Mitsubishi Lancer (4A9 engine). Manual — part 24

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-10

3. Press number key 1. Check to ensure that "No.

01" appears on the upper left of the display and
that the following numeric values are displayed for
individual items (M, W, and S):
M 000.9 g/m
W 010.0 mm/R
S 0100 mm
If numeric values have not been entered (new
tool), set them according to the belt specifications
as shown below. Once you set them, you do not
have to set them again. The settings remain
undeleted even after battery replacement.
NOTE: This operation is to temporarily set the
preset data such as the belt specifications,
because if the measurement is taken without input
of the belt specifications, conversion to tension
value (N) cannot be made, resulting in judgement
of error.
<Setting procedure>
(1) Press down the "MASS" button till the belt

mass select display appears.

(2) Press the "UP" or "DOWN" button to select "01

1.5GT 0.9" and press the "MEASURE" button
to decide it. Check to ensure that "M 000.9 g/
m" is displayed.

(3) Press the "WIDTH" button to change to the

belt width input display.

(4) Press number keys 0, 1, 0, and 0 sequentially,

and press the "SELECT" button to apply them.
Check to ensure that "W 010.0 mm/R"
appears on the display.

(5) Press the "SPAN" button to change to the

span length input display.

(6) Press number keys 0, 1, 0, and 0 sequentially,

and press the "SELECT" button to apply them.
Check to ensure that "S 0100 mm" appears on
the display.

4. Press "Hz" button twice to change the display to

the frequency display (Hz).

CAUTION

• Do not allow any contaminants such as water

or oil to get onto the microphone.

• If strong gusts of wind blow against the

microphone or if there are any loud sources
of noise nearby, the values measured by the
microphone may not correspond to actual
values.

• If the microphone is touching the belt while

the measurement is being made, the values
measured by the microphone may not corre-
spond to actual values.

• Do not take the measurement while the vehi-

cle's engine is running.

ACB01455AB

10 – 15 mm

15˚

15˚

Crankshaft pulley

Gentry tap
with your finger

MB992080

Power steering
oil pump pulley

5. Hold the special tool MB992080 to the middle of

the drive belt between the pulleys (at the place
indicated by arrow), approximately 10

− 15 mm

away from the rear surface of the drive belt so that
it is perpendicular to the drive belt (within an angle
of

± 15°).

6. Press the "MEASURE" button.
7. Gently tap the middle of the drive belt between the

pulleys (the place indicated by the arrow) with
your finger as shown in the illustration, and
measure that the vibration frequency of the drive
belt is within the standard value.

Standard value (Reference): 108

− 221 Hz

NOTE: To take the measurement repeatedly, fillip
the drive belt again.

8. After the completion of the measurement, press

and hold the "POWER" button to turn off the
power supply.

9. If not within the standard value, replace the power

steering oil pump drive belt (Refer to ).

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-11

<When the tension is measured>

CAUTION

• When measuring the tension, make sure that

the engine is cold.

• Measure the tension after turning the crank-

shaft clockwise one turn or more.

ACB01456AB

Crankshaft pulley

Power steering
oil pump pulley

Belt tension
gauge

1. Use a belt tension gauge in the middle of the

power steering oil pump drive belt between the
pulleys shown in the figure (at the place indicated
by the arrow) to check that the drive belt tension is
within the standard value.

Standard value (Reference): 169

− 720 N

2. If not within the standard value, replace the power

steering oil pump drive belt (Refer to ).

<When the deflection is measured>

CAUTION

• When measuring the deflection, make sure

that the engine is cold.

•

ACB01457AB

Crankshaft pulley

Power steering
oil pump pulley

Approximately
100N

Deflection

Measure the deflection after turning the
crankshaft clockwise one turn or more.

1. Apply approximately 100 N of force to the middle

of the power steering oil pump drive belt between
the pulleys (at the place indicated by the arrow)
and check that the amount of deflection is within
the standard value.

Standard value (Reference): 18.2 mm or less

2. If not within the standard value, replace the power

steering oil pump drive belt (Refer to ).

POWER STEERING OIL PUMP DRIVE
BELT CHECK <Euro4>

M1111005600011

1. Check the every part of power steering oil pump

drive belt for damage including cracks or
delamination in detail by a visual inspection or
touching.

2. If there is the damage, replace the power steering

oil drive belt with a new one (Refer to ).

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-12

IGNITION TIMING CHECK

M1111001702829

AC608435

MB991827

MB991824

MB991910

AB

Diagnosis connector

<LH drive vehicles>

AC700191

MB991827

MB991824

AB

Diagnosis connector

<RH drive vehicles>

MB991910

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

inspection condition.

2. Turn the ignition switch to the "LOCK" (OFF)

position and then connect the M.U.T.-III to the
diagnosis connector.

AK802816

3

2

1

No.1 Ignition coil

AB

Power supply line
(terminal No. 3)

Equipment side
connector

3. Set the timing light to the power supply line

(terminal No. 3) of the ignition coil No. 1.
NOTE: The power supply line is looped and also
longer than the other ones.

4. Start the engine and let it run at idle.
5. Select the item No. 2 on M.U.T.-III and measure

engine idle speed and check that it is
approximately 750 r/min.

6. Select No. 11 (actuator test function) of the

M.U.T.-III, and set the ignition timing to the basic
ignition timing.

7. Check that basic ignition timing is within the

standard value.

Standard value: 5

° BTDC ± 3°

8. If the basic ignition timing is outside the standard

value, inspect the MPI system (Refer to GROUP
13A

− Troubleshooting − Inspection Chart for

Trouble symptoms ).

CAUTION

If the test is not cancelled, a forced driving will
continue for 27 minutes. Driving under this con-
dition may damage the engine.
9. Cancel the actuator test function item No. 11,

Basic ignition timing set mode, on M.U.T.-III

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

Standard value: approximately 10

° BTDC

NOTE:

.

•

The ignition timing may fluctuate within

±

7

°

.

This is normal.

•

In higher altitude, the ignition timing is more
advanced than the standard value by approxi-
mately 5

°

.

•

Wait till approximately 1 minute passes after
the engine started, and check the ignition tim-
ing when the engine stabilized.

11.Remove the timing light.
12.Turn the ignition switch to the "LOCK" (OFF)

position and then disconnect the M.U.T.-III.

ON-VEHICLE SERVICE

ENGINE MECHANICAL <4A9>

11A-13

IDLE SPEED CHECK

M1111003502865

AC608435

MB991827

MB991824

MB991910

AB

Diagnosis connector

<LH drive vehicles>

AC700191

MB991827

MB991824

AB

Diagnosis connector

<RH drive vehicles>

MB991910

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

inspection condition.

2. Turn the ignition switch to "LOCK" (OFF) position.
3. Connect the M.U.T.-III to the diagnosis connector.

AK802816

3

2

1

No.1 Ignition coil

AB

Power supply line
(terminal No. 3)

Equipment side
connector

4. Set the timing light to the power supply line

(terminal No. 3) of the ignition coil No. 1.
NOTE: The power supply line is looped and also
longer than the other ones.

5. Start the engine and let it run at idle.
6. Check that ignition timing is at the standard value.

Standard value: approximately 10

° BTDC

NOTE:

.

•

The ignition timing may fluctuate within

±

7

°

. This

is normal.

•

In higher altitude, the ignition timing is more
advanced than the standard value by approxi-
mately 5

°

.

•

Wait till approximately 1 minute passes after the
engine started, and check the ignition timing
when the engine stabilized.

7. Check the idle speed.

Standard value: 750

± 100 r/min

NOTE:

.

•

The idle speed is controlled automatically by
the idle speed control system.

•

When using the M.U.T.-III, select item No. 2
and take a reading of the idle speed.

8. If the idle speed is outside the standard value,

inspect the MPI system (Refer to GROUP 13A

−

Troubleshooting

− Inspection Chart for Trouble

Symptoms ).

9. Remove the timing light.
10.Turn the ignition switch to "LOCK" (OFF) position

and then disconnect the M.U.T.-III.