01-001-21-3761a

BULLETIN NOTES
This bulletin supersedes the previously issued buletin(s) listed below: The changes are noted in Red.
Previous TSBs:
Date(s) Issued:
01-001/21
01/14/21
APPLICABLE MODEL(S)/VINS
2018 Mazda6 (US spec) with SKYACTIV-G 2.5T with VINS lower than JM1GL******336737 (produced before December
22, 2018)
2019 Mazda6 (Mexico spec) with SKYACTIV-G 2.5T with VINS lower than JM1GL******336562 (produced before
December 22, 2018)
2016-2021 CX-9 (US spec) with SKYACTIV-G 2.5T with VINS lower than JM3TC******519519 (produced before January
26, 2021)
2016-2021 CX-9 (Mexico spec) with SKYACTIV-G 2.5T with VINS lower than JM3TC******454021 (produced before
January 29, 2021)
DESCRIPTION
Some vehicles may exhibit an occasional rough idle accompanied with DTC P0300:00 (Random misfire) due to the
following:
1. While closing the EGR valve, carbon deposit etc. pinched at the valve seat prevents the valve from closing completely.
2. The closed position of the EGR valve is learned improperly as it is not equipped with a position sensor.
3. While idling, the EGR gas improperly mixes with fresh air through the EGR valve that is not closed properly.
4. Misfire occurs.
To eliminate this concern, the control software of the PCM has been modified (for service) to force the learning of the
closed position of the EGR valve when a misfire is detected at idle.
Customers having this concern should have their vehicle repaired using the following repair procedure.
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REPAIR PROCEDURE
1. Verify customer concern.
• If the concern continues even after cycling the engine off and on, check the EGR valve and clean the carbon
deposit if it prevents the valve from closing.
• If damage is found on the valve seat in the EGR valve, replace the EGR valve.
2. Reprogram the PCM with Mazda Modular Diagnostic System (M-MDS) using IDS 122.05 or later software. Refer to
IDS Reprogramming Procedure.
3. Verify the repair by starting the engine and making sure there is no rough idle, CHECK ENGINE light ON or abnormal
warning lights present.
NOTE: If any DTCs should remain after performing DTC erase, diagnose the DTCs according to the appropriate
troubleshooting on MGSS.
CALIBRATION
Model
Year
Drive
File Name
Mazda6
2018 (US)
2019 (Mexico)
-
PYH7-188K2-E
CX-9
2016-2017 (US and Mexico)
2WD
PYFL-188K2-R
4WD
PYFM-188K2-R
CX-9
2018 (US and Mexico)
2WD
PYD7-188K2-F
4WD
PYD8-188K2-F
CX-9
2019 (US)
2WD
PX23-188K2-D
4WD
PX24-188K2-D
CX-9
2020-2021 (US)
2WD
PXM3-188K2-D
4WD
PXM4-188K2-D
CX-9
2019 (Mexico)
2WD
PXB3-188K2-D
CX-9
2020-2021 (Mexico)
4WD
PXB4-188K2-D
2WD
PXM8-188K2-C
4WD
PXM9-188K2-C
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PARTS INFORMATION
Parts Number
Description
Qty.
Notes
PY8V-20-305
Gasket, EGR Valve
1
Only if EGR valve needs to be cleaned or replaced.
PY8V-20-300
Valve, EGR
1
Only if EGR valve needs to be replaced.
NOTE: No part is required for PCM reprogramming.
WARRANTY INFORMATION
NOTE:
• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair.
• This repair will be covered under Federal Emission Warranty.
• Additional diagnostic time cannot be claimed for this repair.
Warranty Type
A
Symptom Code
03
Damage Code
9W
Part Number Main Cause
5555-18-881
Quantity
Operation Number / Labor Hours:
0
XXS91AFX / 0.3 Hrs. (PCM reprogramming only)
XXS91BFX / 0.6 Hrs. (PCM reprogramming and
checking/cleaning EGR valve)
XXS91CFX / 0.6 Hrs. (PCM reprogramming and
checking/cleaning/replacing EGR valve)
NOTE: If the EGR valve is cleaned and/or replaced, claim the parts as related parts.
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