July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

GND Circuit Inspection

Turn the ignition switch to LOCK.
Disconnect the PCM connectors.
Inspect for continuity between the PCM GND terminals and body GND using an ohmmeter.
- If not as specified, repair the related harnesses for open circuit.
Fig 1: Identifying PCM Ground Terminals
Courtesy of MAZDA MOTORS CORP.