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Home >> Mazda >> 2002 >> B2300 Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> System Tests >> Fuel Pump Inspection
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Fuel Pump Inspection

  1. Check Fuel Pump For Operation

    Verify vehicle battery is fully charged. Verify fuel tank electrical connector is securely connected. With KOEO, connect scan tool to DLC. Select Active Command Mode. Select Output Test Mode. Press Mode to change to ALL ON mode. Press Start to run fuel pump. Listen to fuel pump to verify fuel pump operation. Turn ignition off. If fuel pump operates, see FUEL DELIVERY SYSTEM  under SYSTEM TESTS. If fuel pump does not operate, go to next step.

  2. Check Fuel Pump For Continuity

    Disconnect fuel tank assembly connector. Using a DVOM, check for continuity between fuel tank unit power circuit (Pink/Black wire) and ground circuit (Black wire). If continuity is present, go to next step. If continuity is not present, replace faulty fuel pump.

  3. Check Voltage At Fuel Pump Vehicle Harness Connected

    Connect scan tool to DLC. With KOEO, select Active Command Moded. Select Output Test Mode. Press Mode to change to ALL ON mode. Press Start to run fuel pump. Measure voltage at fuel tank assembly harness connector (Pink/Black wire). If voltage is more than 10.5 volts, go to next step. If voltage is 10.5 volts or less, check fuel pump relay and fuel pump shutoff switch. Repair as necessary.

  4. Check Fuel Pump Ground Circuit

    Disconnect fuel tank assembly harness connector. Measure resistance between fuel pump ground circuit (Black wire) and chassis ground of fuel tank assembly harness connector. If resistance is less than one ohm, ground circuit is okay. Recheck fuel pump. If resistance is one ohm or more, repair open circuit between harness connector and chassis ground.
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