Mitsubishi Montero Sport (2004+). Manual - part 368

 

  Index      Mitsubishi     Mitsubishi Montero Sport - service repair manual 2004 year

 

Search            

 

 

 

 

 

 

 

  

 

Content   ..  366  367  368  369   ..

 

 

Mitsubishi Montero Sport (2004+). Manual - part 368

 

 

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-885

<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 (79.7 in.Hg) 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 (97 − 103 in.Hg) 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.

AKX01458

MB991637

O-RING OR GASKET

MD998709

MD998742

FUEL
RAIL

AI

FUEL
HIGH-PRESSURE
HOSE

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AKX01459AB

NIPPLE

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-886

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 

P.13A-887

.)

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.

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-887

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 N

⋅m (43 in-lb)

18.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.

19.Turn the ignition switch to the "LOCK" (OFF) position.
20.Disconnect scan tool MB991958.

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

M1131000900428

When removing the fuel pipe, hose, etc., release fuel pressure 
to prevent fuel splay.
1. Disconnect the fuel pump relay connector.
2. Start the engine and let it run until it stops naturally. Turn the 

ignition switch to "LOCK" (OFF).

3. Connect the fuel pump relay.

AC002589

FUEL PUMP
RELAY

AE

ON-VEHICLE SERVICE

TSB Revision

MULTIPORT FUEL INJECTION (MFI)

13A-888

FUEL PUMP OPERATION CHECK

M1131002000755

Required Special Tool:

• MB991958: Scan tool (MUT-III sub assembly)

• MB991824: V.C.I.

• MB991827: MUT-III USB cable

• MB991911: MUT-III main harness B

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. 
1. Check the operating of the fuel pump by using scan tool 

MB991958 to force-drive the fuel pump.

2. If the fuel pump will not operate, check by using the 

following procedure, and if it is normal, check the drive 
circuit.

(1) Turn the ignition switch to the "LOCK" (OFF) position.

(2) Remove the fuel pump relay connector. 

Connect the terminal number 1 of the harness-side 
connector to the battery.
Check if the fuel pump operation sound can be heard at 
this time.
NOTE: As the fuel pump is an in-tank type, the fuel pump 
sound is hard to hear, so remove the fuel filler cap and 
check from the tank inlet.

3. Check the fuel pressure by pinching the fuel hose with the 

fingertips.

AK303629AB

MB991911

MB991827

MB991824 

16-PIN

AC203142

1

2

3

4

AB

FUEL PUMP 
RELAY

HARNESS SIDE CONNECTOR:
COMPONENT SIDE

 

 

 

 

 

 

 

Content   ..  366  367  368  369   ..