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Home >> Mazda >> 1992 >> 929 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure (Fuel Injection) >> Fuel Pump Circuit (Except Navajo)
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Fuel Pump Circuit (Except Navajo)

  1. Turn ignition on. On B2200 (PFI), B2600i, MPV, MX-6 and 626, connect terminals of Yellow fuel pump check connector with a jumper wire. See FUEL PUMP CHECK CONNECTOR (YELLOW) LOCATIONS  table. On Miata, MX-3, Protege, 323 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 and 929, ECU grounds circuit opening relay and operates fuel pump whenever distributor signals are present. On other models, airflow meter grounds circuit opening relay and operates fuel pump whenever airflow is present.
  3. If circuit opening relay does not work, see SYSTEM/COMPONENT TESTS or appropriate TESTS W/CODES article.
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