Mitsubishi Galant. Manual — part 22

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <2.4L>

11A-7

•

Diagnosis output

•

Timing belt cover and crankshaft position sensor installation
conditions

•

Crankshaft sensing blade condition

CAUTION

If the actuator test is not canceled, the forced drive will
continue for 27 minutes. Driving in this state could lead to
engine failure.
9. Press the clear key on scan tool MB991502 (select forced

drive stop mode), and cancel the actuator test.

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

Standard value: Approximately 10

°°°°

BTDC

NOTE: Ignition timing fluctuates about

±

7

°

Before Top Dead

Center, even under normal operating condition.

NOTE: It is automatically further advanced by about 5

°

to

10

°

Before Top Dead Center at higher altitudes.

IDLE MIXTURE CHECK

M1111002100095

Required Special Tool:
MB991502: Scan Tool (MUT-II)
1. Before inspection, set vehicles in the following condition:

•

Engine coolant temperature: 80

−

95

°

C

(176

- 203

°

F)

•

Lights and all accessories: OFF

•

Transaxle: "P" range

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.

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

value.

Standard value: 5

°°°°

BTDC

±±±±

3

°°°°

4. Start the engine and increase the engine speed to 2,500 r/

min for 2 minutes.

5. Set the CO, HC tester.

6. Check the CO contents and the HC contents at idle.

Standard value:

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

7. If the CO and HC contents do not remain inside the standard

value, check the following items:

NOTE: Replace the catalytic converter when the CO and HC
contents do not remain inside the standard value, even
though the result of the inspection is normal for all items.

•

Diagnosis output

•

Closed-loop control (When the closed-loop control is carried
out normally, the output signal of the heated oxygen sensor
changes between 0

−

400 mV and 600

−

1,000 mV at idle.)

•

Fuel pressures

AC003081 AB

16 PIN

MB991502

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <2.4L>

11A-8

•

Injector

•

Ignition coil, spark plug cable, spark plug

•

EGR system and EGR valve leak

•

Evaporative emission control system

•

Compression pressure

CURB IDLE SPEED CHECK

M1111003500104

Required Special Tool:
MB991502: Scan Tool (MUT-II)
1. Before inspection and adjustment set vehicles in the

following condition.

•

Engine coolant temperature: 80

−

95

°

C

(176

- 203

°

F)

•

Lights and all accessories: OFF

•

Transaxle: "P" range

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before
connecting or disconnecting scan tool MB991502.
2. Connect scan tool MB991502 to the data link connector.

3. Check the basic ignition timing.

Standard value: 5

°°°°

BTDC

±±±±

3

°°°°

4. Start the engine.

5. Run the engine at idle for 2 minutes.

6. Check the idle speed. Select item number 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
air control system.

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

GROUP 13A, Diagnosis

−

Symptom Chart

P.13A-22

.

COMPRESSION PRESSURE CHECK

M1111002600089

1. Before inspection, check that the engine oil, starter and

battery are normal. Also, set the vehicle in the following
condition:

•

Engine coolant temperature: 80

−

95

°

C

(176

- 203

°

F)

•

Lights, and all accessories: OFF

•

Transaxle: "P" range

2. Disconnect the spark plug cables.

3. Remove all of the spark plugs.

4. Disconnect the crankshaft position sensor connector.

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

AC003081 AB

16 PIN

MB991502

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <2.4L>

11A-9

WARNING

Keep your distance from the spark plug hole when
cranking. Oil, fuel, etc., may spray out from the spark
plug hole and may cause serious injury.

5. Cover the spark plug hole with a shop towel etc., during

cranking. After the engine has been cranked, check for
foreign material 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

−−−−

400 r/min):

1,275 kPa (185 psi)

Minimum limit (at engine speed of 250

−−−−

400 r/min):

959 kPa (139 psi)

8. Measure the compression pressure for all the cylinders, and

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

Limit: 98 kPa (14 psi)

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 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 crankshaft position sensor connector.

11.Install the spark plugs and spark plug cables.

12.Use the scan tool to erase the diagnostic trouble codes.

NOTE: This will erase the diagnostic trouble code resulting
from the crankshaft position sensor connector being
disconnected.

MANIFOLD VACUUM CHECK

M1111002700097

1. Before inspection, set vehicles in the following condition:

•

Engine coolant temperature: 80

−

95

°

C (176 - 203

°

F

)

•

Lights and all accessories: OFF

•

Transmission: P range

2. Connect a tachometer.

AKX01178

COMPRESSION
GAUGE

AB

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <2.4L>

11A-10

3. Attach a Tee-fitting union to the vacuum hose between the

fuel pressure regulator and the intake manifold plenum, and
connect a vacuum gauge.

4. Start the engine and check that idle speed is within

specification. Then check the vacuum gauge reading.

Idle speed:700

±±±±

100 r/min

Minimum limit: 60 kPa (18 in Hg)

LASH ADJUSTER CHECK

M1111002900109

If an abnormal noise (chattering noise) suspected to be caused
by malfunction of the lash adjuster is produced immediately
after starting the engine and does not disappear, perform the
following check.

NOTE: An abnormal noise due to malfunction of the lash
adjuster is produced immediately after starting the engine and
changes with the engine speed, irrespective of the engine load.
If, the abnormal noise is not produced immediately after
starting the engine or does not change with the engine speed,
or it changes with the engine load, the lash adjuster is not the
cause for the abnormal noise.

NOTE: When the lash adjuster is malfunctioning, the abnormal
noise is rarely eliminated by continuing the warming-up of the
engine at idle speed.
However, the abnormal noise may disappear only when seizure
is caused by oil sludge in the engine whose oil is not
maintained properly.
1. Start the engine.

2. Check if the abnormal noise produced immediately after

starting the engine, changes with the change in the engine
speed.
If the abnormal noise is not produced immediately after
starting the engine or it does not change with the engine
speed, the lash adjuster is not the cause for the noise.
Therefore, investigate other causes. The abnormal noise is
probably caused by some other parts than the engine proper
if it does not change with the engine speed. (In this case, the
lash adjuster is in good condition.)

3. With the engine idling, change the engine load (shift from N

to D range, for example) to make sure that there is no
change in the level of abnormal noise.
If there is a change in the level of abnormal noise, suspect a
tapping noise due to worn crankshaft bearing or connecting
rod bearing. (In this case, the lash adjuster is in good
condition.)

4. After completion of warm-up, run the engine at idle to check

for abnormal noise.

AKX01179

VACUUM GAUGE

AB