Mitsubishi Montero (2002-2004). Manual — part 556
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13Aa-11
THROTTLE BODY CLEANING
M1131001000246
1. Start the engine and warm it up until the coolant is heated to
80
°C (176°F) or higher. Stop the engine.
2. Remove the air intake hose from the throttle body.
3. Spray cleaning solvent into the valve through the throttle
body intake port and leave it for approximately five minutes.
4. Start the engine, rev it several times and then idle it for about
one minute. If the idling speed becomes unstable (or if the
engine stalls) due to the bypass passage being plugged,
slightly open the throttle valve to keep the engine running.
5. If the throttle valve deposits are not removed, repeat steps 3
and 4.
6. Unplug the bypass passage inlet.
7. Attach the air intake hose.
8. Use scan tool MB991502 to erase any diagnostic trouble
code.
AK201059 AC
X
EVAPORATIVE
EMISSION
VENTILATION
SOLENOID
AK201275AC
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
RIGHT BANK
HEATED OXYGEN
SENSOR (REAR)
CONNECTOR
Y
AK201288
TRANSMISSION
RANGE SWITCH
AC
Z
AK201308
FUEL SENSOR
(INCORPORATING
FUEL TEMPERATURE
SENSOR)
AB
a
FUEL TANK DIFFERENTIAL
PRESSURE SENSOR
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13Aa-12
ACCELERATOR PEDAL POSITION SENSOR
ADJUSTMENT
M1131050500016
Required Special Tools:
• MB991658: Test Harness Set
CAUTION
1. The accelerator pedal position sensor should not be
moved unnecessarily; it has been precisely adjusted by
the manufacture. If the adjustment is disturbed for any
reason, readjust as follows.
2. If the adjustment is disturbed for any reason, readjust
as follows.
1. Remove the accelerator pedal complete.
2. Connect the scan tool MB991502 to the data link connector.
If the can tool MB991502 is not used, carry out the following
steps.
(1) Disconnect the accelerator pedal position sensor
connector, and connect the special tool (test harness:
MB991658) to that connector. (Be careful not to confuse
the terminal numbers.)
(2) Connect a digital voltmeter between accelerator pedal
position sensor connector terminal No. 3 accelerator
pedal position sensor (main) output and terminal No. 3
accelerator pedal position sensor (main) earth.
3. Loosen the accelerator pedal position sensor mounting
bolts, and hold the accelerator pedal position sensor
temporary.
4. Check that the accelerator pedal arm touches the full-closed
stopper.
5. Adjust the pedal arm by the adjusting screw so that
clearance "A" (see the illustration) is 0.5
− 0.93 mm (0.020 −
0.037 in).
6. Hold the adjusting screw with the lock nut.
7. Turn the ignition switch to the ON position. (but do not start
the engine.)
8. Turn the accelerator pedal position sensor until the output
from accelerator pedal position sensor (main) satisfies the
standard value.
Standard value: 0.905
− 1.165 volts
9. Tighten the accelerator pedal position sensor mounting bolts
securely.
10.Install the accelerator pedal complete.
1 2 3 4 5 6 7 8
AK201309 AB
Equipment side
connector
ACCELERATOR PEDAL
POSITION SENSOR
ACCELERATOR
PEDAL
AK201310 AB
ACCELERATOR PEDAL
POSITION SENSOR
MB991658
AK201311
ACCELERATOR
PEDAL POSITION
SENSOR
ACCELERATOR
PEDAL ARM
ADJUSTING
SCREW
FULL-CLOSED
STOPPER
CLEARANCE
"A"
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13Aa-13
FUEL PRESSURE TEST
M1131001900238
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MB991637: Fuel Pressure Gauge Set
• MD998709: Adaptor Hose
• MD998742: Hose Adaptor
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. Assemble the fuel pressure measurement tools as follows.
<When using the fuel pressure gauge>
1. Remove the union joint and bolt from special tool
MD998709 (adapter hose) and instead attach special tool
MD998742 (hose adapter) to the adapter hose.
2. Place a suitable O-ring or gasket on the assembled special
tools MD998709 and MD998742 and install the fuel pres-
sure gauge.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and fuel high-pressure hose.
<When using special tool MB991637 (fuel pressure gauge
set)>
1. Remove the union joint and bolt from special tool
MD998709 (adapter hose) and instead attach special tool
MD998742 (hose adapter) to the adapter hose.
2. Install special tool MB991637 (fuel pressure gauge set) into
assembled special tools MD998709 and MD998742 via a
gasket.
3. Install the assembled fuel pressure measurement tools
between the fuel rail and fuel high-pressure hose.
AK201312AB
HIGH-PRESSURE
FUEL HOSE
AKX01457AB
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
HIGH-PRESSURE
FUEL HOSE
FUEL
RAIL
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
HIGH-
PRESSURE
FUEL HOSE
FUEL
RAIL
AB
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13Aa-14
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
4. Connect scan tool MB991502 to the data link connector.
5. Use Actuator test 07 to drive the fuel pump. Check that there
is no fuel leaking from any section when the fuel pump is
operating.
6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 270 kPa (38 psi) at
curb idle
9. Disconnect the vacuum hose (blue stripe) from the fuel
pressure regulator and measure the fuel pressure with the
hose end closed with your finger.
Standard value: 330
− 350 kPa (47 − 50 psi) at curb idle
10.Check to see that fuel pressure at idle does not drop even
after the engine has been revved several times.
11.Revving the engine repeatedly, hold the fuel return hose
lightly with your 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 pres-
sure in the return hose.
12.If any of fuel pressure measured in steps 8 to 11 is out of
specification, troubleshoot and repair according to the table
below.
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.
(1) Squeeze the fuel return line closed to confirm leak-down
occurs from defective fuel pressure regulator.
SYMPTOM
PROBABLE CAUSE
REMEDY
• Fuel pressure too low
• Fuel pressure drops after racing
• 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
Defective fuel pressure regulator
Replace fuel pressure regulator
ACX01539
16-PIN
MB991502
AC
AK201313AB
NIPPLE
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