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HOMESERVICE MANUALSTOYOTA2009SEQUOIA LIMITED, 5.7 Y, RWDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 28 (ENGINE CONTROL SYSTEM (2UZ-FE) - COMPONENT AND SYSTEM TESTING, ON-VEHICLE INSPECTION, REMOVAL, INSPECTION & INSTALLATION)RELAYON-VEHICLE INSPECTION
2009 Toyota Sequoia Limited, 5.7 Y, RWD

On-Vehicle Inspection

2009 Toyota Sequoia Limited, 5.7 Y, RWDSECTION On-Vehicle Inspection
WARNING: This page is about a different variant/trim than selected.
  1. INSPECT CIRCUIT OPENING RELAY (C/OPN) 
    1. Measure the resistance according to the value(s) in the table below.
      Fig 1: Inspecting Circuit Opening Relay (C/OPN)
      G05645298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

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

      If the result is not as specified, replace the circuit opening relay.

  2. INSPECT INTEGRATION RELAY (IG2) 
    1. Measure the resistance of the IG2 MAIN fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        IG2 MAIN fuse Always Below 1 Ω

        If the result is not as specified, replace the IG2 MAIN fuse.

    2. Measure the resistance of the ignition relay No. 2 (IG2) circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        1C-1 - 1B-8 Battery voltage is not applied to terminals 1B-6 and 1B-7 10 kΩ or higher
        Battery voltage is applied to terminals 1B-6 and 1B-7 Below 1 Ω

        If the result is not as specified, replace the integration relay.

        Fig 2: Identifying Integration Relay
        G06221479Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT INTEGRATION RELAY (EFI) 
    1. Measure the resistance of the EFI No. 1 fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        EFI No. 1 fuse Always Below 1 Ω

        If the result is not as specified, replace the EFI No. 1 fuse.

    2. Measure the resistance of the EFI MAIN relay circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        1C-1 - 1B-4 Battery voltage is not applied to terminals 1B-2 and 1B-3 10 kΩ or higher
        Battery voltage is applied to terminals 1B-2 and 1B-3 Below 1 Ω

        If the result is not as specified, replace the integration relay.

        Fig 3: Identifying Integration Relay
        G06221480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT INTEGRATION RELAY (A/F) 
    1. Measure the resistance of the A/F fuse.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        A/F fuse Always Below 1 Ω

        If the result is not as specified, replace the A/F fuse.

    2. Measure the resistance of the A/F sensor heater relay circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        RESISTANCE SPECIFIED CONDITION

        Tester Connection Condition Specified Condition
        1C-1 - 1A-4 Battery voltage is not applied to terminals 1A-2 and 1A-3 10 kΩ or higher
        Battery voltage is applied to terminals 1A-2 and 1A-3 Below 1 Ω

        If the result is not as specified, replace the integration relay.

        Fig 4: Identifying Terminals Of Integration Relay
        G05628302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT FUEL PUMP RELAY 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance 

      RESISTANCE SPECIFIED CONDITION

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

      If the result is not as specified, replace the fuel pump relay.

      Fig 5: Inspecting Fuel Pump Relay
      G05645298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.