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Fuel Pump Control Circuit: Procedure

  1. CHECK FUEL PUMP OPERATION 
    1. Check if there is pressure in the fuel inlet hose.

      HINT: 

      If there is fuel pressure, you will hear the sound of fuel flowing.

    OK → See step   12 

    NG: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the engine switch on (IG) and turn the Techstream on.
    3. Select the following menu items: Powertrain/Engine/Active Test/Control the Fuel Pump/Speed.
    4. Check the operation of the relay while operating it using the Techstream.

      OK

      Operating noise can be heard from the relay.

    OK → See step   8 

    NG: Go to next step 

  3. INSPECT ECM POWER SOURCE CIRCUIT 
    1. Check the ECM power source circuit. Refer ECM Power Source Circuit .

      Standard voltage

      9 to 14 V

    NG → REPAIR OR REPLACE POWER SOURCE CIRCUIT 

    OK: Go to next step 

  4. INSPECT FUSE (F/PMP FUSE) 
    1. Remove the F/PMP fuse from the engine room No. 2 relay block.
      Fig 1: Identifying F/PMP Fuse
      GTY104708Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance of the F/PMP fuse.

      Standard resistance

      Below 1 Ω

    NG → CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  5. INSPECT INTEGRATION NO. 1 RELAY (EFI NO. 2 RELAY) 
    1. Remove the integration relay from the engine room No. 2 junction block.
      Fig 2: Identifying Integration Relay
      GTY104695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      2B-4 - 2C-1 10 kΩ or higher
      2B-4 - 2C-1 Below 1 Ω
      (when battery voltage applied between terminals 2B-3 and 2B-2)

    NG → REPLACE INTEGRATION NO. 1 RELAY 

    OK: Go to next step 

  6. INSPECT INTEGRATION NO. 1 RELAY (C/OPN RELAY) 
    1. Remove the integration relay from the engine room No. 2 junction block.
      Fig 3: Identifying Integration Relay
      GTY104695Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      2B-6 - 2B-8 10 kΩ or higher
      2B-6 - 2B-8 Below 1 Ω
      (when battery voltage applied between terminals 2B-6 and 2B-7)

    NG → REPLACE INTEGRATION NO. 1 RELAY 

    OK: Go to next step 

  7. INSPECT ECM (FC VOLTAGE) 
    1. Turn the engine switch on (IG).
      Fig 4: Identifying A6 And E7 ECM Connectors
      GTY101606Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Specified Condition
      A6-14 (FC) - E7-7 (E1) 9 to 14 V

    OK → REPLACE ECM 

    NG → CHECK AND REPAIR HARNESS AND CONNECTOR (ECM - C/OPN RELAY) 

  8. INSPECT F/PMP RELAY 
    1. Remove the F/PMP relay from the engine room No. 2 relay block.
      Fig 5: Identifying Relay Test Terminals
      GTY104187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 4 10 kΩ or higher
      3 - 4 Below 1 Ω
      (when battery voltage applied between terminals 1 and 2)

    NG → REPLACE F/PMP RELAY 

    OK: Go to next step 

  9. INSPECT FUEL PUMP 
    1. Inspect fuel pump resistance.
      Fig 6: Identifying Fuel Pump Connector Terminals
      GTY104497Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Measure the resistance between terminals 4 and 5.

        Standard resistance

        0.2 to 3.0 Ω at 20°C (68°F)

    2. Inspect fuel pump operation.
      1. Apply battery voltage to both terminals. Check that the pump operates.
        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 turn the voltage on and off on the battery side, not the fuel pump side.

    NG → REPLACE FUEL PUMP 

    OK: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (FUEL PUMP - F/PMP RELAY) 
    1. Check the harness and the connectors between the fuel pump and the F/PMP relay.
      1. Disconnect the V11 fuel pump connector.
      2. Remove the F/PMP relay from the engine room No. 2 relay block.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open)

        Tester Connection Specified Condition
        Fuel pump (V11-4) - F/PMP relay (4) Below 1 Ω

        Standard resistance (Check for short)

        Tester Connection Specified Condition
        Fuel pump (V11-4) or F/PMP (4) - Body ground 10 kΩ or higher
    2. Check the harness and the connectors between the fuel pump and body ground.
      1. Disconnect the V11 fuel pump connector.
      2. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open)

        Tester Connection Specified Condition
        Fuel pump (V11-5) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - F/PMP RELAY) 
    1. Remove the integration relay from the engine room No. 2 junction block.
    2. Remove the F/PMP relay from the engine room No. 2 junction block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance (Check for open)

      Tester Connection Specified Condition
      Integration relay (2B-8) - F/PMP relay (1) Below 1 Ω
      Integration relay (2B-8) - F/PMP relay (3) Below 1 Ω

      Standard resistance (Check for short)

      Tester Connection Specified Condition
      Circuit opening relay (2B-8) or F/PMP relay (1) - Body ground 10 kΩ or higher
      Circuit opening relay (2B-8) or F/PMP relay (3) - Body ground 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPAIR OR REPLACE INTEGRATION NO. 1 RELAY 

  12. INSPECT F/PMP RELAY 
    1. Remove the F/PMP relay from the engine room No. 2 relay block.
      Fig 7: Identifying Relay Test Terminals
      GTY104187Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Specified Condition
      3 - 4 10 kΩ or higher
      3 - 4 Below 1 Ω
      (when battery voltage applied between terminals 1 and 2)

    NG → REPLACE F/PMP RELAY 

    OK: Go to next step 

  13. INSPECT FUEL PUMP RESISTOR 
    1. Measure the resistance of the fuel pump resistor.
      Fig 8: Inspecting Fuel Pump Resistor
      GTY104490Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard resistance

      0.30 to 0.34 Ω at 20°C (68°F)

    NG → REPLACE FUEL PUMP RESISTOR 

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - FUEL PUMP RESISTOR) 
    1. Check the harness and the connectors between the F/PMP relay and the fuel pump resistor.
      1. Remove the F/PMP relay from the engine room No. 2 relay block.
      2. Disconnect the A45 fuel pump resistor connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard resistance (Check for open)

        Tester Connection Specified Condition
        F/PMP relay (4) - Fuel pump resistor (A45-2) Below 1 Ω
        F/PMP relay (3) - Fuel pump resistor (A45-1) Below 1 Ω

        Standard resistance (Check for short)

        Tester Connection Specified Condition
        Fuel pump relay (4) or Fuel pump resistor (A45-2) - Body ground 10 kΩ or higher
        Fuel pump relay (3) or Fuel pump resistor (A45-1) - Body ground 10 kΩ or higher

    OK → PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

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