Mitsubishi Outlander (2003+). Manual — part 111

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MFI)

13A-307

(1) Disconnect the throttle position sensor

connector and connect the special tool Test
harness (MB991536) between the
disconnected connector taking care not to
confuse the terminal to be connected.

(2) Connect digital voltmeter between the terminal

No. 2 (special tool’s yellow clip on the sensor
output) and the terminal No. 4 (special tool’s
red clip on the sensor earth) of the throttle
position sensor connector.

2. Turn the ignition switch to "ON" position (but do

not start the engine).

3. Check the output voltage of the throttle position

sensor.

Standard value: 535

-

735 mV

4. If not within the standard value, loosen the throttle

position sensor mounting bolts. Then rotate the
sensor body to adjust.

5. Turn the ignition switch to "LOCK" (OFF) position.
6. Remove the MUT-II. If the MUT-II is not used,

remove the special tool, and then connect the
throttle position sensor connector.

7. If a diagnosis code is displayed, erase the

diagnosis code by using the MUT-II or disconnect
the negative battery cable from the battery
terminal and then leave it for at least 10 seconds.
After that, reconnect the battery cable, and then
let the engine run at idle for approximately 10
minutes.

BASIC IDLE SPEED ADJUSTMENT

M1131001800468

CAUTION

œ

The standard idling speed has been adjusted
by the speed adjusting screw (SAS) by the
manufacturer, and there should usually be no
need for readjustment.

œ

If the adjustment has been changed by mis-
take, the idle speed may become too high or
the idle speed may drop too low when loads
from components such as the A/C are placed
on the engine. If this occurs, adjust by the fol-
lowing procedure.

œ

The adjustment, if made, should be made
after first confirming that the spark plugs, the
injectors, the idle speed control servo, the
compression pressure, etc., are all normal.

1. Before inspection and adjustment, set the vehicle

to the pre-inspection condition.

2. Connect the MUT-II to the diagnosis connector

(16-pin).

NOTE: When the MUT-II is connected, the diag-
nosis control terminal should be earthed.

3. Start the engine and run at idle.
4. Select the item No. 30 of the MUT-II Actuator test.

NOTE: This holds the ISC servo at the basic step
to adjust the basic idle speed.

5. Check the idle speed.

Standard value: 700

–

50 r/min

NOTE:

.

œ

The engine speed may be 20 to 100 r/min
lower than indicated above for a new vehicle
[driven approximately 500 km or less], but no
adjustment is necessary.

œ

If the engine stalls or the engine speed is low
even though the vehicle has been driven
approximately 500 km or more, it is probable
that deposits are adhered to the throttle valve,
so clean it (Refer to

3

13A

).

6. If not within the standard value range, turn the

speed adjusting screw (SAS) to make the
necessary adjustment.

AK300347AB

AK300348

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MFI)

13A-308

NOTE: If the idling speed is higher than the stand-
ard value range even when the SAS is fully
closed, check whether or not there is any indica-
tion that the fixed SAS has been moved. If there is
an indication that it has been moved, adjust the
fixed SAS.

7. Press the MUT-II clear key, and release the ISC

servo from the Actuator test mode.

NOTE: Unless the ISC servo is released, the
Actuator test mode will continue 27 minutes.

8. Turn the ignition switch to "LOCK" (OFF) position.
9. Disconnect the MUT-II.
10.Start the engine again and let it run at idle speed

for about 10 minutes; check that the idling
condition is normal.

FUEL PRESSURE TEST

M1131001900368

1. Release residual pressure from the fuel pipe line

to prevent fuel gush out (Refer to

3

13A

).

CAUTION

Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.

2. Disconnect the high-pressure fuel hose at the

delivery pipe side.

3. Assemble the fuel pressure measurement tools as

follows.

<When using the fuel pressure gauge set (spe-

cial tool)>

a. Remove the union joint and bolt from the special

tool Adaptor hose (MD998709) and attach the
special tool Hose adaptor (MD998742) to the
adaptor hose.

b. Via a gasket, install the special tool Fuel pressure

gauge set (MB991637) into the special tool that
has already assembled as described in (a)
above.

<When using the fuel pressure gauge>

a. Remove the union joint and bolt from special tool

Adaptor hose (MD998709) and attach the special
tool Hose adaptor (MD998742) to the adaptor
hose.

b. Via a suitable O-ring or gasket, install the fuel

pressure gauge to the special tool that has
already assembled as described in (a) above.

4. Install the assembled fuel pressure measurement

tools between the fuel rail and fuel high-pressure
hose.

CAUTION

To prevent damage to the MUT-ll, always turn the
ignition switch to the "LOCK" (OFF) position
before connecting or disconnecting the MUT-ll.
5. Connect the MUT-II to the diagnosis connector.
6. Turn the ignition switch to "ON" position (But do

not start the engine).

7. Select "Item No. 07" from the MUT-II Actuator test

to drive the fuel pump. Check that there are no
fuel leaks from any parts.

8. Finish the actuator test or turn the ignition switch

to "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. 270 kPa at
cerb idle

AK300349AB

AKX01458 AG

MB 991637

Gasket

MD 998709

MD 998742

High-pressure
fuel hose

Delivery
pipe

AKX01457AF

MD 998742

MD 998709

O-ring or gasket

Fuel pressure
gauge set

High-pressure
fuel hose

Delivery
pipe

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MFI)

13A-309

11.Disconnect the vacuum hose from the fuel

pressure regulator and measure fuel pressure
with the hose end closed by a finger.

Standard value: 330

-

350 kPa at cerb idle

12.Check to see that fuel pressure at idle does not

drop even after the engine has been raced several
times.

13.Racing the engine repeatedly, hold the fuel return

hose lightly with fingers to feel that fuel pressure
is present in the return hose.

NOTE: If the fuel flow rate is low, there will be no
fuel pressure in the return hose.

14.If any of fuel pressure measured in steps 10 to 13

is out of specification, troubleshoot and repair
according to the table below.

15.Stop the engine and check change of fuel

pressure gauge reading. Normal if the reading
does not drop within 2 minutes. If it does, observe
the rate of drop and troubleshoot and repair
according to the table below.

16.Release residual pressure from the fuel pipe line

(Refer to

3

13A

).

CAUTION

Cover the hose connection with rags to prevent
splash of fuel that could be caused by some
residual pressure in the fuel pipe line.
17.Remove the fuel pressure gauge and special tool

from the delivery pipe.

18.Replace the O-ring at the end of the fuel high

pressure hose with a new one. Furthermore,
apply engine oil to the new O-ring before
replacement.

19.Fit the fuel high pressure hose over the delivery

pipe and tighten the bolt to specified toque.

Tightening torque: 8.8

–

1.9 N

¼

m

20.Check for any fuel leaks by following the

procedure in step 7.

21.Disconnect the MUT-II.

AK300349AB

Symptom

Probable cause

Remedy

œ

Fuel pressure too low

œ

Fuel pressure drops after racing

œ

No fuel pressure in fuel return
hose

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

Low fuel pump delivery pressure

Replace fuel pump

Fuel pressure too high

Binding valve in fuel pressure
regulator

Replace fuel pressure regulator

Clogged fuel return hose or pipe

Clean or replace hose or pipe

Same fuel pressure when vacuum
hose is connected and when
disconnected

Damaged vacuum hose or
Clogged nipple

Replace vacuum hose or clean
nipple

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

ON-VEHICLE SERVICE

MULTIPORT FUEL INJECTION (MFI)

13A-310

FUEL PUMP CONNECTOR
DISCONNECTION (HOW TO REDUCE
PRESSURIZED FUEL LINES)

M1131000900558

WARNING

When removing the fuel pipe, etc., release
fuel pressure to prevent fuel spray.

1. Remove the rear seat assembly (Refer to GROUP

52A

-

Rear Seat Assembly

3

52A

).

2. Remove the service hole cover.

3. Disconnect the fuel pump assembly connector

<2WD> or fuel tank pump and gauge assembly
connector <4WD>.

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 assembly connector

<2WD> or fuel tank pump and gauge assembly
connector <4WD>.

6. Install the service hole cover and rear seat

assembly (Refer to GROUP 52A

-

Rear Seat

Assembly

3

52A

).

FUEL PUMP OPERATION CHECK

M1131002000584

1. Check the operating of the fuel pump by MUT-II to

force-drive the fuel pump.

2. 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 the "LOCK" (OFF)

position.

(2) Remove the rear seat assembly (Refer to

GROUP 52A,Rear Seat Assembly Removal
and Installation

3

52A

).

(3) Remove the service hole cover.

(4) Disconnect the fuel pump assembly <2WD> or

the fuel tank pump and gauge assembly
<4WD> connector.

(5) When the fuel pump drive connector is

attached directly to the battery, check if the
sound of the fuel pump operation can be
heard. If no operating sound is heard, replace
the fuel tank pump (Refer to GROUP 13A,
Fuel Pump Module Disassembly and
Assembly

3

52A

).

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.

AC102784

Service hole cover

AB

AC101011AD

Fuel pump assembly <2WD> or
fuel tank pump and gauge assembly <4WD>
connector

AC102784

Service hole cover

AB

AC101011AE

Fuel pump assembly <2WD>
or fuel tank pump and gauge assembly <4WD>
connector

AC101012

1

2

3

4

5

AD