SA-047-21

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-061/20
09/10/2020 and 08/05/2020
SA-015/19
05/20/19 and 04/08/19
APPLICABLE MODEL(S)/VINS
2018-2021 Mazda6
2018-2021 CX-5
2019-2021 Mazda3
2020-2021 CX-30
2016-2021 CX-3
DESCRIPTION
If you receive a customer concern about the CHECK ENGINE light coming on and DTC P3400 (cylinder deactivation
system malfunction) stored, the cylinder deactivation oil control valve may be plugged with plastic debris from the oil filter
wrapper. The debris may enter the center of the oil filter when poking a hole in the filter wrapper during removal, and
then travel through the engine and plug the cylinder deactivation oil control valve.
REPAIR PROCEDURE
1. Verify customer concern.
2. Remove the front and rear cylinder deactivation oil control valves and inspect the oil control valves and cylinder head
port for contamination or debris (see photo).
Was contamination or debris found?
• YES: Inspect the oil passage for debris and clear the passage if debris is found. A vacuum device such as a
brake bleeder may be helpful in removing the debris.
If the OCV tip filter is damaged, replace the cylinder deactivation OCV.
• NO: Proceed with a normal diagnosis for DTC P3400 on MGSS.
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3. Verify repair.
WARRANTY INFORMATION
Warranty does not apply if condition is created from outside influence.
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