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Home >> Mitsubishi >> 2010 >> Lancer ES, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 42 (Engine Mechanical - Lancer Evolution) >> On-Vehicle Service >> Auto-TENSIONER Check >> Function Check >> When The Vibration Frequency Is Measured: Recommendation

When The Vibration Frequency Is Measured: Recommendation

WARNING: This page is about a different car, the 2012 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

Required Special Tools: 

  1. Check the tension of the drive belt. (Refer to DRIVE BELT TENSION CHECK  ).
  2. Check the tension of the drive belt in 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.
      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.
      Fig 1: Connecting Special Tool Microphone Assembly To Special Tool Belt Tension Meter
      G05374096Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
    4. Press "Hz" button twice to change the display to the frequency display (Hz).
      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.
    5. 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 (0.4 - 0.59 inch) away from the rear surface of the belt) so that it is perpendicular to the belt (within an angle of ± 15 degrees angle).
    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: 98 - 124 Hz 

      NOTE: To take the measurement repeatedly, tap the belt again.
    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 <<D>> AUTO-TENSIONER REMOVAL  ).
    Fig 2: Checking Drive Belt Tension Using Belt Tension Meter & Drive Belt Routing Diagram
    G05392356Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
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