Mitsubishi Montero (2004+). Manual - part 141

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-51

STEP 13. Test the OBD-II drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to 

Diagnostic Function 

− OBD-II Drive Cycle − Procedure 6 − 

Other Monitor 

P.13A-4

.

(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0102 set?

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

DTC P0106: Manifold Absolute Pressure Circuit Range/Performance Problem

AK302421

GREEN-YELLO

W

BLUE-YELLO

W

BLA

CK

POWERTRAIN CONTROL 
MODULE (PCM)

5V

B-28

(MU802723)

MANIFOLD ABSOLUTE 
PRESSURE SENSOR

3

1

2

Manifold Absolute Pressure Sensor Circuit

97

96

101

1

2

3

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-52

.

CIRCUIT OPERATION

• A 5-volt voltage is supplied to the manifold abso-

lute pressure sensor power terminal (terminal No. 
3) from the PCM (terminal No. 97). The ground 
terminal (terminal No. 2) is grounded with PCM 
(terminal No. 96).

• A voltage that is proportional to the intake mani-

fold pressure is sent to the PCM (terminal No. 
101) from the manifold absolute pressure sensor 
output terminal (terminal No. 1).

.

TECHNICAL DESCRIPTION

• The manifold absolute pressure sensor outputs a 

voltage which corresponds to the intake manifold 
pressure.

• The PCM checks whether this voltage is within a 

specified range.

.

DESCRIPTIONS OF MONITOR METHODS
Compare load value with manifold absolute pressure 

sensor output voltage.

.

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)

• Engine coolant temperature sensor

• Throttle position sensor

.

AK200974

MANIFOLD 
ABSOLUTE
PRESSURE 
SENSOR

AD

B-28(B)

CONNECTOR: B-28

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-53

DTC SET CONDITIONS <Range/Performance problem 

− high input>

Logic Flow Chart

Check Conditions

• 8 minutes or more have passed since the starting 

sequence was completed, when the engine cool-
ant temperature at engine start is 0

°C (32°F) or 

lower.

• Engine speed is lower than 1,500 r/min.

• Throttle position sensor output voltage is lower 

than 0.8 volt.

Judgement Criteria

• Manifold Absolute pressure is 89 kPa (26.3 

in.Hg) or higher for 2 seconds.

.

START

YES

YES

YES

YES

NO

NO

NO

NO

MONITORING

CONDITIONS

PRESSURE > 89kPa (26.3in.Hg)

CONTINUOUS

FAILURE FOR 2secs

MALFUNCTION

END

GOOD

THROTTLE POSITION < =0.8V

AK302433

MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-54

DTC SET CONDITIONS <Range/Performance problem 

− low input>

Logic Flow Chart

Check Conditions

• 8 minutes or more have passed since the starting 

sequence was completed, when the engine cool-
ant temperature at engine start is 0

°C (32°F) or 

lower.

• Engine speed is lower than 1,500 r/min.

• Throttle position sensor output voltage is higher 

than 3.5 volts.

Judgement Criteria

• Manifold Absolute pressure is 45 kPa (8.3 in.Hg) 

or lower for 2 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: )

• Manifold absolute pressure sensor failed.

• Open or shorted manifold absolute pressure sen-

sor circuit, harness damage or connector dam-
age.

• PCM failed.

START

YES

YES

YES

YES

NO

NO

NO

NO

MONITORING

CONDITIONS

PRESSURE < 

45kPa (8.3in.Hg)

CONTINUOUS

FAILURE FOR 2secs

MALFUNCTION

END

GOOD

THROTTLE POSITION > =3.5V

AK302920