Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual: Precaution

NOTICE:

• Before replacing the ECM, refer to Registration.

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• If any parts are replaced, perform the following procedures as necessary referring to the table below.

  Replaced Part		Reset Memory*1	Set Transaxle Compensation Code	Learning by Driving (Road Test)
  Automatic transaxle assembly		-*2	Input*3	Perform
  Shift solenoid valve SL1 and SL2		-	-	Perform
  Transmission valve body assembly Shift solenoid valve SL3, SL4 and SL5		-	Initialize	Perform
  ECM (If possible, read the transaxle compensation code from the previous ECM)	Possible	-	Input (into the new ECM)*4	Perform
  	Impossible	-	Initialize*5	Perform
  Engine assembly		Perform	-	Perform

HINT:

• *1: Reset Memory cannot be completed by only disconnecting and reconnecting the cable to the negative (-) battery terminal.
• *2: When "Set Transaxle Compensation Code" is performed, "Reset Memory" is automatically completed.
• *3: Set the transaxle compensation code for the new automatic transaxle.
• *4: Read the transaxle compensation code from the previous ECM, then transfer it to the new ECM.
• *5: Set the transaxle compensation code of the current automatic transaxle.
• Registration of the transaxle compensation code.

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• Learning by driving (Road Test).

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• Reset Memory.

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NOTICE:

• The automatic transaxle is composed of precision-made parts. Careful inspection before reassembly is necessary because even a small nick could cause fluid leakage or affect performance.
• The procedures are organized so that you work on only one component group at a time. This will help avoid confusion with similar-looking parts of different sub-assemblies being on your workbench at the same time.
• The component groups are inspected and repaired from the converter housing side.
• Whenever possible, complete the inspection, repair and reassembly before proceeding to the next component group. If a defect is found in a certain component group during reassembly, inspect and repair this group immediately. If a component group cannot be assembled because parts are being ordered, be sure to keep all parts of the group in a separate container while proceeding with disassembly, inspection, repair and reassembly of other component groups.
• Use of Toyota Genuine ATF WS is recommended.
• All disassembled parts should be cleaned, and compressed air should be blown through any fluid passages and holes.
• Dry all parts with compressed air. Never use a piece of cloth.
• The recommended ATF or kerosene should be used for cleaning.
• After cleaning, the parts should be arranged in the order they were removed for efficient inspection, repair and reassembly.
• New brake discs and clutch discs must be soaked in ATF for at least 15 minutes before reassembly.
• All oil seal rings, clutch discs, clutch plates, rotating parts, and sliding surfaces should be coated with ATF prior to reassembly.
• All old gaskets and rubber O-rings must be replaced.
• Do not apply adhesive cement to gaskets or similar parts.
• Make sure that the ends of snap rings are not aligned with any cutouts. Make sure that snap rings are correctly installed into the grooves.
• If a worn bushing is to be replaced, the sub-assembly containing the bushing must also be replaced.
• Check the thrust bearings and races for wear or damage. Replace them if necessary.
• Use petroleum jelly to keep parts in place.
• When working with seal packing (FIPG), observe the following:
  • Using a razor blade and a gasket scraper, remove all of the old seal packing (FIPG) from the gasket surface.
  • Thoroughly clean all components to remove any seal packing (FIPG).
  • Clean both sealing surfaces with a non-residue solvent.
  • Parts must be reassembled within 10 minutes of application. Otherwise, the seal packing (FIPG) must be removed and reapplied.

Automatic Transaxle System

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Definition Of Terms

DEFINITION OF TERMS Term Definition Monitor description Description of what the ECM monitors and how it detects malfunctions (monitoring purpose and details). Related DTCs Group of di ...

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