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Home >> Mazda >> 1993 >> MX-3 Base, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure (Fuel Injection) >> Fuel Pump Circuit (Except Navajo)

Fuel Pump Circuit (Except Navajo)

  1. Turn ignition on. On B2200 (PFI), B2600i and MPV connect terminals of Yellow fuel pump check connector with a jumper wire. See FUEL PUMP CHECK CONNECTOR (YELLOW) LOCATIONS table. On Miata, MX-3, MX-6, Protege, RX7, 323, 626 and 929, attach jumper wire to test connector terminal Fp and to ground in the diagnostic connector, next to battery.
  2. Listen for fuel pump operating sound. If there is no sound, check main fuse, circuit operating relay, fuel pump and all electrical connections. On MX-3, MX-6, RX-7, 626 and 929, PCM grounds circuit opening relay and operates fuel pump whenever distributor or crank angle sensor signals are present. On other models, airflow meter grounds circuit opening relay whenever airflow is present.
  3. If circuit opening relay does not work, see SYSTEM & COMPONENT TESTING article or appropriate TESTS W/CODES article.
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