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Fuel Pump Control Circuit [02/2014 - 11/2016]: Procedure

WARNING: This page is about a different car, the 2016 Toyota Highlander, 2015 Toyota Highlander, and 2014 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (CONTROL THE FUEL PUMP / SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch to on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

      Powertrain > Engine and ECT > Active Test 

      Tester Display
      Control the Fuel Pump / Speed
    5. Check whether fuel pump operating sounds can be heard while operating the fuel pump using the Techstream.

      OK

      Operating sounds can be heard from the fuel pump.

      Result

      Proceed to
      OK
      NG

    Result:  1

    NG 

    See step  5

    Result:  2

    OK 

    See step  2

  2. INSPECT RELAY (FUEL PMP RELAY) 
    1. Inspect the FUEL PMP relay.

      Refer to PROCEDURE - Step 2

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE RELAY (FUEL PMP RELAY) 

    Result:  1

    OK 

    See step  3

  3. INSPECT FUEL PUMP RESISTOR 
    1. Inspect the fuel pump resistor.

      Refer to INSPECTION [02/2014 - 11/2016]

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE FUEL PUMP RESISTOR. Refer to  REMOVAL [02/2014 - 11/2016] 

    Result:  1

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - FUEL PUMP RESISTOR) 
    1. Remove the FUEL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the fuel pump resistor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (FUEL PMP relay terminal) - A14-1 Always Below 1 Ω
      4 (FUEL PMP relay terminal) - A14-2 Always Below 1 Ω
      5 (FUEL PMP relay terminal) or A14-1 - Body ground Always 10 kΩ or higher
      4 (FUEL PMP relay terminal) or A14-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to  PROBLEM SYMPTOMS TABLE [02/2014 - 11/2016] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  5. PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.

      Powertrain > Engine and ECT > Active Test 

      Tester Display
      Control the Fuel Pump / Speed
    5. Check the operation of the relay while operating it using the Techstream.

      OK

      Operating noise can be heard from the C/OPN relay.

      Result

      Proceed to
      OK
      NG

    Result:  1

    NG 

    See step  11

    Result:  2

    OK 

    See step  6

  6. INSPECT FUEL PUMP 
    1. Inspect the fuel pump.

      Refer to INSPECTION [02/2014 - 11/2016]

      HINT: 

      Perform "Inspection After Repair" after replacing the fuel pump.

      Refer to INITIALIZATION [02/2014 - 11/2016]

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE FUEL PUMP. Refer to  REMOVAL [02/2014 - 11/2016] 

    Result:  1

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (FUEL PUMP - FUEL PMP RELAY) 
    1. Disconnect the fuel pump connector.
    2. Remove the FUEL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      c2-4 (B) - 4 (FUEL PMP relay terminal) Always Below 1 Ω
      c2-4 (B) or 4 (FUEL PMP relay terminal) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  8

  8. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PMP RELAY) 
    1. Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Remove the FUEL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (C/OPN relay terminal) - 2 (FUEL PMP relay terminal) Always Below 1 Ω
      3 (C/OPN relay terminal) - 3 (FUEL PMP relay terminal) Always Below 1 Ω
      3 (C/OPN relay terminal) or 2 (FUEL PMP relay terminal) - Body ground Always 10 kΩ or higher
      3 (C/OPN relay terminal) or 3 (FUEL PMP relay terminal) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  9

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      c2-5 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (FUEL PMP RELAY - FUEL PUMP RESISTOR) 
    1. Remove the FUEL PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the fuel pump resistor connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (FUEL PMP relay terminal) or A14-1 - Body ground Always 10 kΩ or higher
      4 (FUEL PMP relay terminal) or A14-2 - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE ECM. Refer to  REMOVAL [02/2014 - 11/2016] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

  11. INSPECT RELAY (C/OPN RELAY) 
    1. Inspect the C/OPN relay.

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE RELAY (C/OPN RELAY) 

    Result:  1

    OK 

    See step  12

  12. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - SEMICONDUCTOR PWR INTEGRATION ECU) 
    1. Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the semiconductor pwr integration ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      5 (C/OPN relay terminal) - 1G-8 Always Below 1 Ω
      1 (C/OPN relay terminal) - 1G-4 Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM) 
    1. Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 junction block assembly.
    2. Disconnect the ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (C/OPN relay terminal) - A43-8 (FC) Always Below 1 Ω
      2 (C/OPN relay terminal) or A43-8 (FC) - Body ground Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE SEMICONDUCTOR PWR INTEGRATION ECU. Refer to  REMOVAL [02/2014 - ] 

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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