Mazda RX-8 Workshop Manual page 15

DTC troubleshooting flow (on–board diagnostic)
Diagnostic trouble codes (DTCs) are important hints for repairing malfunctions that are difficult to simulate. Perform the specific DTC
diagnostic inspection to quickly and accurately diagnose the malfunction.
The on–board diagnostic function is used during inspection. When a DTC is shown specifying the cause of a malfunction, continue the
diagnostic inspection according to the items indicated by the on–board diagnostic function.
Diagnostic index