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Mitsubishi Pajero Pinin. Manual - part 12

ENGINE <4G9-GDI> –

On-vehicle Service

11A-8

POWER STEERING OIL PUMP AND AIR CONDITIONER
COMPRESSOR DRIVE BELT TENSION CHECK AND
ADJUSTMENT

Check if the belt tension is within the standard value using
one of the methods below.

Standard value:

Items

When
checked

When
adjusted

When
replaced

Vibration
frequency
Hz

114 – 139

121 – 133

145 – 166

Tension N

392 – 588

441 – 539

637 – 834

Deflection
(Reference
value) mm

10.0 – 12.0

10.0 – 11.0

7.0 – 9.0

<When measuring the vibration frequency>

With your finger tip lightly tap the centre of the belt between
the pulleys in the location shown by the arrow in the
illustration and then measure the belt vibration frequency.

NOTE
Refer to P.11A-7 for information regarding the vibration
frequency measurement method using MUT-

<When measuring the tension>

Use a belt tension gauge to measure the belt tension.

<When measuring the deflection>

Apply 98 N of pressure against the location between the
pulleys shown by the arrow in the illustration and then
measure the deflection.

If the tension or deflection is outside the standard value,
adjust by the following procedure.

(1) Loosen tensioner pulley fixing nut A.
(2) Adjust the amount of belt deflection using adjusting

bolt B.

(3) Tighten fixing nut A.

Tightening torque: 25 Nm

(4) Check the belt deflection amount and tension, and

readjust if necessary.

Caution
Check after turning the crankshaft once or more
clockwise (right turn).

Crankshaft
pulley

Tension
pulley

A/C
compressor
pulley

Oil pump pulley

ENGINE <4G9-GDI> –

On-vehicle Service

11A-9

IGNITION TIMING CHECK

Before inspection, set the vehicle to the pre-inspection
condition.

Connect the MUT-

to the diagnosis connector.

Set the timing light to the condenser of the No.1 ignition
coil power supply line (terminal No.3).

Start the engine and run at idle.

Check that engine idle speed is within the standard value.

Standard value: 600

50 r/min

NOTE
After 4 minutes or more have passed in the idle running
condition, the idle speed will become 750 r/min.

Select No.17 of the MUT-

Actuator test.

NOTE
At this time, the engine speed will become approximately
750 r/min.

Check that basic ignition timing is within the standard value.

Standard value: 5

BTDC

If the basic ignition timing is outside the standard value,
inspect the GDI system while referring to GROUP 13A
– Troubleshooting.

Press the MUT-

clear key (Select a forced driving cancel

mode) to release the Actuator test.

Caution
If the test is not cancelled, a forced driving will continue
for 27 minutes. Driving under this condition may
damage the engine.

10. Check that ignition timing is at the standard value.

Standard value: approx. 16

BTDC

NOTE
(1) The ignition timing will become approximately 5

BTDC

after more than 4 minutes have passed since the basic
ignition timing set mode was released.

(2) The ignition timing may fluctuate within

BTDC.

This is normal.

(3) In higher altitude, the ignition timing is more advanced

than the standard value by approximately 5 degree.

MUT-

No.1 ignition coil

Condenser

ENGINE <4G9-GDI> –

On-vehicle Service

11A-10

IDLE SPEED CHECK

Before inspection, set the vehicle to the pre-inspection
condition.

Turn off the ignition switch and then connect the MUT-

to the diagnosis connector.

Check the basic ignition timing.

NOTE
Refer to P.11A-9 concerning the check procedure of the
basic ignition timing.

Standard value: 5

BTDC

Run the engine at idle for 2 minutes.

Check the idle speed. Select item No. 22 and take a reading
of the idle speed.

Standard value: 600

50 r/min

NOTE
(1) After 4 minutes or more have passed in the idle running

condition, the idle speed will become 750 r/min.

(2) The idle speed is controlled automatically by the idle

speed control system.

If the idle speed is outside the standard value, inspect the
GDI components by referring to GROUP 13A –
Troubleshooting.

IDLE MIXTURE CHECK

Before inspection, set the vehicle to the pre-inspection
condition.

Connect the MUT-

to the diagnosis connector.

Check that the basic ignition timing is within the standard
value.

NOTE
Refer to P.11A-10 concerning the check procedure of the
basic ignition timing.

Standard value: 5

BTDC

Run the engine at 2,500 r/min for 2 minutes.

Set the CO, HC tester.

MUT-

ENGINE <4G9-GDI> –

On-vehicle Service

11A-11

Check the CO contents and the HC contents at idle.

NOTE
This measurement should be performed in less than
approximately 4 minutes since the engine speed become
the idle speed.

Standard value

CO contents: 0.6% or less
HC contents: 200 ppm or less

If there is a deviation from the standard value, check the
following items:

Diagnosis output

Fuel pressure

Injector

Ignition coil, spark plug

EGR control system

Evaporative emission control system

Compression pressure

NOTE
Replace the three way catalyst when the CO and HC
contents are not within the standard value, even though
the result of the inspection is normal on all items.

COMPRESSION PRESSURE CHECK

Before inspection, check that the engine oil, starter and
battery are normal. In addition, set the vehicle to the
pre-inspection condition.

Remove all of the ignition coils and spark plugs.

Disconnect the crank angle sensor connector.

NOTE
Doing this will prevent the engine-ECU from carrying out
ignition and fuel injection.

Cover the spark plug hole with a shop towel etc., and
after the engine has been cranked, check that no foreign
material is adhering to the shop towel.

Caution
(1) Keep away from the spark plug hole when

cranking.

(2) If compression is measured with water, oil, fuel,

etc., that has come from cracks inside the cylinder,
these materials will become heated and will gush
out from the spark plug hole, which is dangerous.

Set compression gauge to one of the spark plug holes.

Crank the engine with the throttle valve fully open and
measure the compression pressure.

Standard value (at engine speed of 300 r/min):

1,720 kPa

Limit (at engine speed of 300 r/min):

Min. 1,337 kPa

Crank angle sensor
connector

Content .. 10 11 12 13 ..