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1.Turn off the engine from
the idle state then check to see that the drive belt is not
protruding from the pulley width of the drive belt
auto-tensioner.
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2.Remove the air intake hose
(Refer to GROUP 15 - Air Cleaner ).
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3.Remove the drive belt
(Refer to ).
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![](../../../img/11/ACE02644AB00ENG.png)
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4.Install the tool to the
drive belt auto-tensioner, and check that no binding is
present
by turning the drive belt auto-tensioner in the left and
right directions. 5.If there are any problems in
the procedure 1 or 4, replace the drive belt auto-tensioner
(Refer to GROUP 16 - Charging System, Alternator
Assembly ). 6.Install
the drive belt (Refer to ). 7.Install
the air intake hose (Refer to GROUP 15 - Air Cleaner
).
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The drive belt auto-tensioner can
be checked whether it is in good condition by checking
its tension.
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1.Check the drive belt
tension (Refer to ).
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![](../../../img/11/AC507219AB00ENG.png)
![](../../../img/11/ACE02205AB00ENG.png)
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2.Measure the drive belt
tension vibration frequency by the following
procedures: (1)
Connect special tool microphone assembly (MB992082) to
special tool belt tension meter
(MB992081) of special tool belt tension meter set
(MB992080). (2)
Press the "POWER" button to turn on the power supply. (3)
Check how the belt tension meter is set (Refer to GROUP 00
- Precautions
Before Service - Belt Tension Meter Set ). (4)
Press "Hz" button twice to change the display to the
frequency display (Hz). (5)
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caution |
- 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
correspond to actual
values.
- Do not take the measurement
while the vehicle’s
engine is running.
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Hold special tool MB992080 to the middle of the belt
between the pulleys (at the place
indicated by arrow) where it does not contact the belt
(approximately 10 - 15 mm away
from the rear surface of the belt) so that it is
perpendicular to the belt (within an angle
of ± 15 °). (6)
Press the "MEASURE" button. (7)
Gently tap the middle of the belt between the pulleys (the
place indicated by the
arrow A or B) with your finger as shown in the illustration,
and check that the vibration frequency
of the belt is within the standard
value.
Standard value
(Reference):
<A> 126
- 159 Hz <B> 143 -
181 Hz
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note |
To take the
measurement repeatedly, fillip the
belt again.
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3.If not within the standard value, replace
the drive belt auto-tensioner (Refer to
GROUP 16 - Charging System, Alternator Assembly ).
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1.Check the drive belt
tension (Refer to ).
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![](../../../img/11/ACE02206AB00ENG.png)
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2.Use a belt tension gauge
in the middle of the belt between the pulleys shown in the
figure
(at the place indicated by the arrow A or B) to check that
the belt tension is within the standard
value.
Standard value
(Reference):
3.If not within the standard value,
replace the drive belt auto-tensioner (Refer to
GROUP 16 - Charging System, Alternator Assembly ).
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