Mitsubishi Montero (2002-2004). Manual - part 582

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-25

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

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-26

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 

P.00E-2

. Then go to Step 18.

AK200937

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5

1

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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)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-27

STEP 5. 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 

P.00-6

.

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 

P.00E-2

. Then go to Step 18.

ACX01539

16-PIN

MB991502

AC

AK200937

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1

2

6

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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)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-28

STEP 7. 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 12.
NO :  Go to Step 8.

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 

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 9.
NO :  Go to Step 10.

AK200937

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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

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CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

9192

939495

96979899

100101102103

104

105106

107108109

110111112

113114

115116117

118119120

AK201393

D-135 HARNESS 
CONNECTOR: 
HARNESS SIDE

AB