2006 Lexus IS 350FACTORY OEM SERVICE PROCEDURE

Automatic Transmission Unit: Disassembly

CAUTION: When working with FIPG material, perform the following:
  • Using a razor blade and gasket scraper, remove all the old FIPG material from the gasket surfaces.
  • Thoroughly clean all components to remove any loose material.
  • Clean both sealing surfaces with a non-residue solvent.
  • Apply FIPG in a continuous line (width approximately 1 mm (0.04 in.)) along the sealing surface.
  • Parts must be assembled within 10 minutes of application. Otherwise, the FIPG material must be removed and reapplied.
  1. REMOVE TRANSMISSION CASE COVER 
    1. Remove the 2 bolts and transmission case cover.
      Fig 1: Identifying Transmission Case Cover
      G04053145Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. REMOVE TRANSMISSION CONTROL SHAFT LEVER RH 
    1. Remove the nut, spring washer and the transmission control shaft lever RH.
      Fig 2: Identifying Transmission Control Shaft Lever RH
      G04053146Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. REMOVE PARK/NEUTRAL POSITION SWITCH ASSEMBLY 
    1. Using a screwdriver, unstake the lock washer.
    2. Remove the nut and lock washer.
    3. Remove the bolt and park/neutral position switch.
      Fig 3: Identifying Park/Neutral Position Switch
      G04053147Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. REMOVE TRANSMISSION OIL COOLER 
    1. Remove the 3 bolts, transmission oil cooler, and spacer.
      Fig 4: Identifying Transmission Oil Cooler And Spacer
      G04053148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 O-rings from the transmission oil cooler.
    3. Remove the 2 O-rings from the spacer.
      Fig 5: Identifying Spacer O-Rings
      G04053117Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. REMOVE TRANSMISSION REVOLUTION SENSOR 
    1. Remove the 2 bolts and the 2 transmission revolution sensors.
    2. Remove the O-ring from each sensor.
      Fig 6: Identifying Transmission Revolution Sensors
      G04053150Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. REMOVE AUTOMATIC TRANSMISSION BREATHER TUBE 
    1. Remove the 2 bolts.
    2. Remove the breather tube.
      Fig 7: Identifying Breather Tube
      G04053151Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. REMOVE AUTOMATIC TRANSMISSION HOUSING 
    1. Remove the 10 bolts.
    2. Remove the transmission housing.
      Fig 8: Identifying Transmission Housing
      G04053152Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. REMOVE AUTOMATIC TRANSMISSION FLANGE YOKE ASSEMBLY 
    1. Using a hammer and chisel, loosen the staked part of the nut.
    2. Remove the nut and flange yoke.
      Fig 9: Loosening Staked Part Of Nut
      G04053153Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the oil seal from the flange yoke.
      Fig 10: Identifying Oil Seal And Automatic Transmission Flange Yoke
      G04053154Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. REMOVE EXTENSION (ATM) HOUSING SUBASSEMBLY 
    1. Remove the 6 bolts.
      Fig 11: Identifying Extension (ATM) Housing Subassembly Bolts
      G04053155Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Using a screwdriver, remove the extension housing sub-assembly.
      Fig 12: Identifying Extension Housing Sub-Assembly
      G04053156Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Using a snap ring expander, remove the snap ring.
    4. Remove the thrust needle roller bearing and the 2 bearing races.
      Fig 13: Identifying Snap Ring
      G04053157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. REMOVE REAR COVER SLEEVE 
    1. Remove the 2 washers and rear cover sleeve.
      Fig 14: Identifying Rear Cover Sleeve
      G04053158Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. REMOVE TRANSMISSION CASE ADAPTOR RADIAL BALL BEARING 
    1. Remove the transmission case adaptor radial ball bearing from the extension housing sub-assembly.
      Fig 15: Identifying Transmission Case Adaptor Radial Ball Bearing
      G04053159Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. REMOVE AUTOMATIC TRANSMISSION EXTENSION HOUSING OIL SEAL 
    1. Using a screwdriver, remove the oil seal.
      Fig 16: Identifying Oil Seal
      G04053160Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. FIX AUTOMATIC TRANSMISSION CASE SUBASSEMBLY 
    1. Install the transmission case on the overhaul attachment.
      Fig 17: Identifying Transmission Case With Overhaul Attachment
      G04053161Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. REMOVE AUTOMATIC TRANSMISSION OIL PAN SUB-ASSEMBLY 
    NOTE: Do not turn the transmission over as this will contaminate the valve body with foreign matter located at the bottom of the pan.
    1. Remove the overflow plug and the gasket.
    2. Remove the drain plug and the gasket.
    3. Remove the 20 bolts, oil pan and gasket.
      Fig 18: Identifying Oil Pan Bolts
      G04053008Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Examine particles in the pan.
      1. Remove the magnets from the oil pan. Use the removed magnets to collect any steel chips. Look carefully for the chips and particles in the pan and on the magnet to anticipate the type of wear which might be found in the transaxle. Steel (magnetic): bearing, gear, and plate wear Brass (non-magnetic): bearing wear
        Fig 19: Inspecting For Chips And Steel Particles In Pan
        G04089157Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. REMOVE VALVE BODY OIL STRAINER ASSEMBLY 
    1. Turn over the transmission.
    2. Remove the 4 bolts and valve body oil strainer assembly from the valve body.
      Fig 20: Identifying Valve Body Oil Strainer Assembly And Valve Body
      G04053164Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the O-ring from the valve body oil strainer assembly.
      Fig 21: Identifying O-Ring And Valve Body Oil Strainer Assembly
      G04053165Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. REMOVE TRANSMISSION WIRE 
    1. Remove the bolt and disconnect the ATF temperature sensor.
      Fig 22: Identifying ATF Temperature Sensor
      G04053166Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 2 bolts and disconnect the 2 clamps.
      Fig 23: Identifying Clamps
      G04053167Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the 9 connectors from the shift solenoid valves.
      Fig 24: Identifying Connectors And Shift Solenoid Valves
      G04053168Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Remove the bolt from the transmission case.
    5. Pull the transmission wire out of the transmission case.
      Fig 25: Locating Transmission Internal Wiring Harness bolt
      G04019558Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Remove the O-ring from the transmission wire.
      Fig 26: Identifying Transmission Wire Harness O-Ring
      G04053316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. REMOVE TRANSMISSION VALVE BODY ASSEMBLY 
    1. Remove the bolt, detent spring cover and detent spring.
      Fig 27: Identifying Bolt
      G04053171Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the 20 bolts.
    3. Remove the valve body assembly.
      Fig 28: Identifying Valve Body Assembly
      G04053172Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. REMOVE TRANSAXLE CASE GASKET 
    1. Remove the 3 transaxle case gaskets.
      Fig 29: Identifying Transaxle Case Gaskets
      G04053173Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. REMOVE BRAKE DRUM GASKET 
    1. Remove the 3 brake drum gaskets.
      Fig 30: Identifying Brake Drum Gaskets
      G04053174Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. REMOVE CHECK BALL BODY 
    1. Remove the check ball body and the spring.
      Fig 31: Identifying Check Ball Body And Spring
      G04053175Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  21. REMOVE C-2 ACCUMULATOR PISTON 
    1. While blowing compressed air into the oil hole, remove the C-2 accumulator piston and the spring.
    2. Remove the 2 O-rings from the pistons.
      NOTE: Take care as the C-3 and B-3 accumulator pistons may jump out.
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.