Mitsubishi Evolution X. Manual — part 287
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-125
STEP 8. 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 − Pattern 23
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0103 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
DTC P0106: Manifold Absolute Pressure Circuit Range/Performance Problem
AK604115
1
2
3 4 5 6 7 8 9 10 11 12 13 14 15 16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48
49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
3
2
1
AC
MANIFOLD ABSOLUTE
PRESSURE SENSOR
BLUE
3
1
2
MANIFOLD ABSOLUTE PRESSURE SENSOR CIRCUIT
B-09
B-18
(MU802723)
44
45
46
ENGINE
CONTROL
MODULE
YELLO
W
-BLUE
BLA
CK-WHITE
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-126
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the manifold abso-
lute pressure sensor power terminal (terminal No.
3) from the ECM (terminal No. 44). The ground
terminal (terminal No. 2) is grounded with ECM
(terminal No. 46).
• A voltage that is proportional to the intake mani-
fold pressure is sent to the ECM (terminal No. 45)
from the manifold absolute pressure sensor out-
put terminal (terminal No. 1).
.
TECHNICAL DESCRIPTION
• The manifold absolute pressure sensor outputs a
voltage which corresponds to the intake manifold
pressure.
• The ECM 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
• Mass airflow sensor
• Intake air temperature sensor
• Barometric pressure sensor
.
AK704227
Connector: B-09
ECM
B-09 (GR)
AB
AK704238 AB
Manifold absolute
pressure sensor
Connector: B-18
B-18 (B)
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-127
DTC SET CONDITIONS <Range/Performance problem
− high input>
Logic Flow Chart
Check Conditions
• 8 minutes or more have passed since the engine
starting sequence was completed, when the
engine coolant temperature at engine start is 0
° C
(32
° F) or lower.
• Engine speed is 1,500 r/min or lower.
• Throttle position sensor output voltage is 0.8 volt
or lower.
Judgement Criterion
• Manifold absolute pressure sensor output voltage
has continued to be 1.3 volts [corresponding to a
manifold absolute pressure of 89 kPa (26.3
in.Hg)] or higher for 2 seconds.
.
Start
Yes
Yes
Yes
No
No
No
Pressure > 89kPa (26.3in.Hg)
Continuous
failure for 2secs
Malfunction
End
Good
Monitoring
conditions
AK604311
MULTIPORT FUEL INJECTION (MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-128
DTC SET CONDITIONS <Range/Performance problem
− low input>
Logic Flow Chart
Check Conditions
• 8 minutes or more have passed since the engine
starting sequence was completed, when the
engine coolant temperature at engine start is 0
° C
(32
° F) or lower.
• Engine speed is 1,500 r/min or higher.
• Throttle position sensor output voltage is 3.5 volts
or higher.
Judgement Criterion
• Manifold absolute pressure sensor output voltage
has continued to be 0.7 volt [corresponding to a
manifold absolute pressure of 46 kPa (13.6
in.Hg)] or lower for 2 seconds.
.
FAIL-SAFE AND BACKUP FUNCTION
• None
.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− OBD-II Drive Cycle −
Pattern 6
.
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are:)
• Manifold absolute pressure sensor failed.
• Harness damage.
• Connector damage.
• ECM failed.
Start
Yes
Yes
Yes
No
No
No
Pressure <
45kPa (13.3in.Hg)
Continuous
failure for 2secs
Malfunction
End
Good
Monitoring
conditions
AK604312
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