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Fiat 500 Factory Service Manual (2007-2024)22 · Fault diagnosis
22 · Diagnostics

Engine whilstling / services belt noisy

Make
Fiat
Model
500 Factory Service Manual
Year
2007–2024
Section
Noise / vibrations › Engine whilstling / services belt noisy
Fault diagnosisEngine whilstling / services belt noisy

ENGINE WHILSTLING / SERVICES BELT NOISY

1.2 8v, 1.3 Multijet, 1.4 16v

There is a high frequency noise coming from the engine whose intensity varies with the number of revs

Test results
0PRELIMINARY CHECKSAll OKProblems encounteredOperation

Check the condition of the auxiliary drive belt and make sure the tension is correct.

Check whether the noise remains constant when the electrical loads switched on increases

Move on to Step 1

1. Belt worn

2. Tension not correct

3. Noise increases

1. Replace belt

Op. 1092G10 SINGLE ENGINE BELT - R.R

2. Adjust the belt tension

3. Move on to Step 1

1ALTERNATOR CHECKAll OKProblems encounteredOperation

Check that the alternator is working properly, in particular:

  • Voltage regulator
  • Connections between alternator and battery
Move on to Step 2

1. Voltage regulator defective

2. Connections not correct

1. Replace the pressure regulator

Op. 5530A24

2. Restore the correct connections.

2AUXILIARY UNITS BELT CHECKAll OKProblems encounteredOperation

Check whether the noise disappears if the belt is disconnected

Do not let the engine run for long with the belt detached.

Move on to Step 3

1. The noise disappears.

2. The noise remains constant.

1. Move on to Step 3

2. Move on to Step 4

3AIR CONDITIONING COMPRESSOR CHECKAll OKProblems encounteredOperation
Check the operation of the air conditioning compressor.Move on to Step 4Air conditioning compressor faulty.

Repair or replace the compressor

Op. 5040A20 AIR CONDITIONING COMPRESSOR - R+R - INCLUDES FLUID LEVEL CHECK AND TOP UP IF NECESSARY

4BELT TENSIONER CHECKAll OKProblems encounteredOperation
Check the condition of the belt tensioner bearings.End of diagnosisMoving belt tensioner faulty.

Replace moving belt tensioner

Op. 1092G14 ENGINE COMPONENT SINGLE BELT MOVING TENSIONER - R + R

Parts & tools for this job For 2007 Fiat 500

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