Mitsubishi Pajero Pinin. Manual — part 57
GDI –
On-vehicle Service
13A-94
ACCELERATOR PEDAL POSITION SENSOR
ADJUSTMENT
Caution
(1) Never attempt to tamper the accelerator pedal position
sensor. The sensor position is precisely adjusted at
factory.
(2) Should it be tampered, follow the procedure below:
1.
Connect the MUT-
II
to the diagnosis connector.
When not using the MUT-
II,
proceed as follows:
(1) Disconnect the accelerator pedal position sensor
connector. Connect the special tool (test harness:
MB991658) between the disconnected connectors,
and then connect the digital voltmeter to the terminal
No.3 [output terminal of accelerator pedal position
sensor (1st channel)] and to the terminal No.1 [earth
terminal of accelerator pedal position sensor (1st
channel)].
2.
Loosen the accelerator pedal position sensor installation
bolts.
3.
Contact the accelerator pedal arm to the stopper.
4.
Turn the ignition switch to the ON position (but do not
start the engine).
5.
Rotate the accelerator pedal position sensor with the knock
pin as the centre, and adjust the output voltage of the
accelerator pedal position sensor (1st channel) to the
standard value.
Standard value: 0.935 – 1.135 V
6.
Tighten the accelerator pedal position sensor installation
bolts fully.
Equipment
side connector
Accelerator pedal
position sensor
Accelerator
pedal arm
MB991658
Accelerator pedal
position sensor
Stopper
Accelerator
pedal arm
Accelerator
pedal assembly
Accelerator pedal
position sensor
Knock pin
GDI –
On-vehicle Service
13A-95
FUEL PRESSURE TEST
MEASUREMENT OF FUEL LOW PRESSURE BETWEEN
FUEL PUMP (LOW PRESSURE) AND FUEL PUMP
(HIGH PRESSURE)
1.
Release residual pressure from the fuel pipe line to prevent
fuel gush out. (Refer to P.13A-99.)
2.
Disconnect the high-pressure fuel hose at the fuel pump
(high pressure) side.
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.
3.
Remove the union joint and bolt from the special tool
(adapter hose) and instead attach the special tool (hose
adapter) to the adapter hose.
4.
Install the special tool (for measuring the fuel pressure)
that was set up in step 3.
<When using the fuel pressure gauge set (special tool)>
(1) Install the special tool (for measuring the fuel pressure)
between the high-pressure fuel hose and the fuel pump
(high pressure).
(2) Install the fuel pressure gauge set (special tool) on
the special tool (for measuring the fuel pressure)
putting the gasket between them.
(3) Connect the lead wire of the fuel pressure gauge set
(special tool) to the power supply (cigarette lighter
socket) and to the MUT-
II
.
<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).
Fuel pump
(high pressure)
High-pressure
fuel hose
MD998709
MD998742
Fuel
pump
(high
pressure)
Gasket
High-pressure
fuel hose
MB991637
Fuel pressure gauge
O-ring or gasket
MD998709
MD998742
High-pressure
fuel hose
Fuel pump
(high
pressure)
GDI –
On-vehicle Service
13A-96
5.
Connect the MUT-
II
to the diagnosis connector.
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 328 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
D
Fuel pressure too low
D
Fuel pressure drops after racing
Clogged fuel filter
Replace fuel filter
D
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
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)
GDI –
On-vehicle Service
GDI –
On-vehicle Service
13A-97
14. Release residual pressure from the fuel pipe line. (Refer to
P.13A-99.)
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.
Crank the engine, and then measure the 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 the ignition switch to OFF.
8.
Connect the injector intermediate harness connector.
Injector
intermediate
harness
connector
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