LEMON Manuals: Even more car manuals for everyone
Home >> Toyota >> 2004 >> Tacoma S-Runner >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> SFI System (5VZ-FE) >> Fuel Pump >> On-Vehicle Inspection

On-Vehicle Inspection

  1. CHECK FUEL PUMP OPERATION 
    1. Connect a TOYOTA hand-held tester to the DLC3.
      2. Fig 1: Connecting Toyota Hand-Held Tester To DLC3
      G04241290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON and push TOYOTA hand-held tester main switch ON.
      NOTE: Do not start the engine.
    3. Select the ACTIVE TEST mode on the TOYOTA hand-held tester.
    4. Please refer to the TOYOTA hand-held tester operator's manual for further details.
    5. If you have no TOYOTA hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See step  4).
    6. Check that there is pressure in the fuel inlet hose from the fuel filter.
      Fig 2: Checking Pressure In Fuel Inlet Hose
      G04241291Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      If there is fuel pressure, you will hear the sound of fuel flowing. If there is no pressure, check the M-fuse, fuses, EFI main relay, fuel pump, ECM and wiring connections.

    7. Turn the ignition switch OFF.
    8. Disconnect the TOYOTA hand-held tester from the DLC3.
  2. CHECK FUEL PRESSURE 
    1. Check the battery positive voltage is above 12 V.
    2. Disconnect the negative (-) terminal cable from the battery.
    3. Remove the 6 bolts, and disconnect the No.2 timing belt cover.
    4. Remove the union bolt holding the fuel pipe to the delivery pipe and gasket.
      Fig 3: Removing Union Bolt
      G04241292Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      CAUTION:
      • Put a shop towel under the delivery pipe. 
      • Slowly loosen the union bolt. 
    5. Install SST (pressure gauge) to the delivery pipe with the 2 gaskets and SST (union and union bolt).

      SST 09268-45014

      Fig 4: Installing SST (Pressure Gauge) To Delivery Pipe
      G04241293Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Torque: 34.3 N.m (350 kgf.cm, 25 ft.lbf) 

    6. Wipe off any splattered gasoline.
    7. Connect a TOYOTA hand-held tester to the DLC3 (See step  1).
    8. Reconnect the negative (-) terminal cable to the battery.
    9. Turn the ignition switch ON.
    10. Measure the fuel pressure.

      Fuel pressure: 

      265 - 304 kPa (2.7 - 3.1 kgf/cm 2  , 38 - 44 psi) 

      If pressure is high, replace the fuel pressure regulator.

      If pressure is low, check the fuel hoses, fuel hose connections, fuel pump, fuel filter and fuel pressure regulator.

    11. Disconnect the TOYOTA hand-held tester from the DLC3.
    12. Reinstall the No.2 timing belt cover with the 6 bolts.

      Torque: 9 N.m (90 kgf.cm, 80 in.lbf) 

    13. Start the engine.
    14. Disconnect the vacuum sensing hose from the fuel pressure regulator, and plug the hose end.
    15. Measure the fuel pressure at idle.
      Fig 5: Measuring Fuel Pressure At Idle
      G04241294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Fuel pressure: 

      265 - 304 kPa (2.7 - 3.1 kgf/cm 2  , 38 - 44 psi) 

    16. Reconnect the vacuum sensing hose to the fuel pressure regulator.
    17. Measure the fuel pressure at idle.

      Fuel pressure: 

      226 - 265 kPa (2.3 - 2.7 kgf/cm 2  , 33 - 38 psi) 

      If pressure is not as specified, check the vacuum sensing hose and fuel pressure regulator.

    18. Stop the engine.
    19. Check that the fuel pressure remains as specified for 5 minutes after the engine has stopped.

      Fuel pressure: 147 kPa (1.5 kgf/cm 2  , 21 psi) or more 

      If pressure is not as specified, check the fuel pump, pressure regulator and/or injectors.

    20. After checking fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.

      SST 09268-45014

    21. Remove the other union bolt, 3 gaskets and fuel pipe from the delivery pipes.
    22. Reinstall the fuel pipe with 4 new gaskets and the 2 union bolts.

      Torque: 34.3 N.m (350 kgf.cm, 25 ft.lbf) 

    23. Reconnect the negative (-) terminal cable to the battery.
    24. Check for fuel leaks (See PRECAUTION  ).
  3. INSPECT FUEL PUMP RESISTANCE 
    1. Pull up the LH rear seat cushion.
    2. Remove the floor service hole cover with the 3 screws.
    3. Disconnect the fuel pump connector.
    4. Using an ohmmeter, measure the resistance between terminals 4 and 5.

      Resistance: 0.2 - 0.3 Ω at 20°C (68°F) 

      If the resistance is not specified, replace the fuel pump and/or set plate.

    Fig 6: Measuring Resistance Between Terminals 4 And 5
    G04241295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT FUEL PUMP OPERATION 
    1. Connect the positive (+) lead from the battery to terminal 4 of the connector, and the negative (-) lead to terminal 5. Check that the fuel pump operations.
      Fig 7: Inspecting Fuel Pump Operation
      G04241296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:
      • These tests must be done quickly (within 10 seconds) to prevent the coil from burning out. 
      • Keep the fuel pump as far away from the battery as possible. 
      • Always do switching at the battery side. 

      If operation is as not specified, replace the fuel pump and/or set plate.

    2. Connect the fuel pump connector.
    3. Install the floor service hole cover with the 3 screws.
    4. Connect the LH rear seat cushion.
scientia non olet · About LEMON Manuals