Mitsubishi Montero (2004+). Manual - part 328

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-799

STEP 14. Check for harness damage between accelerator 
pedal position sensor connector D-138 (terminal No. 3) and 
PCM connector D-135 (terminal No. 114).
Q: Is the harness wire in good condition?

YES : Go to Step 15.
NO :  Repair it. Then go to Step 17.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS 
CONNECTOR: 
COMPONENT SIDE

D-138(GR)

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)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-800

STEP 15. Check for harness damage between accelerator 
pedal position sensor connector D-138 (terminal No. 6) and 
PCM connector D-135 (terminal No. 107).
Q: Is the harness wire in good condition?

YES : Go to Step 16.
NO :  Repair it. Then go to Step 17.

STEP 16. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).

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) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2138 set?

YES : Replace the PCM. Then go to Step 17.
NO :  It can be assumed that this malfunction is intermittent. 

Refer to GROUP 00, How to Use 
Troubleshooting/Inspection Service Points 

P.00-6

.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS 
CONNECTOR: 
COMPONENT SIDE

D-138(GR)

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)

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-801

STEP 17. Using scan tool MB991958, read the diagnostic 
trouble code (DTC).
(1) Connect scan tool MB991958 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2138 set?

YES : Retry the troubleshooting.
NO :  The inspection is complete.

AK302970

AB

MB991911

MB991824

MB991827

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-802

DTC P2227: Barometric Pressure Circuit Range/Performance Problem

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the barometric 

pressure sensor power terminal (terminal No. 1) 
from the PCM (terminal No. 97). The ground ter-
minal (terminal No. 5) is grounded with PCM (ter-
minal No. 88).

• A voltage that is proportional to the atmospheric 

pressure is sent to the PCM (terminal No. 100) 
from the barometric pressure sensor output ter-
minal (terminal No. 2).

.

AK201127

GREEN-YELLO

W

GREEN-WHITE

SKY B

U

LE

BAROMETRIC PRESSURE SENSOR
(INCORPORATED IN VOLUME AIRFLOW 
 SENSOR)

1

97

5 V

100

88

2

5

POWERTRAIN CONTROL MODULE (PCM)

1 2 3 4 5 6 7

B-48

Barometric Pressure Sensor Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

61
656667686970 717273
74757677787980 8182
8384

858687

8889

62

6364

D-134

(MU803804)

AK200940

BAROMETRIC
PRESSURE
SENSOR

AB

CONNECTOR: B-48

B-48(B)

AK201038AK

CONNECTORS: D-134, D-135

PCM

D-134(GR) D-135(GR)