Mitsubishi Montero (2004+). Manual - part 332

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-815

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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1

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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

AK200947

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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

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-816

STEP 9. 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. 1) 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 

P.00E-2

. Then go to Step 18.

AK200937

3

4

5

1

2

6

7

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK200947

91

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97

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104

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120

CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-817

STEP 10. 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 11.
NO :  Repair or replace it. Refer to GROUP 00E, Harness 

Connector Inspection 

P.00E-2

. Then go to Step 18.

AK200937

3

4

5

1

2

6

7

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK200947

91

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93

94

95

96

97

98

99

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102

103

104

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120

CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-818

STEP 11. Check for short circuit to ground between 
barometric pressure sensor connector B-48 (terminal No. 
1) and PCM connector D-135 (terminal No. 97).
Q: Is the harness wire in good condition?

YES : Replace the PCM. Then go to Step 18.
NO :  Repair it. Then go to Step 18.

AK200937

3

4

5

1

2

6

7

AB

HARNESS 
CONNECTOR: 
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK200947

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97

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104

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119

120

CONNECTOR: D-135

HARNESS CONNECTOR: 
COMPONENT SIDE

AB

PCM

D-135(GR)