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01006 13 .pdf


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Service Bulletin

Mazda North American Operations
Irvine, CA 92618-2922

© 2013 Mazda Motor of America, Inc.

Subject:

Bulletin No:

01-006/13

Last Issued:

02/13/2013

UNUSUAL ENGINE NOISE AFTER A COLD ENGINE START

2013-2014 CX-5, 2014 MAZDA6 - UNUSUAL ENGINE NOISE AFTER A COLD ENGINE

APPLICABLE MODEL(S)/VINS
2013-2014 CX-5
2014 Mazda6

DESCRIPTION
Some customers may complain about an unusual noise coming from the engine compartment for about 20 seconds after a cold engine start. This noise is a normal engine operation for improved exhaust gas emissions. The
noise does not indicate a malfunction.

ACCELERATED WARM-UP SYSTEM (AWS)
The SKYACTIV-G engine is equipped with 4-2-1 exhaust manifold to improve the fuel economy and engine
power. The distance from the engine to the catalytic converter is longer than previous engines such as the LF
engine. This longer distance does not allow the catalytic converter to warm up quickly. To off-set this condition,
AWS has been developed by burning fuel inside the exhaust manifold for 20 seconds to quickly warm up the
catalytic converter. The customer may identify the burning sound as an unusual noise.

Long Exhaust Pipes (4-2-1 Type)

SKYACTIV-G

Short Exhaust Pipes

LF Engine

Page 1 of 2
CONSUMER NOTICE: The information and instructions in this bulletin are intended for use by skilled technicians. Mazda technicians utilize the proper tools/
equipment and take training to correctly and safely maintain Mazda vehicles. These instructions should not be performed by “do-it-yourselfers.” Customers
should not assume this bulletin applies to their vehicle or that their vehicle will develop the described concern. To determine if the information applies,
customers should contact their nearest authorized Mazda dealership. Mazda North American Operations reserves the right to alter the specifications and
contents of this bulletin without obligation or advance notice. All rights reserved. No part of this bulletin may be reproduced in any form or by any means,
electronic or mechanical---including photocopying and recording and the use of any kind of information storage and retrieval system ---without permission in
writing.

Bulletin No: 01-006/13

Last Issued: 02/13/2013

© 2013 Mazda Motor of America, Inc.

AWS OPERATION
a. Engine coolant temperature of 50F - 113F (10C - 45C) at engine start.
b. At idle (accelerator pedal off) with transmission in P, N, or D.

AWS CONTROL
a. Ignition timing is retarded 20 degrees.
b. Engine speed is increased.
AWS burns fuel inside the exhaust manifold
(A) to quickly warm up the catalytic convertor. The customer may identify the burning
sound as an unusual noise.

AWS CANCELATION
AWS is canceled when the vehicle is driven.

AWS IDENTIFICATION
a. Customer states the noise is about 20 seconds after a cold engine start.
b. There is no leakage from the exhaust system.

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