Mitsubishi Pajero Pinin. Manual - part 58

GDI – 

On-vehicle Service

13A-98

9.

Start the engine and run at idle.

10. Measure fuel pressure while the engine is running at idle.

Standard value: approximately 4 – 6.9 MPa

11. Check to see that fuel pressure at idle does not drop

even after the engine has been raced several times.

12. If fuel pressure is out of the standard value, troubleshoot

and repair according to the table below.

Symptom

Probable cause

Remedy

D

Fuel pressure too low

D

Fuel pressure drops after racing

Fuel leaking to return side due to poor
fuel pressure regulator (high pres-
sure) valve seating or settled spring

Replace fuel pressure regulator 
(high pressure)

Low fuel pump (high pressure)
delivery pressure

Replace the fuel pump 
(high pressure)

Fuel pressure too high

Binding valve in fuel pressure regula-
tor (high pressure)

Replace fuel pressure regulator 
(high pressure)

Clogged fuel return hose or pipe

Clean or replace hose or pipe

13. Stop the engine and turn the ignition switch to OFF.
14. Disconnect the MUT-

II

.

GDI – 

On-vehicle Service

13A-99

FUEL LEAK CHECK

1.

Connect the MUT-

II

 to the diagnosis connector.

2.

Disconnect the injector intermediate harness connector.

3.

Turn the ignition switch to ON.

4.

Select “Item No.74” from the MUT-

II

 Data list.

5.

Crank the engine continuously for two seconds or more,
and visually check that there are no fuel leaks from any
parts.

Caution
If any fuel leaks appear, stop cranking immediately
and repair the source of the leak.

6.

Crank the engine, and then measure fuel pressure
immediately after 20 seconds.

Limit: Minimum 1 MPa

Caution
If the fuel pressure is less than 1 MPa, there may
be a partial fuel leak in the high-pressure fuel system.

7.

Turn off the ignition switch.

8.

Reconnect the injector intermediate connector.

9.

Remove the MUT-

II

.

FUEL PUMP CONNECTOR DISCONNECTION
(HOW TO REDUCE FUEL PRESSURE)

When removing the fuel pipe, hose, etc., since fuel pressure
in the fuel pipe line is high, do the following operation so
as to release fuel pressure in the line and prevent fuel from
running out.
1.

Remove the fuel filler cap to release pressure in the fuel
tank.

2.

Remove the fuel pump relay.

3.

Connect the MUT-

II

 to the diagnosis connector.

Caution
Turn off the ignition switch before disconnecting or
connecting the MUT-

II

.

4.

Turn off the ignition switch.

5.

Select “Item No.74” from the MUT-

II

 Data list.

6.

Crank the engine for at least two seconds.

7.

If the engine is not be started, use the MUT-

II

 to make

sure that the fuel pressure is 0.5 MPa or less. Then turn
off the ignition switch.

Injector
intermediate
harness
connector

Fuel pump relay

GDI – 

On-vehicle Service

13A-100

8.

If the engine is started, release fuel pressure by the
following procedure:
(1) Turn off the ignition switch, and then stop the engine.
(2) Disconnect one of the ignition coil connectors.
(3) Crank the engine for at least two seconds.
(4) If the engine is not be started, use the MUT-

II

 to make

sure that the fuel pressure is 0.5 MPa or less. Then
turn off the ignition switch.

(5) If the engine is started, stop it by racing and use the

MUT-

II

 to make sure that the fuel pressure is 0.5

MPa or less. Then turn off the ignition switch.

(6) Reconnect the ignition coil connector.

Caution
Clean the spark plug which corresponds to the
disconnected ignition coil connector.

9.

Remove the MUT-

II

.

10. Install the fuel pump relay.

FUEL PUMP OPERATION CHECK

1.

Check the operation of the fuel pump by using the MUT-

II

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 off the ignition switch.
(2) Remove the fuel pump relay. Connect the terminal

No.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.

Fuel pump relay connector

GDI – 

On-vehicle Service

13A-101

COMPONENT LOCATION

Name

Symbol

Name

Symbol

A/C relay

A

Fuel pressure sensor

F

A/C switch

P

Fuel pump relay

A

Accelerator pedal position sensor (1st and 2nd
channels)

Q

Ignition coil

I

channels)

Inhibitor switch <A/T>

J

Air flow sensor (with intake air temperature
sensor and barometric pressure sensor)

N

Injectors

G

sensor and barometric pressure sensor)

Injector driver

B

Camshaft position sensor

H

Injector driver relay

A

Crank angle sensor

E

Oxygen sensor

U

Detonation sensor

K

Power steering fluid pressure switch

M

Diagnosis connector

R

Purge control solenoid valve

C

EGR valve

F

Throttle position sensor

D

Engine control relay

A

Throttle valve controller

S

Engine coolant temperature sensor

L

Throttle valve control servo

D

Engine-ECU

S

Throttle valve control servo relay

T

Engine warning lamp (CHECK ENGINE lamp)

O

Vehicle speed sensor

J

A

O

P

Q

R

S

U

B

C

D E F

G

H

I

J

K L

M N

T

Q

R

S

T

O

P

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