2.21.7.10 Drive Belt Chirp Diagnosis 

Diagnostic Hints: The symptom may be due to wet drive belt or pulley and may be an 
intermittent fault. Drive belt may need to spray a small amount of water to reproduce customer 
reported fault. If the symptom reoccurs after spraying water, then clean the pulley. Loose or 
unreasonable installation of body components, suspension components or other vehicle parts can 
also cause the chirp sound. 

Fault Definition: The following conditions are the drive belt chirp sound symptoms 

z  A chirp jack noise can be heard once    the drive belt rotates a lap. 

z  Noise often happens on a rainy day or in a cold morning. 

1 

Verify the fault. Does the engine have chirp sound? 

 

2 

Dismantle the drive belt to confirm whether the giggle does not arise again? 

A.  Dismantle the drive belt. Refer to 2.13.8.3 Replacement of Drive Belt. 

B.  Run the engine, but no more than 30 s. 

Does the scream disappear? 

 

3 

Inspect whether the drive belt surface is normal? (do not have ball, crack, etc) 

Refer to 2.13.7.9 Drive Belt Inspection

 

 

4 

Inspect whether the drive belt pulley is installed correctly? (do not happen 
misalignment) 

 

5 

Inspect whether the drive pulley is normal? 

Inspect whether the pulley is bent, twisted and so on.

 

No 

Reinstall the drive pulley. If necessary, 
replace the drive belt. 

Yes 

No 

Refer to 2.6.8.3 Replacement of Drive Belt 
to replace the drive belt. 

Yes 

No 

Refer to 2.6.7.4 Engine Noise Diagnosis 

Yes 

Yes 

To Diagnostic Hints 

No 

959

 

6 

Inspect whether all fasteners associated with the drive belt are normal? 

 

7 

Replace the drive belt. Confirm the fault is fixed. 

No 

Tighten loose fasteners. 

Yes 

No 

Replace the failed pulley. 

Yes 

960

2.13.7.11 Drive Belt Scream Diagnostic 

Diagnostic Hints: Loose or unreasonable installation of body, suspension and other components 
may cause screams. If there is intermittent noise, inspect the attached components by changing the 
engine load. It is recommended to inspect whether the air-conditioning system is over filled, 
power steering hose is clamped, the power steering fluid is correct or whether the generator is 
faulty. 

Fault Definition: The following conditions are the drive belt screams symptoms 

z  Scream is caused by drive belt slippage. 

z  Noise appears when a big load added to the drive belt, such as air-conditioning system 

compressor starting, the running engine with the throttle quickly opening or drive belt 
skidding in a drive component. 

 

2 

Dismantle the drive belt. Confirm whether the scream disappears? 

A.  Dismantle the drive belt. Refer to 2.13.8.3 Replacement of Drive Belt. 

B.  Run the engine, but no more than 30 s. 

Does the scream disappear? 

 

3 

Inspect whether the bearings of all accessory drive belt pulleys are normal? 

Pulley bearings do not appear stuck, loose and so on. 

 

4 

Inspect whether drive belt tensioner device is working properly? 

Tensioner pulley bearing device does not appear stuck, loose. Tensioner device does not appear 
loose and other damages. 

 

1 

Verify the fault. Does the engine scream? 

No 

Replace the drive belt tensioner assembly. Refer to 
the 2.13.8.4 Replacement of Drive Belt Tensioner 

Yes 

No 

Replace the damaged pulley or bearing. 

Yes 

No 

Refer to 2.13.7.3 Engine Noise Diagnosis 

Yes 

No 

To Diagnostic Hints 

Yes 

961

5 

Inspect whether the correct drive belt is used? 

Refer to 2.13.7.4 “Drive Belt Inspection” to inspect for the extension of the drive belt.

 

 

6 

Inspect whether all fasteners associated with the drive belt are normal? 

 

7 

Inspect whether the drive pulley is normal? 

Inspect whether the pulley is bent, twisted and so on.

 

 

8 

To Diagnostic Hints 

No 

Replace the failed pulley. 

Yes 

No 

Tighten loose fasteners. 

Yes 

No 

Refer to 2.13.8.3 Replacement of Drive Belt to 
replace the drive belt. 

Yes 

962