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Mitsubishi Galant. Manual - part 55

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <3.0L>

11C-5

O N VEH IC LE SERVIC E

DRIVE BELT TENSION CHECK AND
ADJUSTMENT

M1111003100128

Refer to GROUP 00, Maintenance Service

−

Drive Belts

(Check Condition)

P.00-39

IGNITION TIMING CHECK

M1111001700102

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

•

Engine coolant temperature: 80

−

C (176 - 203

)

•

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. Set up a timing light.

4. Start the engine and run it at idle.

5. Check that the idle speed is approximately 700 r/min.

6. Select scan tool MB991502 actuator test "item number 17."

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

Standard value: 5

°°°°

BTDC

±±±±

°°°°

8. If the basic ignition timing is not within the standard value,

check the following items:

MD998051
Cylinder head bolt
wrench

MD998051-01 or General
service tool

Cylinder head bolt
loosening and tightening

MD998767
Tensioner pulley socket
wrench

MD998752-01

Timing belt tension
adjustment

MD998769
Crankshaft sprocket
spacer

General service tool

Used if the crankshaft
needs to be rotated to
attach the timing belt, etc.

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

D998051

D998767

D998769

AC003081 AB

16 PIN

MB991502

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <3.0L>

11C-6

•

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 15

°°°°

BTDC

NOTE: Ignition timing fluctuates about

Before Top Dead

Center, even under normal operating condition.

NOTE: It is automatically further advanced by about 5

Before Top Dead Center at higher altitudes.

IDLE MIXTURE CHECK

M1111002100103

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

•

Engine coolant temperature: 80

−

C (176 - 203

)

•

Lights and all accessories: OFF

•

Transaxle: "P" range

CAUTION

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

value.

Standard value: 5

°°°°

BTDC

±±±±

°°°°

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 <3.0L>

11C-7

•

Injector

•

Ignition coil, spark plug cable, spark plug

•

EGR system and EGR valve leak

•

Evaporative emission control system

•

Compression pressure

CURB IDLE SPEED CHECK

M1111003500115

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

following condition.

•

Engine coolant temperature: 80

−

C (176 - 203

)

•

Lights and all accessories: OFF

•

Transaxle: "P" range

CAUTION

3. Check the basic ignition timing.

Standard value: 5

°°°°

BTDC

±±±±

°°°°

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 13B, Diagnosis

−

Symptom Chart

P.13B-22

COMPRESSION PRESSURE CHECK

M1111002600090

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

−

C (176 - 203

)

•

Lights, and all accessories: OFF

•

Transaxle: "P" range

2. Disconnect the spark plug cables.

3. Remove all of the spark plugs.

AC003081 AB

16 PIN

MB991502

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL <3.0L>

11C-8

4. Disconnect the crankshaft position sensor connector.

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

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):824 kPa (119 psi)

Minimum limit (at engine speed of 250

−−−−

400 r/min):575

kPa (83 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 distributor connector being disconnected.

MANIFOLD VACUUM CHECK

M1111002700105

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

•

Engine coolant temperature: 80

−

C (176 - 203

)

•

Lights and all accessories: OFF

•

Transmission: "P" range

2. Connect a tachometer.

AKX01198

CRANKSHAFT POSITION
SENSOR CONNECTOR

AKX01199

COMPRESSION
GAUGE

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