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Mitsubishi Pajero Pinin. Manual - part 24

ENGINE <4G9-MPI> –

On-vehicle Service

11B-7

ALTERNATOR DRIVE BELT TENSION ADJUSTMENT

Loosen the nut of the alternator pivot bolt.

Loosen the lock bolt.

Use the adjusting bolt to adjust the belt tension and belt
deflection to the standard values.

Standard value:

Items

When adjusted

When replaced

Vibration frequency Hz

155 – 175

203 – 234

Tension N

343 – 441

588 – 784

Deflection
(Reference) mm

10.5 – 12.0

6.7 – 8.5

Tighten the nut of the alternator pivot bolt.

Tightening torque: 44

10 N·m

Tighten the lock bolt.

Tightening torque: 23

2 N·m

Tighten the adjusting bolt.

Tightening torque: 5.0

1.0 N·m

POWER STEERING OIL PUMP DRIVE BELT <Vehicles
without A/C>, POWER STEERING OIL PUMP AND A/C
COMPRESSOR DRIVE BELT <Vehicles with A/C> 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 – 833

Deflection
(Reference)
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.11B-6 for information regarding the vibration
frequency measurement method using MUT-

<When measuring the tension>

Use a belt tension gauge to measure the belt tension.

Adjusting bolt

Lock bolt

<Vehicles without A/C>

<Vehicles with A/C>

Oil pump pulley

Crankshaft
pulley

Tension
pulley

Oil pump pulley

Crankshaft
pulley

Tension
pulley

A/C
compressor
pulley

ENGINE <4G9-MPI> –

On-vehicle Service

ENGINE <4G9-MPI> –

On-vehicle Service

11B-8

<When measuring the deflection>

Apply approx. 100 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: 26

4 N·m

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

readjust if necessary.

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

IGNITION TIMING CHECK

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

Turn the ignition switch to LOCK (OFF) position, and then
connect the MUT-

to the diagnosis connector.

Set up a timing light.

Start the engine and run at idle.

Check that engine idle speed is within the standard value.

Standard value: approx. 700 r/min

Select No.17 of the MUT-

Actuator test.

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 MPI system while referring to GROUP 13C
– 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. 10

BTDC

NOTE
(1) Ignition timing is variable within about

, even under

normal operating.

(2) And it is automatically further advanced by about 5

from standard value at higher altitudes.

11. Remove the timing light.
12. Turn the ignition switch to LOCK (OFF) position, and then

remove the MUT-

MUT-

ENGINE <4G9-MPI> –

On-vehicle Service

ENGINE <4G9-MPI> –

On-vehicle Service

11B-9

IDLE SPEED CHECK

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

Turn the ignition switch to LOCK (OFF) position, and then
connect the MUT-

to the diagnosis connector.

Set up the timing light.

Check the ignition timing is within the standard value.

Standard value: approx. 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.

Curb idle speed: 700

100 r/min

NOTE
The idle speed is controlled automatically by the idle speed
control (ISC) system.

If the idle speed is outside the standard value, check the
MPI components by referring to GROUP 13C –
Troubleshooting.

Remove the timing light.

Turn the ignition switch to the LOCK (OFF) position, and
then remove the MUT-

IDLE MIXTURE CHECK

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

Turn the ignition switch to LOCK (OFF) position, and then
connect the MUT-

to the diagnosis connector.

Set up the timing light.

Check that the ignition timing is within the standard value.

Standard value: approx. 5

BTDC

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

Set the CO, HC tester.

Check the CO contents and the HC contents at idle.

Standard value

CO contents: 0.1 % or less
HC contents: 100 ppm or less

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

Diagnosis output

Closed-loop control (When the closed-loop control is
normal, the output signal of the oxygen sensor changes
between 0 – 400 mV and 600 – 1,000 mV at idle.)

Fuel pressure

Injector

Ignition coil, spark plug cable, spark plug

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.

Remove the timing light.

10. Turn the ignition switch to the LOCK (OFF) position, and

then remove the MUT-

MUT-

ENGINE <4G9-MPI> –

On-vehicle Service

11B-10

COMPRESSION PRESSURE CHECK

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

Disconnect the ignition coil and spark plug cables.

Remove all of the 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 250 r/min):

1370 kPa

Limit (at engine speed of 250 r/min): min. 1039 kPa

Measure the compression pressure for all the cylinders,
and check that the pressure differences of the cylinders
are below the limit.
Limit: max. 100 kPa

If there is a cylinder with compression or a compression
difference that is outside the limit, pour a small amount
of engine oil through the spark plug hole, and repeat the
operations in steps from (6) to (8).

(1) If the compression increases after oil is added, the

cause of the malfunction is a worn or damaged piston
ring and/or cylinder inner surface.

(2) If the compression does not rise after oil is added,

the cause is a burnt or defective valve seat, or pressure
is leaking from the gasket.

10. Connect the crank angle sensor connector.
11. Install the spark plugs.
12. Install the ignition coils and spark plug cables.
13. Use the MUT-

to erase the diagnosis codes.

NOTE
This will erase the diagnosis code resulting from the crank
angle sensor connector being disconnected.

Crank angle sensor connector

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