Mitsubishi Pajero Pinin. Manual — part 90
GDI –
On-vehicle Service
13A-109
<When using the fuel pressure gauge>
(1) Install the fuel pressure gauge on the special tool
(for measuring the fuel pressure) putting a suitable
O-ring or gasket between them.
(2) Install the special tool which was set up in step (1)
between the high-pressure fuel hose and the fuel pump
(high pressure).
5.
Connect the MUT-
II
to the diagnosis connector.
Caution
Turn off the ignition switch before disconnecting or
connecting the MUT-
II
.
6.
Turn the ignition switch to ON. (But do not start the engine.)
7.
Select “Item No. 07” from the MUT-
II
Actuator test to drive
the fuel pump (low pressure) at the fuel tank side. Check
that there are no fuel leaks from any parts.
8.
Finish the actuator test or turn the ignition switch to OFF.
9.
Start the engine and run at idle.
10. Measure fuel pressure while the engine is running at idle.
Standard value: approximately 324 kPa
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
Fuel pressure too low
Fuel pressure drops after racing
Clogged fuel filter
Replace fuel filter
Fuel pressure drops after racing
Fuel leaking to return side due to poor
fuel pressure regulator (low pressure)
valve seating or settled spring
Replace fuel pressure regulator
(low pressure)
Low fuel pump (low pressure) delivery
pressure
Replace the fuel pump (low pressure)
Fuel pressure too high
Binding valve in fuel pressure regula-
tor (low pressure)
Replace fuel pressure regulator
(low pressure)
Clogged fuel return hose or pipe
Clean or replace hose or pipe
Fuel pressure gauge
O-ring or gasket
MD998709
MD998742
High-pressure
fuel hose
Fuel pump
(high
pressure)
GDI –
On-vehicle Service
13A-110
13. 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.
Symptom
Probable cause
Remedy
Fuel pressure drops gradually after
engine is stopped
Leaky fuel pressure regulator (low
pressure) valve seat
Replace fuel pressure regulator
(low pressure)
Fuel pressure drops sharply
immediately after engine is stopped
Check valve in fuel pump (low
pressure) is held open
Replace the fuel pump (low pressure)
14. Release residual pressure from the fuel pipe line.
NOTE
Refer to the ’00 PAJERO PININ Workshop Manual (Pub.
No. CKRE00E1) GROUP 13A – On-vehicle Service.
15. Remove the fuel pressure gauge and special tools from the
fuel pump (high pressure).
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.
16. Replace the O-ring at the end of the high-pressure fuel
hose with a new one. Furthermore, apply engine oil to
the new O-ring before replacement.
17. Fit the high-pressure fuel hose to the fuel pump (high
pressure) and tighten the mounting bolt to specified torque.
18. Check for any fuel leaks by following the procedure in
step 7.
19. Disconnect the MUT-
II
.
MEASUREMENT OF FUEL HIGH PRESSURE BETWEEN
FUEL PUMP (HIGH PRESSURE) AND INJECTORS
NOTE
Measurement of the fuel pressure between the fuel pump
(high pressure) and the injectors should be carried out after
checking that the fuel pressure between the fuel pump (low
pressure) and the fuel pump (high pressure) is normal.
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 2 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.
Check if the fuel pressure is more than 1 MPa immediately
after 20 seconds have passed since cranking was finished.
7.
If the fuel pressure is lower than 1 MPa, it means that
there is likely to be a leak in the high-pressure fuel system,
so this system should be checked.
Injector inter-
mediate harness
connector
GDI –
On-vehicle Service
13A-111
8.
Turn the ignition switch to OFF.
9.
Connect the injector intermediate harness connector.
10. Start the engine and run at idle.
11. Measure fuel pressure while the engine is running at idle.
Standard value: 4 – 6.9 MPa
12. Check to see that fuel pressure at idle does not drop even
after the engine has been raced several times.
13. If fuel pressure is out of the standard value, troubleshoot
and repair according to the table below.
Symptom
Probable cause
Remedy
Fuel pressure too low
Fuel pressure drops after racing
Fuel leaking to return side due to poor
fuel pressure regulator valve seating
or settled spring in the fuel pump (high
pressure).
Replace the fuel pump (high pres-
sure)
Low fuel pump (high pressure)
delivery pressure
Replace the fuel pump
(high pressure)
Fuel pressure too high
Clogged fuel pressure regulator valve
in the fuel pump (high pressure)
Replace the fuel pump (high pres-
sure)
Clogged fuel return hose or pipe
Clean or replace hose or pipe
14. Stop the engine and turn the ignition switch to OFF.
15. Disconnect the MUT-
II
.
GDI –
On-vehicle Service
GDI –
On-vehicle Service
13A-112
COMPONENT LOCATION
Name
Symbol
Name
Symbol
Fuel pressure sensor
C
Oxygen sensor (front)
B
Ignition failure sensor
A
Oxygen sensor (rear)
D
A
B
C
D
OXYGEN SENSOR CHECK
<Oxygen sensor (front)>
1.
Disconnect the oxygen sensor connector and connect the
special tool (test harness) to the connector on the oxygen
sensor side.
2.
Make sure that there is continuity (4.5 – 8.0
Ω
at 20
C)
between terminal 1 (red clip of special tool) and terminal
3 (blue clip of special tool) on the oxygen sensor connector.
3.
If there is no continuity, replace the oxygen sensor.
4.
Warm up the engine until engine coolant is 80
C or higher.
Oxygen sensor
(front)
Equipment side
connector
Red
MD998464
Blue
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст