Mazda TSB #01-001-21-3761

2018 Mazda MAZDA6

TSB Document:

Affected Component: ENGINE AND ENGINE COOLING

Summary
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 in 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 to force the learning of the closed position of the EGR valve when a misfire is detected at idle

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Date Published
JAN 14, 2021
NHTSA TSB #
10186694
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