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
(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
.
.
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
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