Mitsubishi Montero (2004+). Manual — part 146
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-71
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
NO : Go to Step 2.
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-72
STEP 2. Measure the sensor output 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. 1 and ground by
backprobing.
• When altitude is 0 m (0 foot), voltage should be 3.7 and
4.3 volts.
• When altitude is 600 m (1,969 feet), voltage should be
3.4 and 4.0 volts.
• When altitude is 1,200 m (3,937 feet), voltage should be
3.2 and 3.8 volts.
• When altitude is 1,800 m (5,906 feet), voltage should be
2.9 and 3.5 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.
AK200975
1
2
3
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-28
B-28(B)
3
2
1
AK203034
B-28 HARNESS
CONNECTOR:
HARNESS SIDE
AI
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-73
STEP 3. Measure the sensor output 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. 101 and ground.
• When altitude is 0 m (0 foot), voltage should be 3.7 and
4.3 volts.
• When altitude is 600 m (1,969 feet), voltage should be
3.4 and 4.0 volts.
• When altitude is 1,200 m (3,937 feet), voltage should be
3.2 and 3.8 volts.
• When altitude is 1,800 m (5,906 feet), voltage should be
2.9 and 3.5 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.
AK200947
91
92
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95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
AK302424
9192
939495
96979899
100
105
113
115116
118119120
107108
110111112
101102103
104
106
114
D-135 HARNESS
CONNECTOR:
HARNESS SIDE
AB
106
114
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
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MULTIPORT FUEL INJECTION (MFI)
13A-74
STEP 4. 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 : Go to Step 5.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. 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
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100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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