ENGINE <4G9-GDI> ± On-vehicle Service
11A-6
ON-VEHICLE SERVICE
DRIVE BELT TENSION CHECK AND
ADJUSTMENT
ALTERNATOR DRIVE BELT TENSION CHECK
Check the drive belt tension in the following procedure.
Standard value:
Vibration frequency Hz 143 ± 185
Tension N 294 ± 490
Deflection (Reference value) mm 9.7 ± 12.9
<When using the MUT-II>
1. Connect the special tool (belt tension meter set) to the
MUT-II.
2. Connect the MUT-II to the diagnosis connector.
3. Turn the ignition switch to ON and select ªBelt Tension
Measurementº from the menu screen.
4. Hold the microphone to the middle of the drive belt between
the pulleys (at the place indicated by the arrow), about
10 ± 20 mm away from the rear surface of the belt and
so that it is perpendicular to the belt (within an angle of
± 15_).
5. 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.
Caution
(1) The temperature of the surface of the belt should
be as close as possible to normal temperature.
(2) Do not let any contaminants such as water or oil
get onto the microphone.
(3) 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.
(4) 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.
(5) Do not take the measurement while the vehicle's
engine is running.
MB991668
(Microphone)
Alternator pulley
Crankshaft pulley
15_
15_
10 ± 20 mm
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