Mitsubishi Montero (2002-2004). Manual - part 825

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-5

ON VEHICLE SERVICE

DRIVE BELT TENSION CHECK

M1111003100054

CAUTION

Perform the check after rotating the engine in the normal 
direction (one revolution or more).
1. Check that the indicator mark of the auto-tensioner is 

located between the marks shown as "A" on the tensioner 
bracket.

2. If the mark is located out of the space "A," replace the drive 

belt.

NOTE: Since the auto-tensioner is used, it is not necessary to 
adjust the tension of the belt
Refer to GROUP 00, Maintenance Service 

− Drive Belts 

(Check Condition) 

P.00-39

.

MD998718
Crankshaft rear oil seal 
installer

MD998718-01

Press-fitting the crankshaft 
rear oil seal

MD998767
Tension pulley socket 
wrench

MD998752-01

Timing belt tension 
adjustment

MD998769
Crankshaft pulley spacer

General service tool

Rotating the crankshaft 
when installing the timing 
belt

MD998772
Valve spring compressor

General service tool

Compressing valve spring

MD998774
Valve stem seal installer

MD998774-01

Valve stem seal installer

TOOL

TOOL NUMBER AND 
NAME

SUPERSESSION

APPLICATION

D998767

AC204024

ACX00751AB

INDICATOR MARK

A

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-6

AUTO-TENSIONER CHECK

M1111003000035

1. Run the engine at idling speed and then stop it to check 

whether the drive belt is centered on the auto-tensioner 
pulley.

2. Insert a1/2 inch breaker bar into the square hole on the drive 

belt auto tensioner, and rotate it clockwise until the tensioner 
touches the stopper.

3. Align hole B with hole A, and insert a 5.0 mm (0.20 inch) 

Allen wrench to hold the tensioner. Then loosen the drive 
belt, and then remove the drive belt auto tensioner.

4. Move the auto-tensioner right and left by using a 1/2 inch 

breaker bar or similar tool to verify that it moves smoothly.

5. If some abnormality is found during the above mentioned 

check (1) and (3), replace the auto-tensioner.

IGNITION TIMING CHECK

M1111001700306

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

• Transmission: P range

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing 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 750 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 ± 3°

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

check the following items:

• Diagnosis output

• Timing belt cover and crankshaft position sensor installation 

conditions

• Crankshaft sensing blade condition

ACX01424AB

HOLE A

HOLE B

SQUARE 

HOLE

CLOCKWISE

ALLEN WRENCH

ACX01539

16-PIN

MB991502

AC

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-7

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.

CURB IDLE SPEED CHECK

M1111003500416

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

• Transmission: P range

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing 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, Multiport Fuel Injection (MFI) Diagnosis 

− 

Symptom Chart 

P.13Ab-26

.

IDLE MIXTURE CHECK

M1111002100192

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

• Transmission: P range

ACX01539

16-PIN

MB991502

AC

ON VEHICLE SERVICE

TSB Revision

ENGINE MECHANICAL

11A-8

CAUTION

To prevent damage to scan tool MB991502, always turn the 
ignition switch to "LOCK" (OFF) position before connect-
ing 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

• Injector

• Ignition coil, spark plug cable, spark plug

• EGR system and EGR valve leak

• Evaporative emission system

• Compression pressure

COMPRESSION PRESSURE CHECK

M1111002600335

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

• Transmission: 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.

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.

ACX01539

16-PIN

MB991502

AC

AK200795 AB

CRANKSHAFT
POSITION
SENSOR
CONNECTOR