Mitsubishi Montero Sport (2004+). Manual - part 163

 

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Mitsubishi Montero Sport (2004+). Manual - part 163

 

 

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-65

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 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 :  Go to Step 2.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-66

STEP 2. Measure the sensor output 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. 1 and ground by 

backprobing.

• When altitude is 0 m (0 foot), voltage should be 3.8and 

4.2 volts.

• When altitude is 600 m (1,969 feet), voltage should be 

3.5 and 3.9 volts.

• When altitude is 1,200 m (3,937 feet), voltage should be 

3.3 and 3.7 volts.

• When altitude is 1,800 m (5,906 feet), voltage should be 

3.0 and 3.4 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 3.
NO :  Go to Step 7.

AK200034

2 1

3

AB

CONNECTOR: A-12

A-12(B)

HARNESS 
CONNECTOR:
COMPONENT 
SIDE

3

2

1

AK203034

A-12 HARNESS 
CONNECTOR: 
HARNESS SIDE

AF

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-67

STEP 3. Measure the sensor output voltage at PCM 
connector C-91 by backprobing.
(1) Do not disconnect the connector C-91.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 91 and ground.

• When altitude is 0 m (0 foot), voltage should be 3.8 and 

4.2 volts.

• When altitude is 600 m (1,969 feet), voltage should be 

3.5 and 3.9 volts.

• When altitude is 1,200 m (3,937 feet), voltage should be 

3.3 and 3.7 volts.

• When altitude is 1,800 m (5,906 feet), voltage should be 

3.0 and 3.4 volts.

(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the voltage normal?

YES : Go to Step 4.
NO :  Go to Step 6.

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

AK300867

7172 73 74

75 76 77

78 79 80 81 82 83 84 85 86 87 88 89
90 91

92 93 94

95 96

97 98

C-91 HARNESS 
CONNECTOR: 
HARNESS SIDE

AE

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-68

STEP 4. 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 : Go to Step 5.
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

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

 

 

 

 

 

 

 

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