NHTSA ID Number: 10191534
Manufacturer Communication Number: 01-002-21-3767a
TSB/Document Date: 2021-05-04
Summary
Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the engine rpm. The tapping noise may be caused by the switchable hydraulic lash adjuster (HLA), which may not work properly due to air bubbles accumulated in the oil passage in it. To eliminate this concern, the switchable HLA has been modified for increased oil supply to reduce air bubbles in the oil passage. NOTE: The switchable HLA can be pressed down with a finger if air bubbles have accumulated in it.
BULLETIN NOTES
This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red.
Previously issued TSBs:
01-002/21
01-006/20
Date issued:
01/14/21
11/04/20, 07/06/20 and 04/23/20
APPLICABLE MODEL(S)/VINS
2019-2021 Mazda3 (US spec non-turbo)
2018-2021 Mazda6 (US spec non-turbo)
2018-2021 CX-5 (US spec non-turbo)
2020-2021 CX-30 (US spec non-turbo)
DESCRIPTION
Some vehicle may exhibit a tapping noise from the engine during idling; etc., and synchronized to the engine rpm. The
tapping noise may be caused by the switchable hydraulic lash adjuster (HLA), which may not work properly due to air
bubbles accumulated in the oil passage in it. To eliminate this concern, the switchable HLA has been modified for
increased oil supply to reduce air bubbles in the oil passage.
NOTE: The switchable HLA can be pressed down with a finger if air bubbles have accumulated in it.
Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE
1. Verify customer concern.
NOTE: If the vehicle returns with the same issue after TSB is performed, contact Hotline.
2. Using a listening device or stethoscope, start the engine and listen to each cylinder's intake and exhaust side to
determine the location of the tapping noise.
3. Remove the cylinder head cover and check each switchable HLA of the cylinder that makes the tapping noise to see if
it can be pressed down with a finger like the attached video clip (to confirm if the noise is caused at the switchable HLA).
• If it can be compressed even a little, it should be replaced.
• If the noise is caused at other parts, this TSB is not applicable. Diagnose and repair according to the instructions
on MGSS.
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05/03/2021 10:27 AM tlawrenc
4. Replace the switchable HLA with a modified one according to the instructions on MGSS.
• Mazda3 (HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [WITH CYLINDER
DEACTIVATION])
• Mazda6 (HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [WITH CYLINDER
DEACTIVATION])
• CX-5 (HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION])
• CX-30 (HYDRAULIC LASH ADJUSTER (HLA) REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION])
Videos
• SHLA Installation
• SHLA Installation - Correct vs Incorrect
• Rocker Arm Inspection during HLA Replacement
5. Perform following steps to eliminate the air bubbles.
a. With the vehicle parked, keep the engine rpm at 2000 rpm for 5 minutes.
NOTE: Engine rpm will fall to idle normally due to the failsafe function.
b. Again, keep the engine rpm at 2000 rpm for 5 minutes.
NOTE:
• DO NOT skip this step even if the noise is gone.
• Engine rpm will fall to idle normally due to the failsafe function.
c. Confirm the noise is gone.
NOTE: If the noise still exists, contact Hotline.
6. Verify repair.
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05/03/2021 10:27 AM tlawrenc
PARTS INFORMATION
Parts Number
Description
Qty.
Notes
PYFA-12-1A0A
Adjuster, Hydraulic Lash Switch
1-8
PYFA-10-235
Gasket, Head Cover
1
[R]
PE01-12-257
Ring, "O"
1
[R] for electric variable valve timing motor/driver
PE01-10-673
Ring, "O"
1
[R] [Japan built vehicles] for vacuum pump
P54G-10-673
Ring, "O"
1
[R] [Mexico built vehicles] for vacuum pump
PE01-13-555
Rubber, Seal
1
[R] [Japan built vehicles] for fuel pump
PEAR-13-555
Rubber, Seal
1
[R] [Mexico built vehicles] for fuel pump
PE01-20-ZF1
Ring, "O"
1
[R] for fuel pump
PYMM-13-290A
Pipe, Fuel
1
[R] for fuel pump
PYFA-10-193
Gasket, RR.Housing
1
[R] for rear housing
9YA02-0678
1
[R] for front cover
9YA02-0865
1
[R] for front cover
[R] Replacement Parts
Replacement parts location
• Gasket for cylinder head cover
• O-ring for electric variable valve timing motor/driver
• O ring for vacuum pump
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05/03/2021 10:27 AM tlawrenc
• Gaskets and pipe for high pressure fuel pump
• Blind plugs (upper and lower) on the engine front cover service holes
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05/03/2021 10:27 AM tlawrenc
WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Mazda
’s Powertrain Limited Warranty term.
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type
A
Symptom Code
80
Damage Code
99
Part Number Main Cause
Quantity
Operation Number / Labor Hours:
PYFA-12-1A0A
1-8
XXT12XRX /
3.4 Hrs. (Mazda3, Mazda6, CX-30)
3.5 Hrs. (CX-5)
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05/03/2021 10:27 AM tlawrenc
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TSB/Document ID: 01-002-21-3767a
Replacement Service Bulletin Number:
MFR Communication Date: 2021-04-30
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ENGINE AND ENGINE COOLING
MFR Component System:
MFR Component Subsystem:
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