E00513 .pdf


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Service Information
Category

3-1, Shinchi, Fuchu-cho, Aki-gun
Hiroshima 730-8670, Japan
TEL : 81(82)287-5323
FAX : 81(82)287-5220

Technical

N
Coverage

Ref. No.

Page

E005/13

1 of 2

Date Issued

Distributor only

Please inform your dealers

Please convey this information to your
Warranty Dept.
Parts Dept.

Director
Training Dept.

April 8, 2013
General Manager
Field Rep.

Applicable Model

Date Revised

Applicable Countries or Specifications

All Models with rack and pinion type steering gear

Worldwide

Subject: Steering Gear Noise and/or Vibration When Turning Steering Wheel
DESCRIPTION
When turning the steering wheel, some vehicles may exhibit an unusual noise from the steering
gear or vibration (like rattling, knocking, etc.) is felt on the steering wheel.
CAUSE
In order to ensure smooth operation of steering gear, it is designed that appropriate pre-load is
applied to the engagement point between the rack and pinion gear.
This design sometimes allow a backlash noise from the gears engagement point depending on
the conditions of the tire-to-road contact surface, vehicle speed and steering wheel operating
speed.
This backlash noise (vibration) is not related to any functional failures.
Steering System

Internal Structure
Steering
Pre-load
Spring
Adjust
Cover

This rattle noise is a
steering wheel operation
sound and not a quality
concern.

Rack Bar
Pinion Gear

E005/13
Page 2 of 2
MASS PRODUCTION CHANGE
No mass production change is planned.

ACTION TO BE TAKEN
When you encounter a customer complaint on this concern, explain the mechanism of this noise
to the customer and convince him or her that this is not a quality concern, but an operating
sound of steering gear.
Do NOT replace the steering gear with a new one as this will not be efficient to solve the
customer complaint.

Ryu Shimizugawa
Manager, Technical Information Gr.
Technical Service Dept.
Mazda Motor Corporation


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E00513.pdf - page 2/2

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