Mitsubishi Lancer Evolution IX. Manual — part 330

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-9

CAUTION

• The temperature of the surface of the belt

should be as close to normal temperature as
possible.

• 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.

AC102806AB

MB991668

15˚

15˚

Gentry tap with
your finger

Water pump
pulley

Power steering
oil pump pulley

10 – 20 mm

(5) Hold special tool belt tension meter set

(MB991668) to the middle of the drive belt
between the pulleys (at the place indicated by
arrow), approximately 10

− 20 mm away from

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

±

15 degree).

(6) Gently tap the middle of the 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
belt is within the standard value.

Standard value: 110

− 144 Hz

3. If not within the standard value, replace the

auto-tensioner. (Refer to

P.11A-36

).

When using a tension gauge

1. Check the drive belt tension. (Refer to

P.11A-7

).

AC102807AB

Belt tension gauge

Water pump
pulley

Power steering
oil pump pulley

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

between the pulleys (at the place indicated by the
arrow) to measure that the belt tension is within
the standard value.

Standard value: 245

− 412 N

3. If not within the standard value, replace the

auto-tensioner. (Refer to

P.11A-36

).

IGNITION TIMING CHECK

M1111001701332

AC304777

Steering shaft

AC

MB991502

16-Pin

AC211686

AB

MB991911

16-PIN

MB991827

MB991824

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-10

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.-II/III to the
diagnosis connector.

3. Connect a timing light.
4. Start the engine and let it run at idle.
5. Use the M.U.T.-II/III to measure engine idle speed

and check that it is within the standard value.

Standard value: 800

± 100 r/min

6. Select No. 17 of the M.U.T.-II/III Actuator test.
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

diagnosis code

P.13A-17

).

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. Press the M.U.T.-II/III clear key (Select a forced

driving cancel mode) to release the Actuator test.

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

Standard value: approximately 5

° 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

°

.

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

position and then remove the M.U.T.-II/III.

IDLE SPEED CHECK

M1111003501215

AC304777

Steering shaft

AC

MB991502

16-Pin

AC211686

AB

MB991911

16-PIN

MB991827

MB991824

1. Before inspection, set the vehicle to the

pre-inspection condition.

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

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

3. Connect a timing light.
4. Start the engine and let it run at idle.
5. Check that ignition timing is at the standard value.

Standard value: approximately 5

° BTDC

6. Check the idle speed.

Standard value: 800

± 100 r/min

NOTE:

.

•

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

•

When using the M.U.T.-II/III, select item No. 22
and take a reading of the idle speed.

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-11

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

inspect the MPI system (Refer to GROUP 13A

−

Troubleshooting

− Inspection chart for diagnosis

code

P.13A-17

).

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

position and then remove the M.U.T.-II/III.

IDLE MIXTURE CHECK

M1111002100471

AC304777

Steering shaft

AC

MB991502

16-Pin

AC211686

AB

MB991911

16-PIN

MB991827

MB991824

1. Before inspection, set the vehicle to the

pre-inspection condition.

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

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

3. Connect a timing light.
4. Start the engine and let it run at idle.
5. Check that ignition timing is at the standard value.

Standard value: approximately 5

° BTDC

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

7. Set the CO, HC tester.
8. Check the CO contents and the HC contents at

idle.

Standard value

CO contents: 0.5 % or less
HC contents: 100 ppm or less

9. If there is a deviation from the standard value,

check the following items:

• Diagnosis output

• Closed-loop control (when the closed-loop con-

trol 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

• 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.

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

position and then remove the M.U.T.-II/III.

COMPRESSION PRESSURE CHECK

M1111002601402

AK304215AB

Crank angle
sensor connector

AK304216

Compression gauge

AB

1. Before inspection, set the vehicle to the

pre-inspection condition.

ON-VEHICLE SERVICE

ENGINE MECHANICAL

11A-12

2. Disconnect the ignition coils and spark plug

cables.

3. Remove all of the spark plugs.
4. Disconnect the crank angle sensor connector.

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

CAUTION

• Keep away from the spark plug hole when

cranking.

• 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.

5. 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.

6. Set compression gauge to one of the spark plug

holes.

7. Crank the engine with the throttle valve fully open

and measure the compression pressure.

Standard value (at engine speed of 250

r/min):

1,000 kPa

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

Minimum 640 kPa

8. Measure the compression pressure for all the

cylinders, and check that the pressure differences
of the cylinders are below the limit.

Limit: Maximum 98 kPa

9. 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 dose 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 M.U.T.-II/III to erase the diagnosis codes.

NOTE: This will erase the diagnosis code result-
ing from the crank angle sensor connector being
disconnected.

MANIFOLD VACUUM CHECK

M1111002701034

AC304777

Steering shaft

AC

MB991502

16-Pin

AC211686

AB

MB991911

16-PIN

MB991827

MB991824

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.-II/III to the diagnosis

connector.

AK304217AB

Fuel pressure control
solenoid valve

Vacuum gauge