Mitsubishi Montero (2004+). Manual — part 143
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-59
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
NO : Replace the PCM. Then go to Step 18.
AK302970
AB
MB991911
MB991824
MB991827
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-60
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
. 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
92
93
94
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)
AK200975
1
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
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-61
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.
AK200947
91
92
93
94
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)
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
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-62
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
. Then go to Step 18.
AK200975
1
2
3
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-28
B-28(B)
AK200947
91
92
93
94
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)
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