Diagnostic Procedure
WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.
Perform the malfunction diagnosis according to the troubleshooting procedure for the multiplex communication system. (See FOREWORD [PCM (SKYACTIV-G 2.0, SKYACTIV-G 2.5)] .)