2008 Lexus LX 570FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

  1. INSPECT CIRCUIT OPENING RELAY (C/OPN) 
    1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    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 relay.

    Fig 1: Inspecting Circuit Opening Relay (C/OPN)
    G05628298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT INTEGRATION RELAY (IG2) 
    1. Measure the resistance of the IG2 MAIN fuse.
      1. Remove the IG2 MAIN fuse from the integration relay.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

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

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

      3. Install the IG2 MAIN fuse to the integration relay.
    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 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      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 Terminals Of Integration Relay
      G05628299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT INTEGRATION RELAY (EFI) 
    1. Measure the resistance of the EFI MAIN fuse.
      1. Remove the EFI MAIN fuse from the integration relay.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

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

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

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

      Standard Resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      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 Terminals Of Integration Relay
      G05628299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT EFI NO. 2 RELAY 
    1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    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 relay.

    Fig 4: Identifying Terminals Of EFI NO. 2 Relay
    G05628298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT INTEGRATION RELAY (A/F) 
    1. Measure the resistance of the A/F fuse.
      1. Remove the A/F fuse from the integration relay.
      2. Measure the resistance according to the value(s) in the table below.

        Standard Resistance 

        TESTER CONNECTION SPECIFIED CONDITION CHART

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

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

      3. Install the A/F fuse to the integration relay.
    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 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    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 1 A-2 and 1A-3 Below 1 Ω

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

    Fig 5: Identifying Terminals Of Integration Relay
    G05628302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT MAIN BODY ECU (IG1 NO. 1) 
    1. Measure the resistance according to the value(s) in the table below.
    Fig 6: Identifying Terminals Of Main Body ECU
    G05628303Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    Standard Resistance 

    TESTER CONNECTION SPECIFIED CONDITION CHART

    Tester Connection Condition Specified Condition
    2A-1-2B-17 Battery voltage is not applied to terminals 2B-5 and 2D-43 10 kΩ or higher
    Battery voltage is applied to terminals 2B-5 and 2D-43 Below 1 Ω

    If the result is not as specified, replace the main body ECU.

  7. INSPECT STARTER RELAY (ST)  (See RELAY )
  8. INSPECT STARTER CUT RELAY (ST CUT)  (See RELAY )
  9. INSPECT MAIN BODY ECU (ACC RELAY)  (See ON-VEHICLE INSPECTION )
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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.