Mitsubishi Montero Sport (2004+). Manual — part 164

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

13A-69

STEP 5. Using scan tool MB991958, check data list item 95:
Manifold Absolute Pressure 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

95, Manifold Absolute Pressure Sensor.

• When altitude is 0 m (0 foot), 101 kPa (29.8 in.Hg).

• When altitude is 600 m (1,969 feet), 95 kPa (28.1 in.Hg).

• When altitude is 1,200 m (3,937 feet), 88 kPa (26.0

in.Hg).

• When altitude is 1,800 m (5,906 feet), 81 kPa (23.9

in.Hg).

(4) Start the engine.

• When the engine is idling, 16 − 36 kPa (4.7 − 10.6

in.Hg).

• When the engine is suddenly revved, manifold absolute

pressure increases.

(5) 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 : Replace the PCM. Then go to Step 18.

AK303629AB

MB991911

MB991827

MB991824

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 6. Check connector A-12 at the manifold absolute
pressure sensor and connector C-91 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between manifold absolute

pressure sensor connector A-12 (terminal No. 1) and
PCM connector C-91 (terminal No. 91) because of
open circuit or harness damage. Then go to Step 18.

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

Connector Inspection

P.00E-2

. Then go to Step 18.

STEP 7. Measure the sensor supply voltage at manifold
absolute pressure sensor connector A-12 by backprobing.
(1) Do not disconnect the connector A-12.
(2) Turn the ignition switch to the "ON" position.

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

backprobing.

• Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 12.
NO : Go to Step 8.

AK200034

2 1

3

AB

CONNECTOR: A-12

A-12(B)

HARNESS
CONNECTOR:
COMPONENT
SIDE

AK104028

98

78

71

88

89

76

77

72
79
91

73
80

74

75

81
92

82

83

93

84

85

94

86

87

95

96

90

97

AB

CONNECTOR: C-91

C-91(GR)

HARNESS CONNECTOR:
COMPONENT SIDE

AK200034

2 1

3

AB

CONNECTOR: A-12

A-12(B)

HARNESS
CONNECTOR:
COMPONENT
SIDE

3

2

1

AK203036

A-12 HARNESS
CONNECTOR:
HARNESS SIDE

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 8. Measure the sensor supply voltage at PCM
connector C-90 by backprobing.
(1) Do not disconnect the connector C-90.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 46 and ground.

• Voltage should be between 4.8 and 5.2 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage between 4.8 and 5.2 volts?

YES : Go to Step 9.
NO : Go to Step 10.

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

AK000284 AM

<A/T>

C-90 HARNESS
CONNECTOR:
HARNESS SIDE

41 42 43

44 45 46

47 48 49 50 51 52 53 54 55 56 57
58 59

60 61 62 63

64 65 66

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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STEP 9. Check connector A-12 at the manifold absolute
pressure sensor and connector C-90 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between manifold absolute

pressure sensor connector A-12 (terminal No. 3) and
PCM connector C-90 (terminal No. 46) because of
open circuit or harness damage. Then go to Step 18.

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

Connector Inspection

P.00E-2

. Then go to Step 18.

AK200034

2 1

3

AB

CONNECTOR: A-12

A-12(B)

HARNESS
CONNECTOR:
COMPONENT
SIDE

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