Mitsubishi Montero (2004+). Manual — part 147

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-75

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.00-6

.

NO : Replace the PCM. Then go to Step 18.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 6. Check connector B-28 at the manifold absolute
pressure sensor and connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between manifold absolute

pressure sensor connector B-28 (terminal No. 1) and
PCM connector D-135 (terminal No. 101) 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 B-28 by backprobing.
(1) Do not disconnect the connector B-28.
(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.

AK200975

1

2

3

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-28

B-28(B)

AK200947

91

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94

95

96

97

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101

102

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108

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110

111

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119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

AK200975

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2

3

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-28

B-28(B)

3

2

1

AK203036

B-28 HARNESS
CONNECTOR:
HARNESS SIDE

AI

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 D-135 by backprobing.
(1) Do not disconnect the connector D-135.
(2) Turn the ignition switch to the "ON" position.

(3) Measure the voltage between terminal No. 97 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.

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120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

AK302427

9192

939495

96979899

100

105

113

115116

118119120

107108

110111112

101102103

104

109

117

D-135 HARNESS
CONNECTOR:
HARNESS SIDE

AB

109

117

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

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MULTIPORT FUEL INJECTION (MFI)

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STEP 9. Check connector B-28 at the manifold absolute
pressure sensor and connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Repair harness wire between manifold absolute

pressure sensor connector B-28 (terminal No. 3) and
PCM connector D-135 (terminal No. 97) 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.

AK200975

1

2

3

AB

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-28

B-28(B)

AK200947

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95

96

97

98

99

100

101

102

103

104

105

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107

108

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110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)