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DUPLICATE THE NOISE AND TEST DRIVE NBBT0024S02 If possible, drive the vehicle with the customer until the noise is duplicated. Note any additional information on I Drive the vehicle and attempt to duplicate the conditions the customer states exist when the noise occurs. I If it is difficult to duplicate the noise, drive the vehicle slowly on an undulating or rough road to stress the CHECK RELATED SERVICE BULLETINS NBBT0024S03 After verifying the customer concern or symptom, check ASIST for Technical Service Bulletins (TSBs) related LOCATE THE NOISE AND IDENTIFY THE ROOT CAUSE NBBT0024S04 1. Narrow down the noise to a general area. To help pinpoint the source of the noise, use a listening tool (Chassis Ear: J-39570, Engine Ear: J-39565 and mechanics stethoscope). 2. Narrow down the noise to a more specific area and identify the cause of the noise by: I removing the components in the area that you suspect the noise is coming from. I tapping or pushing/pulling the component that you suspect is causing the noise. I feeling for a vibration with your hand by touching the component(s) that you suspect is (are) causing the I placing a piece of paper between components that you suspect are causing the noise. I looking for loose components and contact marks. REPAIR THE CAUSE NBBT0024S05 I If the cause is a loose component, tighten the component securely. I If the cause is insufficient clearance between components: − separate components by repositioning or loosening and retightening the component, if possible. − insulate components with a suitable insulator such as urethane pads, foam blocks, felt cloth tape or ure- CAUTION: Do not use excessive force as many components are constructed of plastic and may be damaged. GI MA EM LC EC FE AT TF PD AX SU BR ST RS HA SC EL IDX SQUEAK AND RATTLE TROUBLE DIAGNOSES Work Flow (Cont’d) BT-5 |