Mitsubishi Montero (2004+). Manual — part 377
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-995
4. Check that the accelerator pedal arm touches the full-closed
stopper.
5. Turn the ignition switch to the ON position. (but do not start
the engine.)
6. 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
7. Tighten the accelerator pedal position sensor mounting bolts
to specified torque.
Tightening torque: 3.5
± 1.0 N⋅m (31 ± 8 in-lb)
8. Install the accelerator pedal complete.
FUEL PRESSURE TEST
M1131001900573
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: USB Cable
• MB991911: Main Harness B
• 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.
AK302917
ACCELERATOR
PEDAL POSITION
SENSOR
ACCELERATOR
PEDAL ARM
FULL-CLOSED
STOPPER
AB
3.5 ± 1.0 N·m
31 ± 8 in-lb
AK201312AC
FUEL HIGH-
PRESSURE
HOSE
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-996
<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.
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.
4. Connect scan tool MB991958 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.
AKX01457AH
FUEL PRESSURE
GAUGE
O-RING OR GASKET
MD998709
MD998742
FUEL
RAIL
FUEL
HIGH-PRESSURE
HOSE
AKX01458
MB991637
O-RING OR GASKET
MD998709
MD998742
FUEL
RAIL
AI
FUEL
HIGH-PRESSURE
HOSE
AK302970
AB
MB991911
MB991824
MB991827
AK201313AB
NIPPLE
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-997
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.
(2) Squeeze the fuel supply line closed to confirm leak-down
occurs from defective fuel pump check valve.
(3) If pressure continues to drop with both fuel lines
squeezed closed, injector(s) are leaking.
14.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.
15.Remove the fuel pressure gauge, and special tools
MD998709, MD998742 and MB991637 from the fuel rail.
16.Replace the O-ring at the end of the fuel high-pressure hose
with a new one.
17.Fit the fuel high-pressure hose into the fuel rail and tighten
the bolts to specified torque.
Tightening torque: 4.9
± 1.0 N⋅m (43 ± 8 in-lb)
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
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
AKX01460AC
FUEL
RAIL
FUEL HIGH-
PRESSURE
HOSE
MD998742
MD998709
ON-VEHICLE SERVICE
TSB Revision
MULTIPORT FUEL INJECTION (MFI)
13A-998
18.Check for fuel leaks.
(1) Use scan tool MB991502 to operate the fuel pump.
(2) Check the fuel line for leaks and repair as needed.
19.Disconnect scan tool MB991958.
FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE PRESSURIZED FUEL LINES)
M1131000900677
When removing the fuel pipe, hose, etc., release fuel pressure
to prevent fuel splay.
1. Turn the ignition switch to the "LOCK" (OFF) position.
2. Fold down the second seat.
3. Remove the service hole cover (upper) and packing.
4. Remove the service hole cover (lower) and packing.
5. Disconnect fuel pump module connector.
6. Start the engine and let it run until it stops naturally. Turn the
ignition switch to the "LOCK" (OFF) position.
7. Connect the fuel pump module connector.
FUEL PUMP OPERATION CHECK
M1131002000744
Required Special Tools:
• MB991958: Scan Tool (MUT-III Sub Assembly)
• MB991824: V.C.I.
• MB991827: MUT-III USB Cable
• MB991911: MUT-III Main Harness B
ACX00218 AM
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст