Circuit Opening Relay

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 1989 Mazda MX-6, 1989 Mazda MPV, 1989 Mazda B2600i, 1989 Mazda B2200, and 1989 Mazda 626. 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. Circuit opening relay on B2600i and 323 is behind the driver's side kick panel. On MPV, relay is mounted on ECU. ECU is under protective cover on passenger side floor. On MX-6 and 626, relay is located on panel near clutch pedal.

FUEL PUMP RELAY CIRCUIT VOLTAGES

Terminal	Ignition "ON" Volts	Ignition "OFF" 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 making resistance tests. See Fig 1 .

Fig 1: Testing Fuel Pump Relay

Courtesy of MAZDA MOTORS CORP.