2009 Lexus LS 600hLFACTORY OEM SERVICE PROCEDURE

Hybrid Transmission System

  1. RESET MEMORY
    NOTE:
    • If either the hybrid vehicle transmission assembly or hybrid vehicle control ECU is replaced, initialize the learned value of RESET MEMORY.
    • Wait 1 minute after disconnecting the negative battery terminal before performing RESET MEMORY.
    • The RESET MEMORY can be performed only by using the Techstream.

    HINT: 

    Disconnecting the negative battery terminal does not initialize (clear) the learned value.

    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (READY) and turn the Techstream on.
    3. Select the following menu items:
      NOTE:

      Check that the shift lever is in the P position and turn the power switch on (READY).

      1. Techstream - Select : Powertrain / Hybrid Control / Data List. Read the data list before performing Reset Memory.
        CHECK ITEM (TECHSTREAM)

        Item Specified Condition
        +B 9 to 16 V
        WOUT Control Power 1000 W or more
        T/M Oil Temperature 10 to 100 °C (50 to 212 °F)
        NOTE:
        • Do not depress the accelerator pedal during Reset Memory.
        • Do not move the shift lever from the P position.
        • If the specified conditions above are not satisfied, warm up the hybrid system with the power switch on (READY) until each item meets the specified condition.
    4. Select the following menu items:
      1. Techstream - Select: Powertrain / Hybrid Control / Reset Memory.
        WARNING:

        After performing Reset Memory, be sure to perform a road test described earlier.

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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.