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Fuel Pump Control Circuit [09/2022 - ]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. PERFORM ACTIVE TEST USING TECHSTREAM (ACTIVATE THE CIRCUIT 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 / Active Test / Activate the Circuit Relay.

      Powertrain > Engine > Active Test 

      Tester Display
      Activate the Circuit Relay
    5. According to the display on the Techstream, perform the Active Test and check that fuel pump operating sounds can be heard.

      OK

      Operating sounds can be heard from the fuel pump.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  3

    Result: 

    OK 

    See step  2

  2. READ VALUE USING TECHSTREAM (ENGINE SPEED) 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG).
    3. Turn the Techstream on.
    4. Put the engine in Inspection Mode (Maintenance Mode).

      Refer to INSPECTION MODE PROCEDURE [06/2018 - ]

      Powertrain > Hybrid Control > Utility 

      Tester Display
      Inspection Mode
    5. Enter the following menus: Powertrain / Engine / Data List / Engine Speed.

      Powertrain > Engine > Data List 

      Tester Display
      Engine Speed
    6. Read the values displayed on the Techstream while the engine is cranking.

      OK

      Values are displayed continuously.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE 

    Refer to PROBLEM SYMPTOMS TABLE [09/2022 - ]

    Result: 

    NG 

    CHECK CRANKSHAFT POSITION SENSOR CIRCUIT 

    Refer to DIAGNOSTIC TROUBLE CODE CHART [09/2022 - 09/2024] , or refer to DIAGNOSTIC TROUBLE CODE CHART [09/2024 - ]

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

      Refer to PROCEDURE - Step 1

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE RELAY (C/OPN RELAY) 

    Result: 

    OK 

    See step  4

  4. CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY) 
    1. Remove the C/OPN relay from the No. 2 relay block assembly.
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      1 (C/OPN relay) - Body ground Power switch on (IG) 11 to 14 V
      3 (C/OPN relay) - Body ground Power switch on (IG) 11 to 14 V

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM) 
    1. Remove the C/OPN relay from the No. 2 relay 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) - A46-29 (FC) Always Below 1 Ω
      2 (C/OPN relay) or A46-29 (FC) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP) 
    1. Remove the C/OPN relay from the No. 2 relay block assembly.
    2. Disconnect the fuel pump 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) - O46-4 (B) Always Below 1 Ω
      5 (C/OPN relay) or O46-4 (B) - Body ground and other terminals Always 10 kΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. 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
      O46-5 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

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

      w/ Canister Pump Module: Refer to INSPECTION [01/2019 - ]

      w/o Canister Pump Module: Refer to INSPECTION [01/2019 - ]

      HINT: 

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

      Refer to INITIALIZATION [09/2022 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE ECM 

    Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - ]

    Result: 

    NG 

    REPLACE FUEL PUMP 

    w/ Canister Pump Module: Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - ]

    w/o Canister Pump Module: Refer to REMOVAL [09/2022 - 11/2022] , or refer to REMOVAL [11/2022 - ]

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (IGP-MAIN) - 1 (C/OPN relay) Always Below 1 Ω
      3 (IGP-MAIN) or 1 (C/OPN relay) - Body ground and other terminals Always 10 kΩ or higher

      HINT: 

      If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  10

  10. CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - C/OPN RELAY) 
    1. Remove the EFI-MAIN NO. 1 relay from the No. 1 junction block and No. 1 relay block assembly.
    2. Remove the C/OPN relay from the No. 2 relay block assembly.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3 (EFI-MAIN NO. 1) - 3 (C/OPN relay) Always Below 1 Ω
      3 (EFI-MAIN NO. 1) or 3 (C/OPN relay) - Body ground and other terminals Always 10 kΩ or higher

      HINT: 

      If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    GO TO ECM POWER SOURCE CIRCUIT 

    Refer to ECM Power Source Circuit [09/2022 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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