Mitsubishi 380. Manual — part 642
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-660
ON-VEHICLE SERVICE
COMPONENT LOCATION
• Refer to component locations GROUP
THROTTLE BODY (THROTTLE VALVE AREA)
CLEANING
M1131001000503
WARNING
If the air intake duct is removed from the throttle
body take great care to keep fingers away from the
throttle plate. The drive motor has very high torque
and is capable of random movement at any time. Do
not under any circumstance activate the throttle plate
by hand.
When removing the throttle body from the intake
manifold disconnect the wiring first.During replace-
ment connect the wiring last.
Do not activate the throttle body using a DC supply to
test the motor, as permanent damage to the throttle
body will result.
1. Remove the throttle body.
CAUTION
• Do not spray the cleaning solvent directly to the throttle
valve.
• Make sure the cleaning solvent does not enter the
motor and the sensor through the shaft.
2. Spray cleaning solvent on a clean cloth.
3. Wipe off the dirt around the throttle valve with the cloth
sprayed with cleaning solvent.
4. Attach the throttle body.
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-661
FUEL PRESSURE TEST
M1131001900584
Required Special Tools:
• Diagnostic tool(MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991637: Fuel Pressure Gauge Set
•
TBA: Adaptor Hose
1. Release residual pressure from the fuel line to prevent fuel
spray. (Refer to
.)
WARNING
To prevent a fire, cover the hose connection with
shop towels to prevent splashing of fuel that could be
caused by some residual pressure in the fuel pipe
line.
2. Disconnect the fuel high-pressure hose at the fuel rail side.
3. Disconnect the fuel high pressure hose at the fuel pipe side
by unclipping and rotating up the stopper then releasing the
quick release fitting. Remove the high pressure hose from
vehicle.
<When using the fuel pressure gauge>
1. Use a suitable 1/4" BSP adaptor between fuel hose and
Gauge. Attach the gauge and fitting to the adaptor hose.
2. Install the assembled fuel pressure measurement tools to
the vehicle between the fuel rail and fuel pipe. For correct
hose fittment Refer to Fuel Hose Installation
03DB145A
FUEL
HIGH-PRESSURE
HOSE
03DB254A
FUEL
HIGH-PRESSURE
HOSE
FUEL PIPE
STOPPER
03DB255A
FUEL
HIGH-PRESSURE
ADAPTOR HOSE
FUEL PRESSURE
GAUGE
O-RING OR GASKET
1/4” BSP ADAPTOR
FUEL
RAIL
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-662
<When using special tool MB991637 (fuel pressure gauge
set)>
1. Use a suitable 1/4" BSP adaptor between fuel hose and
special tool MB991637. Attach the special tool and fitting to
the adaptor hose.
2. Install the assembled fuel pressure measurement tools to
the vehicle between the fuel rail and fuel pipe. For correct
hose fittment Refer to Fuel Hose Installation
4. Turn the Ignition to "ON" listen for fuel pump actuation (
Approx. 2 seconds). Check that there is no fuel leaking from
any section when the fuel pump is operating.
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.
5. Start the engine and run at idle.
6. Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 324 kPa (95.7 in.Hg) at
curb idle
7. Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
8. If any of fuel pressure measured in steps 8 to 9 is out of
specification, troubleshoot and repair according to the table
below.
9. Stop the engine and observe fuel pressure gauge reading. It
is normal if the reading does not drop within two minutes. If it
does, observe the rate of drop and troubleshoot and repair
according to the table below. Start, then stop the engine.
(1) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(2) If pressure continues to drop with both fuel lines
squeezed closed, injector(s) are leaking.
03DB256A
FUEL
HIGH-PRESSURE
ADAPTOR HOSE
O-RING OR GASKET
1/4” BSP ADAPTOR
FUEL
RAIL
MB991637
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after racing
Clogged fuel filter
Replace fuel filter
Fuel leaking to return side due to
poor fuel regulator valve seating or
settled spring
Replace fuel pump
Low fuel pump delivery pressure
Replace fuel pump
Fuel pressure too high
Binding valve in fuel pressure
regulator
Replace fuel pump
ON-VEHICLE SERVICE
MULTIPORT FUEL INJECTION (MPI) <3.8L ENGINE>
13A-663
10.Release residual pressure from the fuel pipe line. (Refer to
WARNING
Cover the hose connection with shop towels to pre-
vent splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
11.Remove the fuel pressure gauge, and special tools from the
fuel rail.
12.Insert fuel hose quick connector onto fuel rail pipe, taking
care not to damage or dislodge O-ring. Push connector onto
pipe firmly and depress clip to attach. Check that connector
does not dislodge when pulled firmly.
13.Check for fuel leaks.
(1) Turnthe ignition to "ON" to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900622
WARNING
When removing the fuel pipe, etc., release fuel pres-
sure to prevent fuel spray.
1. Remove the rear seat cushion assembly (Refer to GROUP
52A, Rear Seat
2. Remove the hole cover (LHS).
SYMPTOM
PROBABLE CAUSE
REMEDY
Fuel pressure drops gradually
after engine is stopped
Leaky injector
Replace injector
Leaky fuel regulator valve seat
Replace fuel pressure regulator
Fuel pressure drops sharply
immediately after engine is
stopped
Check valve in fuel pump is held
open
Replace fuel pump
03DB150A
HOLE COVER
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