2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Automatic Transmission System: Initialization

  1. PERFORM ROAD TEST TO ALLOW TCM TO LEARN 
    CAUTION:
    • Perform the following procedures while strictly observing all traffic laws and speed limits.
    • Do not accelerate or decelerate rapidly.
    1. "Road test" procedure is as follows
      1. Warm up the engine
      2. According to the replaced parts, perform the road test shown below.
        ROAD TEST REFERENCE

        Replaced Parts Road Test
        • Automatic transmission assembly
        • TCM
        • Valve body assembly
        • Shift solenoid valve SL3
        • Engine assembly
        • ECM
        		 Perform pattern 1, 2 and 3
        Pattern 1 *1 
        With shift lever in D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approx 30 km/h (19 mph)
        Pattern 2: 
        When driving at approximately 50 km/h (31 mph) with the D4 range selected, release the accelerator pedal to allow the vehicle to decelerate gradually to approximately 10 km/h (6 mph)
        Pattern 3:*2 
        Accelerate to a speed higher than 50 km/h (31 mph) While gradually decelerating with shift lever in M and 5th gear selected, downshift to 4th gear at approx 50 km/h (25 mph), to 3rd gear at approx 40 km/h (25 mph), and to 2nd gear at approx 30 km/h (19 mph)
        • Shift solenoid valve SL1
        • Shift solenoid valve SL2
        • Shift solenoid valve SL4
        • Shift solenoid valve SL5
        		 Perform pattern 1 and 3
        Pattern 1*1 
        With shift lever in D, after gradually accelerating to 50 km/h (31 mph) or more, gradually decelerate to approx 30 km/h (19 mph)
        Pattern 3:*2 
        Accelerate to a speed higher than 50 km/h (31 mph) While gradually decelerating with shift lever in M and 5th gear selected, downshift to 4th gear at approx 50 km/h (25 mph), to 3rd gear at approx 40 km/h (25 mph), and to 2nd gear at approx 30 km/h (19 mph)
        HINT
        • *1 After gradually accelerating for a distance of approximately 130 m (426 4 ft) for a period of approximately 15 seconds, gradually decelerate for a distance of approximately 45 m (147.6 ft.) for a period of approximately 5 seconds.
        • *2. Accelerate the vehicle to a speed slightly higher than 50 km/h (31 mph)

          Move the shift lever to M and select 5th gear Release the accelerator pedal and allow the vehicle to decelerate gradually

          When the vehicle decelerates to approximately 50 km/h (31 mph), downshift to 4th gear.

          When the vehicle decelerates to approximately 40 km/h (25 mph), downshift to 3rd gear.

          When the vehicle decelerates to approximately 30 km/h (19 mph), downshift to 2nd gear

        • When decelerating, apply the brakes as necessary to adjust the vehicle speed
        Fig 1: Road Test Pattern
        G05751351Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT

        • *1 The speed, time and distance values are approximate values.
        • *2 After accelerating, the deceleration does not need to be performed immediately.
        • *3 There is no specified time or distance
      3. Repeat the road tests until the shift shock and engine speed overrun (engine speed flare when shifting) reach an acceptable level
        NOTE: When repeating the acceleration/ deceleration cycle of a road test pattern, bring the vehicle to a complete stop before accelerating again.
  2. RESET MEMORY 
    NOTE:
    • Perform Reset Memory (AT initialization) when replacing the engine assembly or ECM.
    • Reset Memory can be performed only with the Techstream.
    • Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.

    HINT

    The TCM (ECT) memorizes the vehicle conditions when controlling the automatic transmission assembly and engine assembly

    1. The "Reset Memory" procedure is as follows
      1. Turn the engine switch off
      2. Connect the Techstream to the DLC3
      3. Turn the engine switch on (IG)
      4. Turn the Techstream on
      5. Enter the following menus Powertrain / ECT / Utility / Reset Memory
        NOTE: After performing the Reset Memory, be sure to perform the Road Test described previously (See ROAD TEST  ).
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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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