Mazda RX-8 Manual page 225

Main Relay Operation Inspection
1. Verify that the main relay clicks when the ignition switch is turned to the ON position and off.
If there is no operation sound, inspect the following:
•
Main relay (See RELAY INSPECTION .)
Wiring harness and connector between battery and main relay terminal A.
Wiring harness and connector between PCM terminal 5AC, 5AF and main relay terminal
C.
Wiring harness and connector between PCM terminal 4E and main relay terminal E.
Wiring harness and connector between PCM terminal 4Q and engine fuse.
Notes:
(w) RX8-Engine Troubleshooting
Page 176