SA-061-20

Mazda North American Operations
Irvine, CA 92618-2922
Service Alert
Subject:
CHECK ENGINE LIGHT COMES ON WHEN DRIVING WITH P3400
STORED IN PCM
Service Alert No.: SA-061/20
Last Issued: 08/05/2020
BULLETIN NOTES
This Service Alert supersedes the previously issued Service Alert(s) listed below: The changes are noted in
Red.
Previous Service Alert(s): Date(s) Issued:
SA-015/19
05/20/19
and 04/08/19
APPLICABLE MODEL(S)/VINS
2018 Mazda6
2018-2019 CX-5
2019 Mazda3
DESCRIPTION
If you receive a customer concern about the CHECK IN light coming on and DTC P3400 (cylinder
deactivation system malfunction) stored, perform the inspection in the Repair Procedure.
REPAIR PROCEDURE
1. Remove the valve cover and inspect for any rocker arms that are broken or have fallen off, especially in
the cylinder deactivation area (cylinders 1 and 4). Refer to SA-041/18 if there is any issue with a rocker arm.
2. Remove the front and rear oil control valves for cylinder deactivation and inspect the oil control valves
and cylinder head port for contamination or debris (see photo).
Was contamination or debris found?

Yes:



Photograph your findings.
Collect service history including oil filter and part number.
Contact Hotline for instructions on how to attach the photos to the hotline case.
Page 1 of 3
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.
© 2020 Mazda North American Operations, U.S.A.
08/12/2020 10:15 AM tlawrenc
Service Alert No.: SA-061/20

Last Issued: 08/05/2020
No: If there is no sign of contamination or debris, proceed with a normal diagnosis for DTC P3400
according to the instructions on MGSS.
Page 2 of 3
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.
© 2020 Mazda North American Operations, U.S.A.
08/12/2020 10:15 AM tlawrenc
Service Alert No.: SA-061/20
Last Issued: 08/05/2020
Page 3 of 3
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.
© 2020 Mazda North American Operations, U.S.A.
08/12/2020 10:15 AM tlawrenc