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Fuel Pump Control Circuit [08/2017 - 08/2018]: Procedure

WARNING: This page is about a different car, the 2018 Toyota Sequoia, 2017 Toyota Sequoia, and 2016 Toyota Sequoia. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON and turn the Techstream ON.
    3. Enter the following menus: 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 Techstream.

      OK

      Operating sounds can be heard from relay.

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  2

  2. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (Refer to INSPECTION [08/2015 - 08/2018] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NG 

    REPLACE FUEL PUMP 

    (Refer to REMOVAL [10/2016 - 08/2018] )

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU) 
    1. Disconnect the Q1 fuel pump connector.
    2. Disconnect the O36 fuel pump ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      Q1-4 (B2) - O36-1 (FP) Always Below 1 Ω
      Q1-5 (E2) - O36-2 (FP-) Always Below 1 Ω
      Q1-4 (B2) or O36-1 (FP) - Body ground Always 10 kΩ or higher
      Q1-5 (E2) or O36-2 (FP-) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM AND BODY GROUND) 
    1. Disconnect the O35 fuel pump ECU connector.
    2. Disconnect the A27 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      O35-1 (FPC) - A27-52 (FPC) Always Below 1 Ω
      O35-2 (DI) - A27-18 (DI) Always Below 1 Ω
      O35-3 (E) - Body ground Always Below 1 Ω
      O35-1 (FPC) or A27-52 (FPC) - Body ground Always 10 kΩ or more
      O35-2 (DI) or A27-18 (DI) - Body ground Always 10 kΩ or more

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. REPLACE FUEL PUMP ECU 
    1. Replace the fuel pump ECU (Refer to REMOVAL [08/2015 - 08/2018] ).

    Result: 

    NEXT 

    See step  6

  6. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Check the fuel pump operation.

      OK

      Malfunction has been repaired successfully.

    Result: 

    OK 

    END 

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

  7. INSPECT CIRCUIT OPENING RELAY (C/OPN) 
    GTY543873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      3 - 5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    Result: 

    NG 

    REPLACE CIRCUIT OPENING RELAY (C/OPN) 

    Result: 

    OK 

    See step  8

  8. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE) 
    GTY554846Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage

      Tester Connection Switch Condition Specified Condition
      C/OPN relay (2) - Body ground Ignition switch ON 11 to 14 V
      C/OPN relay (5) - Body ground Ignition switch ON 11 to 14 V

    Result: 

    NG 

    See step  15

    Result: 

    OK 

    See step  9

  9. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - ECM AND FUEL PUMP ECU) 
    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
    2. Disconnect the A27 ECM connector.
    3. Disconnect the O35 fuel pump ECU connector.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      C/OPN relay (1) - A27-48 (FC) Always Below 1 Ω
      C/OPN relay (3) - O35-4 (+B) Always Below 1 Ω
      C/OPN relay (1) or A27-48 (FC) - Body ground Always 10 kΩ or higher
      C/OPN relay (3) or O35-4 (+B) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PUMP ECU) 
    1. Disconnect the Q1 fuel pump connector.
    2. Disconnect the O36 fuel pump ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      Q1-4 (B2) - O36-1 (FP) Always Below 1 Ω
      Q1-5 (E2) - O36-2 (FP-) Always Below 1 Ω
      Q1-4 (B2) or O36-1 (FP) - Body ground Always 10 kΩ or higher
      Q1-5 (E2) or O36-2 (FP-) - Body ground Always 10 kΩ or higher

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  11

  11. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (Refer to INSPECTION [08/2015 - 08/2018] ).

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump (Refer to INITIALIZATION [08/2017 - 08/2018] ).

    Result: 

    NG 

    REPLACE FUEL PUMP 

    (Refer to REMOVAL [10/2016 - 08/2018] )

    Result: 

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (FUEL PUMP ECU - ECM AND BODY GROUND) 
    1. Disconnect the O35 fuel pump ECU connector.
    2. Disconnect the A27 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      O35-1 (FPC) - A27-52 (FPC) Always Below 1 Ω
      O35-2 (DI) - A27-18 (DI) Always Below 1 Ω
      O35-3 (E) - Body ground Always Below 1 Ω
      O35-1 (FPC) or A27-52 (FPC) - Body ground Always 10 kΩ or more
      O35-2 (DI) or A27-18 (DI) - Body ground Always 10 kΩ or more

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  13

  13. REPLACE FUEL PUMP ECU 
    1. Replace the fuel pump ECU (Refer to REMOVAL [08/2015 - 08/2018] ).

    Result: 

    NEXT 

    See step  14

  14. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED 
    1. Check the fuel pump operation.

      OK

      Malfunction has been repaired successfully.

    Result: 

    OK 

    END 

    Result: 

    NG 

    REPLACE ECM 

    (Refer to REMOVAL [08/2015 - 08/2018] )

  15. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY - FUEL PUMP RELAY AND IGN FUSE) 
    GTY541032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
    2. Remove the fuel pump relay (F/PMP) from the engine room relay block.
    3. Remove the IGN fuse from the engine room relay block.
    4. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      C/OPN relay (2) - IGN fuse (2) Always Below 1 Ω
      C/OPN relay (5) - F/PMP relay (3) Always Below 1 Ω
      C/OPN relay (2) or IGN fuse (2) - Body ground Always 10 kΩ or more
      C/OPN relay (5) or F/PMP relay (3) - Body ground Always 10 kΩ or more

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. INSPECT FUEL PUMP RELAY (F/PMP) 
    GTY543873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the fuel pump relay (F/PMP) from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      3 - 5 When no battery voltage applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    Result: 

    NG 

    REPLACE FUEL PUMP RELAY (F/PMP) 

    Result: 

    OK 

    See step  17

  17. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY - INTEGRATION RELAY, BATTERY AND BODY GROUND) 
    1. Remove the F/PMP fuse from the engine room relay block.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F/PMP fuse Always Below 1 Ω
    3. Reinstall the F/PMP fuse.
    4. Remove the fuel pump relay (F/PMP) from the engine room relay block.
    5. Remove the integration relay from the engine room relay block.
    6. Disconnect the 1B integration relay connector.
    7. Disconnect the cable from the battery positive (+) terminal.
    8. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F/PMP relay (1) - 1B-4 Always Below 1 Ω
      F/PMP relay (5) - Positive (+) battery cable Always Below 1 Ω
      F/PMP relay (2) - Body ground Always Below 1 Ω
      F/PMP relay (1) or 1B-4 - Body ground Always 10 kΩ or higher
      F/PMP relay (5) or Positive (+) battery cable - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    GO TO ECM POWER SOURCE CIRCUIT 

    (Refer to ECM Power Source Circuit [08/2017 - 08/2018] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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