2007 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

Inspection Procedure

HINT:

Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.

  1. INSPECT FUSE (ETCS) 
    Fig 1: Inspecting ETCS Fuse From Engine Room No. 1 Relay Block
    G05291485Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Remove the ETCS fuse from the engine room No. 1 relay block.
    2. Measure the resistance of the fuse.

      Standard resistance: 

      Below 1 Ω 

    NG: CHECK FOR SHORT IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE 

    OK: Go to next step 

  2. READ VALUE OF INTELLIGENT TESTER (+BM VOLTAGE) 
    1. Connect the intelligent tester to the CAN VIM. Then connect the CAN VIM to the DLC3.
      Fig 2: Identifying E2 ECM Connector Terminals
      G05291486Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON.
    3. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ALL / +BM.

      Standard voltage: 

      9 to 14 V 

    OK: CHECK FOR INTERMITTENT PROBLEM 

    NG: Go to next step 

  3. CHECK WIRE HARNESS (ETCS FUSE - ECM AND BATTERY) 
    1. Remove the ETCS fuse from the engine room No. 1 relay block, junction block.
    2. Disconnect the E2 ECM connector.
      Fig 3: Disconnecting E2 ECM Connector Terminals
      G05291487Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance of the wire harness side connectors.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION CHART

      Tester Connection Specified Condition
      Relay block ETCS fuse terminal 1 - Battery positive (+) terminal Below 1 Ω
      Relay block ETCS fuse terminal 2 - E2-5 (+BM) Below 1 Ω
      Relay block ETCS fuse terminal 1 or Battery positive (+) terminal - Body ground 10 kΩ or higher
      Relay block ETCS fuse terminal 2 or E2-5 (+BM) - Body ground 10 kΩ or higher

    NG: REPAIR OR REPLACE HARNESS AND CONNECTOR 

    OK: REPLACE ECM 

Factory Service Tools

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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.

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