Mitsubishi Montero (2004+). Manual — part 231

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-411

STEP 4. Check for short circuit to ground between fuel
tank temperature sensor connector G-03 and PCM
connector D-134.

NOTE: Check harness after checking intermediate connector
D-111, E-113 and F-07. If the intermediate connectors are dam-
aged, repair or replace it. Refer to GROUP 00E, Harness Con-
nector Inspection

P.00E-2

. Then go to Step 5.

Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 5.
NO : Repair it. Then go to Step 5.

STEP 5. 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.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0182 set?

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

AK200959

1

2

3

AB

CONNECTOR: G-03

G-03(B)

HARNESS
CONNECTOR:
COMPONENT SIDE

AK201166

61

62

63

64

65

66

67

68

69

70

71

76

77

78

79

85

86

87

80

72

73

74

75

81

82

83

84

88

89

CONNECTOR: D-134

AB

PCM

D-134(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-412

DTC P0183: Fuel Tank Temperature Sensor Circuit High Input

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-413

.

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 sensor output voltage is out of

specified range.

.

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

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MULTIPORT FUEL INJECTION (MFI)

13A-414

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 4.6

volts or higher for 2 seconds.

.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-4

.

.

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

• Fuel tank temperature sensor failed.

• Open fuel tank temperature 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

• MB991911: Main Harness B

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

AK302940