Mitsubishi Montero Sport (2004+). Manual — part 252

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-421

DTC SET CONDITIONS

Logic Flow Chart

.

Check Conditions

• 2 seconds or more have passed since the start-

ing 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, har-

ness damage or connector damage.

• PCM failed.

NOTE: A diagnostic trouble code (DTC) could be
output if the engine coolant is changed as indicated
below. Because this is not a failure, the DTC must be
erased.
Make sure to test drive the vehicle in accordance
with the drive cycle pattern in order to verify that a
DTC will not be output.

.

•

The engine and the radiator have been flushed
repeatedly when the engine coolant temperature
was high (or the fuel tank temperature was high).

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

AK301445

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-422

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I

• MB991827: USB Cable

• MB991911: Main Harness B

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.

• With the engine cool, the fuel tank temperature should

be approximately the same as ambient air temperature.

(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

P.00-7

.

NO : Go to Step 2.

STEP 2. Check connector E-30 at the fuel tank temperature
sensor for damage.
Q: Is the connector in good condition?

YES : Go to Step 3.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-423

STEP 3. Check the fuel tank temperature sensor.
(1) Disconnect the fuel tank temperature sensor connector

E-30.

(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 resistance between 0.5 and 12.0 k

Ω?

YES : Go to Step 4.
NO : Replace the fuel tank temperature sensor. Then go to

Step 11.

STEP 4. Measure the sensor supply voltage at fuel tank
temperature sensor harness side connector E-30.
(1) Disconnect the connector E-30 and measure at the harness

side.

(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 1 and ground.

• Voltage should be between 4.5 and 4.9 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 8.
NO : Go to Step 5.

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30

AK000576

3

1 2

FUEL TANK TEMPERATURE
SENSOR CONNECTOR

AC

AK200019

3 2 1

CONNECTOR: E-30

AB

HARNESS
CONNECTOR:
COMPONENT
SIDE

E-30

3 2

AK000574

1

E-30 HARNESS
CONNECTOR:
COMPONENT SIDE

AD

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-424

STEP 5. Measure the sensor supply voltage at PCM
connector C-90 by backprobing.
(1) Do not disconnect the PCM connector C-90.
(2) Disconnect the fuel tank temperature sensor connector

E-30.

(3) Turn the ignition switch to the "ON" position.

(4) Measure the voltage between terminal No. 51 and ground

by backprobing.

• Voltage should be between 4.5 and 4.9 volts.

(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.5 and 4.9 volts?

YES : Go to Step 6.
NO : Go to Step 7.

STEP 6. Check connector C-90 at PCM for damage.
Q: Is the connector in good condition?

YES : Check connector C-85 and E-44 at intermediate

connector for damage, and repair or replace as
required. Refer to GROUP 00E, Harness Connector
Inspection

P.00E-2

. If intermediate connectors are in

good condition, repair harness wire between fuel tank
temperature sensor connector E-30 (terminal No.1)
and PCM connector C-90 (terminal No.51) because of
open circuit. Then go to Step 11.

NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 11.

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

54 55 56

46

45

44

58 59

60 61 62 63

64 65 66

47

41 42 43

48 49 50

57

51 52

AK101075

53

C-90 HARNESS
CONNECTOR:
HARNESS SIDE

AQ

AK103762

42

43

48

49

50

51

52

53

54

55

56

57

46 45 44

58

59

60

61

62

63

64

65

66

47

41

AB

CONNECTOR: C-90

C-90(GR)

HARNESS CONNECTOR:
COMPONENT SIDE