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Inspection 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: Go to step  10

    NG: Go to next step 

  2. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE CIRCUIT OPENING RELAY) 
    1. Connect a Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Select the following menu items: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
    4. Check whether operating sounds can be heard while operating the relay using the tester.

      OK: Operating sounds can be heard from relay. 

    OK: Go to step   5

    NG: Go to next step 

  3. INSPECT CIRCUIT OPENING RELAY 
    1. Remove the circuit opening relay from the engine room relay block.
      Fig 1: Identifying A/F Sensor Heater Relay
      G04942983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      3 - 5 10 kΩ or higher
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the circuit opening relay.

    NG: REPLACE CIRCUIT OPENING RELAY 

    OK: Go to Next Step 

  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch ON.
      Fig 2: Identifying B3 And E47 ECM Connectors
      G05108928Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      FC (E47-10) - E1 (B3-1) 11 to 14 V

    OK: REPLACE ECM  (See REMOVAL  )

    NG: CHECK AND REPLACE HARNESS OR CONNECTOR (ECM - CIRCUIT OPENING RELAY - IGNITION SWITCH) 

  5. INSPECT ECM POWER SOURCE CIRCUIT 

    Inspect the ECM power source circuit (See ECM POWER SOURCE CIRCUIT  ).

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  6. INSPECT FUEL PUMP RELAY ASSEMBLY 
    1. Remove the fuel pump relay from the engine room relay block.
      2. Fig 3: Identifying Fuel Pump Relay
      G04829434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      3 - 4 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 4 10 kΩ or higher
      (when battery voltage applied to terminals 1 and 2)
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the fuel pump relay.

    NG: REPLACE FUEL PUMP RELAY ASSEMBLY 

    OK: Go to Next Step 

  7. INSPECT FUEL PUMP ASSEMBLY 
    1. Inspect the fuel pump resistance.
      1. Measure the resistance between terminals 4 and 5.

        Standard Resistance: 0.2 to 3.0 Ω. at 20°C (68°F) 

        Fig 4: Identifying Fuel Pump Connector Terminals
        G05108930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Inspect the 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 do the switching at the battery side.

    NG: REPLACE FUEL PUMP ASSEMBLY  (See REMOVAL )

    OK: Go to Next Step 

  8. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP RELAY, FUEL PUMP - Body ground) 
    1. Check the harness and connector between the fuel pump and fuel pump relay.
      1. Disconnect the L5 fuel pump connector.
      2. Remove the fuel pump relay from the engine room relay block.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump (L5-4) - Fuel pump relay (4) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump (L5-4) or Fuel pump relay (4) - Body ground 10 kΩ or higher
      4. Reconnect the fuel pump connector.
      5. Reinstall the fuel pump relay.
    2. Check the harness and connector between the fuel pump and body ground.
      1. Disconnect the fuel pump connector.
        2. Fig 5: Identifying Fuel Pump Relay And L5 Fuel Pump Connector
        G05577552Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump (L5-5) - Body ground Below 1 Ω
      3. Reconnect the fuel pump connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step 

  9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY) 
    1. Remove the circuit opening relay from the engine room relay block.
      2. Fig 6: Identifying Circuit Opening Relay And Fuel Pump Relay Connector
      G05577553Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the fuel pump relay from the engine room relay block.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for open) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      Circuit opening relay (3) - Fuel pump relay (3) Below 1 Ω

      Standard Resistance (Check for short) 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      Circuit opening relay (3) or Fuel pump relay (3) - Body ground 10 kΩ or higher
    4. Reinstall the circuit opening relay.
    5. Reinstall the fuel pump relay.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: CHECK AND REPAIR HARNESS OR CONNECTOR (EFI RELAY - CIRCUIT OPENING RELAY) 

  10. INSPECT FUEL PUMP RELAY ASSEMBLY 
    1. Remove the fuel pump relay from the engine room relay block.
      2. Fig 7: Identifying Fuel Pump Relay
      G04829434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

      Tester Connections Specified Conditions
      3 - 4 Below 1 Ω
      3 - 5 10 kΩ or higher
      3 - 4 10 kΩ or higher
      (when battery voltage applied to terminals 1 and 2)
      3 - 5 Below 1 Ω
      (when battery voltage applied to terminals 1 and 2)
    3. Reinstall the fuel pump relay.

    NG: REPLACE FUEL PUMP RELAY ASSEMBLY 

    OK: Go to Next Step 

  11. INSPECT FUEL PUMP RESISTOR (RESISTANCE) 
    1. Inspect the fuel pump resistor resistance.
      1. Measure the resistance.

        Standard Resistance: 0.941 to 0.999 Ω at 20°C (68°F) 

        Fig 8: Inspecting Fuel Pump Resistor Resistance
        G05108934Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE FUEL PUMP RESISTOR  (See REMOVAL )

    OK: Go to Next Step 

  12. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - FUEL PUMP RESISTOR - FUEL PUMP) 
    1. Check the harness and connector between the fuel pump relay and fuel pump resistor.
      1. Remove the fuel pump relay from the engine room relay block.
      2. Disconnect the A13 fuel pump resistor connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump relay (5) - Fuel pump resistor (A13-1) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump relay (5) or Fuel pump resistor (A13-1) - Body ground 10 kΩ or higher
      4. Reinstall the fuel pump relay.
      5. Reconnect the fuel pump resistor connector.
    2. Check the harness and connector between the fuel pump resistor and fuel pump.
      1. Disconnect the A13 fuel pump resistor connector.
        2. Fig 9: Identifying A13 Fuel Pump Resistor Connector And L5 Fuel Pump Connector
        G05577556Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Disconnect the L5 fuel pump connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance (Check for open) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump resistor (A13-2) - Fuel pump (L5-4) Below 1 Ω

        Standard Resistance (Check for short) 

        TESTER CONNECTIONS SPECIFIED CONDITIONS CHART

        Tester Connections Specified Conditions
        Fuel pump resistor (A13-2) or Fuel pump (L5-4) - Body ground 10 kΩ or higher
      4. Reconnect the fuel pump resistor connector.
      5. Reconnect the fuel pump connector.

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

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

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