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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
auto-tensioner.
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2.Remove the drive belt.
(Refer to ).
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![](../../../img/11/AC301703AA00ENG.png)
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3.Securely insert the
spindle handle or ratchet handle with a 12.7 mm insertion
angle into
the jig hole of the auto tensioner. Turn the auto-tensioner
to the left and right to check and
see that there is no threading. 4.If there are any
problems in the procedure 1 or 3, replace the
auto-tensioner. (Refer
to ). 5.Install
the drive belt. (Refer to ).
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You can verify if the
auto-tensioner is defective or not by checking the drive
belt tension.
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1.Check the drive belt
tension. (Refer to ).
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![](../../../img/11/AC507219AB00ENG.png)
![](../../../img/11/AC301266AE00ENG.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)
Press the numeral key of "1" and check that "No. 1" appears
on the upper left of the
display.
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note |
This operation is
to temporarily set the preset data
such as the belt specifications,
because if the measurement is taken
without input of the belt
specifications, conversion to
tension value (N) cannot be made,
resulting in judgement of
error.
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(4)
Press "Hz" button twice to change the display to the
frequency display (Hz). (5)
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caution |
- The temperature of the
surface of the belt should
be as close to normal
temperature as
possible.
- 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) with your finger as shown in the illustration, and
check that the vibration frequency
of the belt is within the standard
value. Standard value: 109 - 145
Hz
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note |
To take the
measurement repeatedly, fillip the
belt again.
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(8)
Press and hold the "POWER" button to turn off the power
supply. 3.If not within the standard value,
replace the auto-tensioner. (Refer to ).
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1.Check the drive belt
tension. (Refer to ).
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![](../../../img/11/AC310824AB00ENG.png)
![](../../../img/11/AC301266AB00ENG.png)
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2.Measure the drive belt
tension vibration frequency by the following
procedures: (1)
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caution |
To prevent damage
to special tool V.C.I. (MB991824),
always turn the ignition switch to
the "LOCK" (OFF) position before
connecting or disconnecting special
tool V.C.I. (MB991824).
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Connect special tool belt tension meter set
(MB991668) to special tool V.C.I. (MB991824). (2)
Connect special tool M.U.T.-III main harness A (MB991910) to
special tool V.C.I. (MB991824). (3)
Connect special tool M.U.T.-III main harness A (MB991910) to
the diagnosis connector. (4)
Turn the ignition switch to "ON" position, and select
"Belt Tension" on the menu screen. (5)
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caution |
- The temperature of the
surface of the belt should
be as close to normal
temperature as
possible.
- 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 belt tension meter set (MB991668)
to the middle of the drive belt between
the pulleys (at the place indicated by arrow), approximately
10 - 20 mm away from the
rear surface of the belt so that it is perpendicular to the
belt (within an angle of ± 15 degree). (6)
Gently tap the middle of the belt between the pulleys (the
place indicated by the
arrow) with your finger as shown in the illustration, and
measure that the vibration frequency of
the belt is within the standard value. Standard
value: 109 - 145 Hz 3.If not within
the standard value, replace the auto-tensioner. (Refer to ).
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1.Check the drive belt
tension. (Refer to ).
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![](../../../img/11/AC301267AB00ENG.png)
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2.Use a belt tension gauge
in the middle of the belt between the pulleys (at the place
indicated
by the arrow) to measure that the belt tension is within the
standard value. Standard value: 331 - 577
N 3.If not within the standard value,
replace the auto-tensioner. (Refer to ).
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