Mitsubishi Montero (2004+). Manual - part 334

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-823

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).

TECHNICAL DESCRIPTION

• The barometric pressure sensor outputs a volt-

age which corresponds to the barometric pres-
sure.

• The PCM checks whether this voltage is within a

specified range.

DESCRIPTIONS OF MONITOR METHODS
Barometric pressure sensor output voltage is out of

reasonable barometric pressure range.

MONITOR EXECUTION
Continuous

MONITOR EXECUTION CONDITIONS (Other
monitor and Sensor)

Other Monitor (There is no temporary DTC stored

in memory for the item monitored below)

• Not applicable

Sensor (The sensor below is determined to be

normal)

• Not applicable

AK200940

BAROMETRIC
PRESSURE
SENSOR

CONNECTOR: B-48

B-48(B)

AK201038AK

CONNECTORS: D-134, D-135

PCM

D-134(GR) D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-824

DTC SET CONDITIONS

Logic Flow Chart

Check Conditions

• 2 seconds or more have passed since the start-

ing sequence was completed.

• Battery positive voltage is higher than 8 volts.

Judgement Criteria

• Barometric pressure sensor output signal has

continued to be approximately 112.8 kPa (33.3
in.Hg) or higher (approximately 4,000 ft below
sea level) for 10 seconds.

OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function

− OBD-II Drive Cycle −

Procedure 6

− Other Monitor

P.13A-4

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )

• Barometric pressure sensor failed.

• Open barometric pressure sensor circuit, harness

damage, or connector damage.

• PCM failed.

DIAGNOSIS

Required Special Tools:

• MB991958: Scan Tool (MUT-III Sub Assembly)

• MB991824: V.C.I.

• MB991827: USB Cable

• MB991911: Main Harness B

START

END

YES

MALFUNCTION

GOOD

YES

AK302969

MONITORING

CONDITIONS

BAROMETRIC PRESSURE

< 49.5kPa (14.6in.Hg)

BAROMETRIC PRESSURE

> 112.8kPa (33.3in.Hg)

CONTINUOUS

FAILURE FOR 10secs

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-825

STEP 1. 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

P.00-6

NO : Go to Step 2.

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.

AK302970

MB991911

MB991824

MB991827

AK200937

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-826

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

P.00E-2

. Then go to Step 12.

STEP 4. Using scan tool MB991958, check data list item 25:
Barometric Pressure Sensor.

CAUTION

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 12.

AK200937

HARNESS
CONNECTOR:
COMPONENT SIDE

CONNECTOR: B-48

B-48(B)

AK200947

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

PCM

D-135(GR)

AK302970

MB991911

MB991824

MB991827

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