Mitsubishi Montero (2002-2004). Manual — part 585
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-37
DIAGNOSIS
Required Special Tool:
• MB991502: Scan Tool (MUT-II)
STEP 1. Using scan tool MB991502, check data list item 25:
Barometric Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 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 : Go to Step 2.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-38
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 5.
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4
5
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
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-39
STEP 3. 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 : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
STEP 4. Using scan tool MB991502, check data list item 25:
Barometric Pressure Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 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 12.
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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114
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117
118
119
120
CONNECTOR: D-135
HARNESS CONNECTOR:
COMPONENT SIDE
AB
PCM
D-135(GR)
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-40
STEP 5. Measure the sensor supply 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. 1 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 7.
NO : Go to Step 6.
STEP 6. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?
YES : Replace the PCM. Then go to Step 12.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 12.
AK200937
3
4
5
1
2
6
7
AB
HARNESS
CONNECTOR:
COMPONENT SIDE
CONNECTOR: B-48
B-48(B)
AKX01521
6 7
1 2 3 4 5
AKX01521 AJ
B-48 HARNESS
CONNECTOR:
HARNESS SIDE
AK200947
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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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