.
(2) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 2 − 

Fuel Trim Monitor 

P.13A-4

.

(3) Read in the diagnostic trouble code (DTC).
Q: Is DTC P0175 set?

YES : Replace the PCM. Then go to Step 10.
NO :  The inspection is complete.

STEP 10. 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 2 − 

Fuel Trim Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0175 output?

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

AK201292

1

2

B-11(GR)

B-35(GR)

B-33(GR)

CONNECTORS: B-11, B-33, B-35

AB

HARNESS 
CONNECTORS: 
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-396

DTC P0181: Fuel Tank Temperature Sensor Circuit Range/Performance

POWERTRAIN CONTROL
MODULE (PCM)

Fuel Tank Temperature  Sensor  Circuit

2

16

3

2

7

1

BLA

C

K

BLA

C

K

LIGHT 

GREEN-

RED

G-03

MU802337

1 2 3

AK201139

81

FUEL TANK TEMPERATURE SENSOR
(INTEGRATED IN FUEL LEVEL SENSOR)

4

17

1

12 13 14

18

30

41

34

3

16

10

6 7

19

31

42

20

32

43

21

33

25

24

26

36

35

37

29

28

15

27

38

8 9

39 40

11

2

22

5

23

D-111

8

7

6

5

1 2 3 4

F-07

MU802609

11

1

9 10

13

2

12

3 4

7

5

14

6

8

E-113

5 V

LIGHT 

GREEN-

RED

LIGHT 

GREEN-

RED

LIGHT GREEN-

RED

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-397

.

CIRCUIT OPERATION

• 5-volt voltage is applied to the fuel tank tempera-

ture sensor output terminal (terminal No. 3) from 
the PCM (terminal No. 81) via the resistor in the 
PCM.

• The fuel tank temperature sensor output voltage 

increases when the resistance increases and 
decreases when the resistance decreases. The 
ground terminal (terminal No. 2) is grounded to 
the vehicle body.

.

TECHNICAL DESCRIPTION

• The fuel tank temperature sensor converts the 

fuel tank temperature to a voltage.

• The PCM detects the fuel tank temperature in the 

fuel tank with this output voltage.

.

DESCRIPTIONS OF MONITOR METHODS
Fuel tank temperature at engine start is higher than 

engine coolant temperature at engine start by 
specified value when engine is cold start condi-
tion.

.

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)

• Engine coolant temperature sensor

• Intake air temperature sensor

.

AK201038

CONNECTOR: D-134

AD

PCM

D-134(GR)

AK201053

E-113

AB

CONNECTOR: E-113

AK201055

CONNECTOR: D-111

D-111

AB

AK201040 AB

CONNECTOR: G-03

G-03(B)

FUEL TANK TEMPERATURE SENSOR
(INTEGRATED IN FUEL 
LEVEL SENSOR)

AK304350

F-07 (B)

AB

CONNECTOR: F-07

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-398

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• The engine coolant temperature − intake air tem-

perature is 5

°C (9°F) or less when the engine is 

started.

• The engine coolant temperature is between 

−10°C (14°F) and 36°C (96.8°F) when the engine 

is started.

• The engine coolant temperature is higher than 

60

°C (140°F).

• Maximum vehicle speed is higher than 30 km/h 

(19 mph) after the starting sequence has been 
completed.

Judgement Criteria

• The fuel tank temperature − engine coolant tem-

perature is 15

°C (27°F) or more when the engine 

is started.

.

START

NO

YES

YES

YES

YES

NO

NO

NO

END

NO

YES

YES

NO

MALFUNCTION

GOOD

MONITORING

CONDITIONS

“FUEL TEMP. AT 

ENGINE START” -

“ENGINE COOLANT TEMP. AT 

ENGINE START”

> 15˚C (27˚F)

ENGINE COOLANT TEMP.

> =60˚C (140˚F)

ENGINE COOLANT TEMP.

> =60˚C (140˚F)

MAX.VEHICLE SPEED

> 30km/h (9mph)

MAX.VEHICLE SPEED

> 30km/h (9mph)

AK302939