Mitsubishi 380. Manual — part 504
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-108
STEP 9. Measure the sensor output voltage at
ENGINE-ECU connector B-20 by using ECU check
harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect
ECU check harness special tool MB992044 between the
separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 41 of
ENGINE-ECU check harness and ground.
• When altitude is 0 m, voltage should be 4.01 to 4.15
volts.
• When altitude is 600 m, voltage should be 3.76 to 3.92
volts.
• When altitude is 1,200 m, voltage should be 3.45 to 3.62
volts.
• When altitude is 1,800 m, voltage should be 3.2 to 3.3
volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage correct?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Replace the sensor. Then go to Step 12.
STEP 12. Test the EOBD drive cycle.
(1) Carry out a test drive with the drive cycle pattern. Refer to
Diagnostic Function
− EOBD Drive Cycle −
.
(2) Check the diagnostic trouble code (DTC).
Q: Is DTC P0107 set?
YES : Retry the troubleshooting.
NO : The inspection is complete.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB224A
B-20 HARNESS
CONNECTOR
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-109
DTC P0108: Manifold Absolute Pressure Circuit High Input.
.
CIRCUIT OPERATION
• A 5-volt voltage is supplied to the manifold abso-
lute pressure sensor power terminal (terminal No.
3) from ENGINE-ECU (terminal No. 25). The
ground terminal (terminal No. 2) is grounded with
ENGINE-ECU (terminal No. 12).
• A voltage that is proportional to the intake mani-
fold pressure is sent to the ENGINE-ECU (termi-
nal No. 41) 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 ENGINE-ECU checks whether this voltage is
within a specified range.
.
DTC SET CONDITIONS
Check Conditions
• None
Judgement Criteria
• MAP sensor output voltage is above 4.88 V for 2
seconds.
.
EOBD DRIVE CYCLE PATTERN
Refer to Diagnostic Function
− EOBD Drive Cycle −
.
TROUBLESHOOTING HINTS (The most
likely causes for this code to be set are: )
• Refer to component locations GROUP-
• Refer to configuration diagrams GROUP-
• Refer to circuit diagrams GROUP-
• Manifold absolute pressure sensor failed.
• Open manifold absolute pressure sensor circuit,
or connector damage.
• ENGINE-ECU failed.
DIAGNOSIS
Required Special Tools:
• : Diagnostic Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
1
2
3
CONNECTOR: B-02
03DB223A
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
INTAKE
MANIFOLD
B-02 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-110
STEP 1. Measure the sensor output voltage at
ENGINE-ECU connector B-20 by using ECU check
harness special tool MB992044.
(1) Disconnect the all ENGINE-ECU connectors and connect
ECU check harness special tool MB992044 between the
separated connectors.
(2) Turn the ignition switch to the "ON" position.
(3) Measure and record the voltage between terminal No. 41 of
ENGINE-ECU check harness and ground.
• When altitude is 0 m, voltage should be 4.01 to 4.15
volts.
• When altitude is 600 m, voltage should be 3.76 to 3.92
volts.
• When altitude is 1,200 m, voltage should be 3.45 to 3.62
volts.
• When altitude is 1,800 m, voltage should be 3.2 to 3.3
volts.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage correct?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use
Troubleshooting/Inspection Service Points
− How to
Cope with Intermittent Malfunctions
.
NO : Go to Step 2.
16DB400A
COVER
ENGINE
CONTROL
UNIT
AIR
CLEANER
03DB224A
B-20 HARNESS
CONNECTOR
MULTIPOINT FUEL INJECTION (MPI) DIAGNOSIS
MULTIPOINT FUEL INJECTION (MPI)
13A-111
STEP 2. Measure the ground voltage at manifold absolute
pressure sensor connector B-02 by backprobing.
(1) Do not disconnect the connector B-02.
(2) Turn the ignition switch to the "ON" position.
(3) Measure the voltage between terminal No. 2 and ground by
backprobing.
• Voltage should be 0.5 volt or less.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the measured voltage 0.5 volt or less?
YES : Go to Step 6.
NO : Go to Step 3.
1
2
3
CONNECTOR: B-02
03DB223A
MANIFOLD
ABSOLUTE
PRESSURE
SENSOR
INTAKE
MANIFOLD
B-02 (B)
HARNESS
CONNECTOR:
COMPONENT SIDE
3
2
1
AK303030
B-02 HARNESS
CONNECTOR:
HARNESS SIDE
AB
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