2008 Lexus LS 600hLFACTORY OEM SERVICE PROCEDURE

Inspection Procedure

  1. INSPECT FOR EXHAUST GAS LEAK 
    1. Allow the engine to idle.
    2. Check for exhaust gas leak around the HO2S

      OK: No leak from the HO2S. 

    NG: REPAIR LEAK 

    OK: Go to next step 

  2. CHECK HEATED OXYGEN SENSOR 
    Fig 1: Fuel-Trim And Rear HO2S Voltage Graph
    G05771028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Put the engine in inspection mode (see INSPECTION MODE PROCEDURE ).
    2. Warm up the engine.
    3. Allow the engine to idle.
    4. Enter the following menus:
      1. Intelligent tester - Select: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
      2. Techstream - Select: Powertrain / Engine and ECT Active Test / Control the Injection Volume for A/F Sensor.
    5. Check the O2S B1S2 (O2S B2S2) values when the A/F CONTROL (Control the Injection Volume for A/F Sensor) is -12.5% (Lean fuel-trim).
    6. Check the O2S B1S2 (O2S B2S2) values when the A/F CONTROL (Control the Injection Volume for A/F Sensor) is 25% (Rich fuel-trim).

      Standard 

      STANDARD CHART

      A/F CONTROL O2S B1S2 (O2S B2S2)
      -12.5% Below 0.2 V
      25% More than 0.8 V

    NG: REPLACE HEATED OXYGEN SENSOR  (See REMOVAL )

    OK: Go to next step 

  3. CHECK DTC 
    1. Clear DTC (see DTC CHECK/CLEAR )
    2. Turn the power switch OFF.
    3. Disconnect the cable from the negative battery terminal and wait for 1 minute.
    4. Connect the cable to the negative battery terminal.
    5. Turn the power switch ON (READY).
      Fig 2: Driving Pattern Graph
      G05149425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Perform the drive pattern.
      1. Warm up the engine.
      2. Accelerate the vehicle until 80 km/h (50 mph) and stop the vehicle.
      3. Drive the vehicle by 60 to 80 km/h (35 to 50 mph) for 5 minutes or more.
    7. Check DTC.

      OK: P0607 is not present. 

    NG: REPLACE ECM  (See REMOVAL )

    OK: CHECK FOR INTERMITTENT PROBLEMS  (See CHECK FOR INTERMITTENT PROBLEMS )

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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