2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Automatic Transmission System: Precaution

NOTE:
  • When disconnecting the cable from the negative (-) battery terminal, initialize the following systems after the cable is reconnected.
SYSTEM NAME REFERENCE

System Name See Procedure
Power Window Control System INITIALIZATION
NOTE:
  • If any parts are replaced, perform the following as necessary referring to the table below.
COMPONENTS REFERENCE

Replaced Part Reset Memory*1 Set Transmission Compensation Code Learning by Driving (Road Test)
Automatic transmission assembly -*2 Perform*3 Perform
  • Valve body assembly
  • Shift solenoid valve SL1, 2, 3, 4 and 5
- - Perform
TCM
(If possible, read the transmission compensation code from the previous TCM)
Possible - Perform*4 Perform
Impossible - Perform*5 Perform
  • Engine assembly
  • ECM
Perform - Perform
HINT
  • *1 Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal
  • *2 When "Set Transmission Compensation Code" is performed, "Reset Memory" is automatically completed
  • *3 Set the compensation code for the new automatic transmission
  • *4. Read the compensation code from the previous TCM, then transfer it to the new TCM
  • *5 Set the transmission compensation code of the current automatic transmission
  • Registration of the transmission compensation code (See REGISTRATIONΒ  ).
  • Learning by driving (Road Test) (See INITIALIZATIONΒ  )
  • Reset Memory (See INITIALIZATIONΒ  )
NOTE: Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.
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:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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