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Home >> Toyota >> 2008 >> Sequoia SR5, 4.7 T, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2UZ-FE) - Component And System Testing, On-Vehicle Inspection, Removal, Inspection And Installation >> Fuel Pump Control Circuit >> Inspection Procedure

Inspection Procedure

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the PROBLEM SYMPTOMS TABLE .

  1. PERFORM ACTIVE TEST USING TECHSTREAM (FUEL PUMP) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch to ON.
    3. Turn the Techstream ON.
    4. Enter the following menus: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.
    5. Check whether operating sounds can be heard while operating the relay using the Techstream.

      OK: Operating sounds can be heard from relay. 

    NG:  Go to step  4

    OK: Go to Next Step. 

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      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 higher
      O35-2 (DI) or A27-18(DI) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to Next Step. 

    Fig 1: Identifying Fuel Pump ECM Connector Terminals
    G05645162Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT FUEL PUMP ECU (FPC SIGNAL) 
    1. Disconnect the fuel pump ECU connector.
    2. Crank the engine.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      O35-1 (FPC) - O35-3 (E) Engine cranking 2.8 V or higher

    NG: REPLACE ECM  (See REMOVAL  )

    OK: REPLACE FUEL PUMP ECU  (See REMOVAL )

    Fig 2: Identifying Fuel Pump ECU Connector Terminals
    G05645163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT CIRCUIT OPENING RELAY (C/OPN) 
    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 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      3-5 When battery voltage not applied 10 kΩ or higher
      3-5 When battery voltage applied to terminals 1 and 2 Below 1 Ω

    NG: REPLACE CIRCUIT OPENING RELAY (C/OPN) 

    OK: Go to Next Step. 

    Fig 3: Identifying Circuit Opening Relay (C/OPN)
    G05645164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT CIRCUIT OPENING RELAY (POWER SOURCE VOLTAGE) 
    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 

      RESISTANCE SPECIFICATION

      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
      Fig 4: Identifying Circuit Opening Relay (C/OPN)
      G05149753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  11

    OK: Go to Next Step. 

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 5: Identifying Circuit Opening Relay (C/OPN), ECM Connector And Fuel Pump ECU Connector Terminals
    G05645166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step. 

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      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

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 6: Identifying Fuel Pump And Fuel Pump ECU Connector
    G05645167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step. 

  8. INSPECT FUEL PUMP 
    1. Inspect the fuel pump (See INSPECTION ).

    NG: REPLACE FUEL PUMP  (See REMOVAL )

    OK: Go to Next Step. 

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

      Standard Resistance 

      RESISTANCE SPECIFICATION

      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 higher
      O35-2 (DI) or A27-18 (DI) - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 7: Identifying Fuel Pump ECU And ECM Connector Terminals
    G05645168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to Next Step. 

  10. INSPECT FUEL PUMP ECU (FPC SIGNAL) 
    1. Disconnect the fuel pump ECU connector.
    2. Crank the engine.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      O35-1 (FPC) - O35-3 (E) Engine cranking 2.8 V or higher

    NG: REPLACE ECM  (See REMOVAL  )

    Fig 8: Identifying Fuel Pump ECU Connector Terminals
    G05645163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: REPLACE FUEL PUMP ECU  (See REMOVAL )

  11. CHECK HARNESS AND CONNECTOR (CIRCUIT OPENING RELAY (C/OPN) - IGN FUSE AND INTEGRATION RELAY) 
    1. Remove the circuit opening relay (C/OPN) from the engine room relay block.
    2. Remove the IGN fuse from the engine room relay block.
    3. Remove the integration relay from the engine room relay block.
    4. Disconnect the 1B integration relay connector.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFICATION

      Tester Connection Condition Specified Condition
      C/OPN relay (2) - IGN fuse (2) Always Below 1 Ω
      C/OPN relay (5) - 1B-4 Always Below 1 Ω
      C/OPN relay (2) or IGN fuse (2) - Body ground Always 10 kΩ or higher
      C/OPN relay (5) or 1B-4 - Body ground Always 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Fig 9: Identifying Circuit Opening Relay (C/OPN) And IGN Fuse
    G05150192Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to ECM POWER SOURCE CIRCUIT 

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