Lexus IS250 · Service Manual ENGINE

Noise Occurs from Generator while Engine is Running

Circuit diagnosis

INSPECTION PROCEDURE


1. CHECK LOOSENESS OF V-RIBBED BELT
  1. Check the tension of the belt by pushing it down with a finger.

    OK:
    The tension of the belt is enough.



NG
REPLACE V-RIBBED BELT TENSIONER ASSEMBLY
OK


2. CHECK V-RIBBED BELT FOR WEAR
  1. Check the V-ribbed belt for wear.

    OK:
    The V-ribbed belt is not worn.



NG
REPLACE V-RIBBED BELT
OK


3. CHECK CLUTCH PULLEY FOR WEAR
  1. Check the clutch pulley groove for wear or other defects.

    OK:
    The clutch pulley groove is not damaged.



NG
REPLACE CLUTCH PULLEY
OK


4. CHECK THAT NOISE WHILE CLUTCH PULLEY IS OPERATING
  1. Perform a driving test and check if noise occurs when decelerating.

    OK:
    Noise does not occur.



NG
REPLACE CLUTCH PULLEY
OK

REPLACE GENERATOR ASSEMBLY


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