After Repair Procedure

WARNING: This page is about a different car, the 2004 Mazda RX-8. However, it is still accessible from the selected car via links, so may be relevant.

Connect the WDS or equivalent to the DLC-2.
Cycle the ignition switch off, then to the ON position (Engine off).
Record DTC if retrieved.
Clear all diagnostic data using the WDS or equivalent.

Fig 1: Connecting WDS Or Equivalent To DLC-2 Connector
Courtesy of MAZDA MOTORS CORP.