Circuit Opening Relay

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1990 Mazda RX-7, 1990 Mazda Protege, 1990 Mazda MX-6, 1990 Mazda MX-5 Miata, and 1990 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

With relay connected, ensure specified voltage is present at relay terminals. See FUEL PUMP RELAY CIRCUIT VOLTAGES table. For locations of circuit opening relay, see CIRCUIT OPENING RELAY LOCATIONS table.

CIRCUIT OPENING RELAY LOCATIONS

Application	Location
B2600i & 929	Behind Left Kick Panel
Miata	Under Dash, Left Of Steering Column
MPV	Mounted On ECU, Under Protective Cover On Passenger Side's Floor
MX-6 & 626	On Fuse Block
Protege & 323	On Passenger Side's Wall, Near ECU
RX7	On Bracket Behind Instrument Panel

FUEL PUMP RELAY CIRCUIT VOLTAGES

Terminal	Ignition ON Volts	Ignition START Volts	Idle Volts
Fp	0	12	12
Fc	12	0	0
B	12	12	12
STA	0	12	0
E1	0	0	0

If voltages are okay, remove relay from vehicle. Check relay operation using a 12-volt battery source and perform resistance tests. See Fig 1 .

Fig 1: Testing Fuel Pump Relay

Courtesy of MAZDA MOTORS CORP.