Mitsubishi 380. Manual — part 643
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-664
3. Disconnect the fuel pump module connector.
4. After starting the engine and letting it run until it stops
naturally, turn the ignition switch to the "LOCK" (OFF)
position.
5. Connect the fuel pump module connector.
6. Install the hole cover (LHS).
Tightening torque: 1.5
± 0.5 N⋅m (14 ± 4 in-lb)
7. Install the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat Assembly
FUEL PUMP OPERATION CHECK
M1131002000692
1. If the fuel pump will not operate, check by using the
following procedure. If normal, check the fuel pump drive
circuit.
(1) Turn the ignition switch to "ON". Listen for fuel pump
running for approximately 2 seconds. Pump will
automatically stop after this time.
NOTE: As the fuel pump is an in-tank type, the fuel pump
sound is hard to hear. Remove the fuel tank filler tube cap
and check from the tank inlet.
(2) Remove the rear seat cushion assembly (Refer to
(3) Remove the hole cover (LHS).
AC306490
FUEL PUMP MODULE
CONNECTOR
AB
03DB150A
HOLE COVER
03DB150A
HOLE COVER
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-665
(4) Disconnect the fuel pump module connector.
(5) Attach 12 Volt supply to fuel pump, terminal no. 4 to earth
and terminal no.5 to power. Check if the sound of the fuel
pump operation can be heard. If no operating sound is
heard, replace the fuel pump module (Refer to GROUP
13B, On-vehicle Service
− Fuel Pump Module
Replacement
).
NOTE: As the fuel pump is an in-tank type, the fuel pump
sound is hard to hear. Remove the fuel tank filler tube cap
and check from the tank inlet.
(6) Check for fuel pressure by pinching the fuel hose with
fingertips.
(7) Connect the fuel pump module connector.
(8) Install the hole cover (LHS).
Tightening torque: 1.5
± 0.5 N⋅m (14 ± 4 in-lb)
(9) Install the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat Assembly
AC306490
FUEL PUMP MODULE
CONNECTOR
AB
1 2 3
4 5
AC305681
03DB150A
HOLE COVER
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-666
MULTIPORT FUEL INJECTION (MPI) RELAY
CONTINUITY CHECK
M1131050000345
Inspect the MPI relay relay for continuity in accordance with the
chart shown below.
FUEL PUMP RELAY CONTINUITY CHECK
M1131033000342
Inspect the fuel pump relay for continuity in accordance with
the chart shown below.
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED TO
BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
2
− 3
Supplied
2
− 3
1
− 4
03DB258A
1 2
3 4
1 2
3 4
MPI RELAY
SIDE CONNECTOR
MPI RELAY
SIDE CONNECTOR
BATTERY
VOLTAGE
TERMINAL NO.
TO BE
CONNECTED TO
BATTERY
TERMINAL NO.
TO BE
CONDUCTED
Not supplied
−
2
− 3
Supplied
2
− 3
1
− 4
1 2
3
2
3 4
1
4
AK302122
FUEL PUMP RELAY
SIDE CONNECTOR
FUEL PUMP RELAY
SIDE CONNECTOR
AB
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-667
INTAKE AIR TEMPERATURE SENSOR CHECK
M1131002800557
1. Disconnect the mass airflow sensor connector.(Refer to
GROUP 15, Air Cleaner, Removal and Installation
)
2. Measure resistance between terminals 1 and 3.
Standard value:
12.66
− 15.12 kΩ [at -20°C (-4°F)]
5.119
− 5.892 kΩ [at 0°C (32°F)]
2.290
− 2.551 kΩ [at 20°C (68°F)]
1.096
− 1.258 kΩ [at 40°C (104°F)]
0.565
− 0.654 kΩ [at 60°C (140°F)]
0.312
− 0.370 kΩ [at 80°C (176°F)]
3. If not within specifications, replace the mass airflow sensor.
4. Measure resistance while heating the sensor using a hair
dryer.
Normal condition:
5. If resistance does not decrease as heat increases, replace
the mass airflow sensor.
CAUTION
Do not remove Air Temperature Sensor unit from the
housing. If sensor is faulty replace complete Air Flow Sen-
sor assembly.
ENGINE COOLANT TEMPERATURE SENSOR
CHECK
M1131003100528
CAUTION
Be careful not to touch the connector (resin section) with
the tool when removing and installing.
1. Drain engine coolant, then remove the engine coolant
temperature sensor.
2. With the temperature sensing portion of engine coolant
temperature sensor immersed in hot water, check the
resistance.
Standard value:
14
− 17 kΩ [at -20°C (-4°F)]
5.5
− 6.3 kΩ [at 0°C (32°F)]
2.35
− 2.65 kΩ [at 20°C (68°F)]
1.12
− 1.23 kΩ [at 40°C (104°F)]
0.573
− 0.618 kΩ [at 60°C (140°F)]
0.313
− 0.332 kΩ [at 80°C (176°F)]
TEMPERATURE
RESISTANCE (k
Ω)
Higher
Smaller
03DB158A
INTAKE AIR TEMPERATURE
SENSOR CONNECTOR
03DB177A
MASS AIRFLOW
SENSOR
AKX01622
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