Main Relay

WARNING: This page is about a different car, the 1995 Mazda RX-7. However, it is still accessible from the selected car via links, so may be relevant.

Ensure main relay clicks when ignition is turned on and off.
If no sound is heard, unplug relay. Apply 12 volts to terminal "A", and ground terminal "B". See Fig 1 .
Using ohmmeter, check continuity between terminals "C" and "D". Continuity should be present with 12 volts applied. Continuity should not exist with no voltage applied. Replace main relay as necessary.

Fig 1: Testing Main/Fuel Pump Relay

Courtesy of MAZDA MOTORS CORP.