Mitsubishi Outlander GS45X. Manual — part 761
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-867
FUEL TANK PUMP OPERATION CHECK
M1131002002438
Required Special Tool:
MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: M.U.T.-III USB Cable
• MB991910: M.U.T.-III Main Harness A
1. Using the scan tool MB991958, activate the fuel tank pump
(integrated in the fuel tank pump module) to check the fuel
tank pump operation.
2. If the fuel tank pump does not operate, follow the procedure
below to check the pump for operation. If it is normal, check
the driving circuit.
(1) Turn the ignition switch to the "LOCK" (OFF) position.
(2) Remove the second seat assembly (Refer to GROUP
52A, Second Seat Assembly
P.52A-25
) and turn up the
floor carpet.
(3) Remove the floor inspection lid (LH).
(4) Disconnect the fuel pump module connector.
(5) When the battery is connected to the fuel pump module
connector (fuel pump module side), check that the pump
operating sound can be heard. When the pump operating
sound cannot be heard, replace the fuel pump module
(Refer to GROUP 13C, On-Vehicle Service
− Fuel Pump
Module Replacement
) <FWD> or (Refer to
GROUP 13C, On-Vehicle Service
− Fuel Pump Module
Replacement
) <AWD>.
NOTE: The operating sound of the fuel pump is difficult to
be heard because the pump is in-tank type. Therefore,
remove the fuel filler cap to check the sound from the fuel
filler port.
(6) Connect the fuel pump module connector.
(7) Install the floor inspection lid (LH).
AC710046AB
Floor inspection lid (LH)
AC703400AB
Fuel pump module
connector
AC710087AB
Fuel pump module
connector
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-868
(8) Return the floor carpet to the original condition and install
the second seat assembly (Refer to GROUP 52A,
Second Seat Assembly
P.52A-25
).
FUEL PRESSURE TEST
M1131001901963
Required Special Tools:
• MB991958: Scan Tool (M.U.T.-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991910: Main Harness A
• MB991981: Fuel Pressure Gauge Set
• MB992001: Hose Adapter
• MB992049: Quick Connector
• MB992076: Injector Test Set
• MD998709: Hose Adapter
1. Release residual pressure from the fuel pipe 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. Assemble the special tool MB992076 (injector test set) as
shown in figure according to the following procedure.
(1) Remove the injector installation adapter from the hose.
Remove another hose together with the adapter and
remove the adapter from the remaining hose.
(2) Install the special tool MB992049 (quick connector) and
the special tool MB992001 (hose adapter) to the hose
without the adapter.
(3) Remove the nipple of the bolt of the special tool
MD998709 (hose adapter).
(4) Install the special tool prepared in the procedure (3) to
the nipple that was removed together with hose in the
procedure (1).
4. Install the special tool assembled in step 3 between the fuel
rail and the fuel high-pressure hose.
AK502612AD
AKA00404 AE
MD998709
MB992001
MB992049
MB992076
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-869
<When using the fuel pressure gauge>
a. Via a suitable O-ring or gasket, install the fuel pressure
gauge to the special tool that has already assembled as
described.
<When using the special tool MB991981 (fuel pressure
gauge set)>
a. Via a gasket, install the special tool MB991981 (fuel pres-
sure gauge set) into the special tool that has already
assembled as described.
b. Connect the leads from the fuel pressure gauge set to the
power supply (cigarette lighter socket) and special tool
MB991824 (V.C.I).
CAUTION
To prevent damage to scan tool MB991958, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991958.
5. Connect scan tool MB991958 to the data link connector.
6. Turn the ignition switch to the ON position (But do not start
the engine).
7. Use Actuator test "item number 9" to drive the fuel pump.
Check that there is no fuel leaking from any section when
the fuel pump is operating.
8. Finish the actuator test or turn the ignition switch to the
LOCK (OFF) position.
9. Start the engine and run at idle.
10.Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 324 kPa (47 psi) at
curb idle
11.Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
12.If any of fuel pressure measured in Step 10 to 11 is out of
specification, troubleshoot and repair according to the table
below.
AKA00405 AE
High-pressure
fuel hose
Fuel rail
O-ring or gasket
Fuel pressure
gauge set
AKA00406 AD
High-pressure
fuel hose
Fuel rail
Gasket
MB991981
AK700568AB
MB991824
MB991827
MB991910
Data link
connector
ON-VEHICLE SERVICE
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MULTIPORT FUEL INJECTION (MFI) <2.4L ENGINE>
13A-870
13.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.
14.Release residual pressure from the fuel pipe line. (Refer to
WARNING
To prevent a fire, cover the hose connection with
shop towels to prevent splash of fuel that could be
caused by some residual pressure in the fuel pipe
line.
15.Remove the fuel pressure gauge and special tool from the
fuel rail.
16.Fit the fuel high-pressure hose to the fuel rail.
17.Check for fuel leaks.
(1) Use scan tool MB991958 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
18.Disconnect scan tool MB991958.
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after
revving
Clogged fuel filter
Replace fuel filter
Fuel leaking to return side due to
poor fuel regulator valve seating or
settled spring
Replace fuel pressure regulator
(integrated in the fuel tank pump
module)
Low fuel pump delivery pressure
Replace fuel pump
Fuel pressure too high
Binding valve in fuel pressure
regulator
Replace fuel pressure regulator
(integrated in the fuel tank pump
module)
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
(integrated in the fuel tank pump
module)
Fuel pressure drops sharply
immediately after engine is
stopped
Check valve in fuel pump is held
open
Replace fuel pump
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