125000681 - S10 ENGINE WHILSTLING / SERVICES BELT NOISY

A high frequency noise is heard from the engine, whose intensity varies with the number of revs
Results of the tests
0PRELIMINARY CHECKSAll OKProblems metOperation
Check the condition of the auxiliary shaft drive belt and check that the tension is correct.See if the whistling stays constant as more electrical loads are conneced.Continue to Step 1Belt worn.Replace the belt Op.    Op. 1092G10 SINGLE ENGINE BELT R R
Tension incorrectAdjust belt tension
The whistling noise increases.Continue to Step 1
1ALTERNATOR CHECKAll OKProblems metOperation
1.9 JTD 16V2.0 JTS

Check that the alternator is working properly, in particular

  • Voltage regulator
  • The connections between the alternator and the battery
Continue to Step 2Defective voltage regulatorReplace the voltage regulator Op.    Op. 5530A22 ALTERNATOR VOLTAGE REGULATOR - R+R
Connections not correctRestore the connections
3.2 V6

Check that the alternator is working properly, in particular:

  • Voltage regulator
  • The connections between the alternator and the battery
Continue to Step 2Defective voltage regulatorReplace the voltage regulator Op.    Op. 5530A24 ALTERNATOR VOLTAGE REGULATOR - R R WITH ALTERNATOR REMOVED
Connections not correctRestore the connections
2CHECK AUXILIARY SHAFT BELTAll OKProblems metOperation
Check whether the whistling disappears when the belt is disconnected.
Do not let the engine run for long with the belt disconnected
Continue to Step 3The whistling disappears:Continue to Step 3
The whistling remains constantContinue to Step 4
3AIR CONDITIONER COMPRESSOR CHECKAll OKProblems metOperation
Check the air conditioner air conditioner compressor is working properly.Continue to Step 4Air conditioner compressor faultyRepair or replace the compressor Op.    Op. 5040A20 AIR CONDITIONER COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY
4CHECK BELT TENSIONAll OKProblems metOperation
Check the condition of the belt tension bearingsContinue to Step 5Fixed belt tensioner faultReplace the fixed belt tensioner Op.    Op. 1092G20 ENGINE COMPONENT SINGLE BELT FIXED TENSIONER - ONE - R + R
Mobile belt tensioner faultReplace the mobile belt tensioner Op.    Op. 1092G14 ENGINE COMPONENT SINGLE BELT MOBILE TENSIONER - R + R
5CHECK ON CORRECT OPERATIONAll OKProblems metOperation
Check that the fault is no longer presentEnd of diagnosis.