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Home >> Mazda >> 1994 >> 929 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing >> Fuel System >> Fuel Pressure (Fuel Injection) >> Fuel Pump Circuit
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Fuel Pump Circuit

  1. Turn ignition on. 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. PCM grounds circuit opening relay and operates fuel pump whenever distributor or crank angle sensor signals are present.
  3. If circuit opening relay does not work, proceed to SYSTEM/COMPONENT TESTS article in the ENGINE PERFORMANCE section or TESTS W/CODES article in the ENGINE PERFORMANCE section.
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