Mitsubishi Montero (2002-2004). Manual — part 825
ON VEHICLE SERVICE
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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)
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
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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
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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
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
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