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Inspection Procedure

  1. CHECK FUEL PUMP OPERATION (SEE  ON-VEHICLE INSPECTION  ) 
    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.

    1. OK: Go to step   5 . 
    2. NG: Go to next step. 
  2. PERFORM ACTIVE TEST USING HAND-HELD TESTER (OPERATION OF CIRCUIT OPENING RELAY) 
    1. Connect the hand-held tester to the DLC3.
    2. Turn the ignition switch on (IG) and turn the tester on.
    3. Select the following menu items: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP/SPD.
    4. Check whether operating sounds can be heard while operating the relay using the tester.

      OK: Operating sounds can be heard from the relay. 

    1. OK: Go to step   5 . 
    2. NG: Go to next step. 
  3. INSPECT ENGINE ROOM JUNCTION BLOCK ASSY (CIRCUIT OPENING RELAY) 
    1. Remove the engine room junction block.
    2. Measure the circuit opening relay resistance.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      1D-5 - 1D-3 10 kΩ or higher
      1D-5 - 1D-3 Below 1 Ω (when battery voltage applied to terminals 1G-5 and 1H-9)
    3. Reinstall the engine room junction block.
      Fig 1: Identifying Engine Room
      G02976377Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE ENGINE ROOM JUNCTION BLOCK ASSY 
    2. OK: Go to next step. 
  4. INSPECT ECM (FC VOLTAGE) 
    1. Turn the ignition switch on (IG).
    2. Measure the voltage between the terminals of the A24 and B47 ECM connectors.
      Fig 2: Measuring Voltage Between Terminals Of A24 And B47 ECM Connectors
      G02976378Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connections Specified Conditions
      FC (A24-10) - E1 (B47-1) 9 to 14 V
    1. OK: REPLACE ECM (SEE  REPLACEMENT  ) 
    2. NG: CHECK AND REPAIR HARNESS AND CONNECTOR (ENGINE ROOM JUNCTION BLOCK - IGNITION SWITCH) 
  5. INSPECT ECM POWER SOURCE CIRCUIT (SEE  ECM POWER SOURCE CIRCUIT  ) 
    1. NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT 
    2. OK: Go to next step. 
  6. INSPECT FUEL PUMP ASSY 
    1. Inspect fuel pump resistance.
      1. Disconnect the L8 fuel pump connector.
      2. Measure the resistance between terminals 4 and 5.

        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 fuel pump operates.
        Fig 3: Identifying L8 Component Connector
        G02976379Courtesy 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 switch at the battery side.
    1. NG: REPLACE FUEL PUMP ASSY (SEE  REMOVAL & INSTALLATION AND DISASSEMBLY & REASSEMBLY  ) 
    2. OK: Go to next step. 
  7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - CIRCUIT OPENING RELAY, FUEL PUMP - BODY GROUND) 
    1. Check the harness and connector between the fuel pump and circuit opening relay.
      1. Disconnect the L8 fuel pump connector.
      2. Remove the engine room junction block.
      3. Measure the resistance between the terminals of the engine room junction block (circuit opening relay) and fuel pump connector.

        Standard (Check for open): 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connections Specified Conditions
        Fuel pump (L8-4) - Engine room junction block (circuit opening relay) (1D-3) Below 1 Ω
        Fig 4: Identifying L 8 Harness Connector
        G02976380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard (Check for short): 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connections Specified Conditions
        Fuel pump (L8-4) or Engine room junction block (circuit opening relay) (1D-3) - Body ground 10 kΩ or higher
      4. Reconnect the fuel pump connector.
      5. Reinstall the engine room junction block.
        Fig 5: Identifying Engine Room Junction Block
        G02976381Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the harness and connector between the fuel pump and body ground.
      1. Disconnect the fuel pump connector.
      2. Measure the resistance between the terminal of the fuel pump connector and body ground.

        Standard (Check for open): 

        TESTER CONNECTION SPECIFIED CONDITION

        Tester Connections Specified Conditions
        Fuel pump (L8-5) - Body ground Below 1 Ω
      3. Reconnect the fuel pump connector.
    1. NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 
    2. OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN ON PROBLEM SYMPTOMS TABLE (SEE  PROBLEM SYMPTOMS TABLE  ) 
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