Mitsubishi Montero (2004+). Manual — part 331
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-811
STEP 2. Measure the sensor output voltage at barometric
pressure sensor connector B-48 by backprobing.
(1) Do not disconnect the connector B-48.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 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.
AK200937
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1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AKX01520
6 7
1 2 3 4 5
AKX01520AK
B-48 HARNESS
CONNECTOR:
HARNESS SIDE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-812
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. 100 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 4.
NO : Go to Step 6.
AK200947
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CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
AK201391
9192
939495
96979899
100101102103
104
105106
107108109
110111112
113114
115116117
118119120
D-135 HARNESS
CONNECTOR:
HARNESS SIDE
AB
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-813
STEP 4. Check connector B-48 (terminal No. 2) at the
barometric pressure sensor and connector D-135 (terminal
No. 100) 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.
AK200937
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4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
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CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-814
STEP 5. Using scan tool MB991958, check data list item 25:
Barometric 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
25, Barometric 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) 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.
STEP 6. Check connector B-48 at the barometric pressure
sensor and connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Repair harness wire between barometric pressure
sensor connector B-48 (terminal No. 2) and PCM
connector D-135 (terminal No. 100) 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.
AK302970
AB
MB991911
MB991824
MB991827
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
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100
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116
117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
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