On-Vehicle Inspection [10/2024 - ]: Procedure

WARNING: This page is about a different car, the 2025 Lexus RX 450h+, 2025 Lexus RX 350h, 2024 Lexus RX 450h+, 2024 Lexus RX 350h, and 2023 Lexus RX 350h. However, it is still accessible from the selected car via links, so may be relevant.

REMOVE NO. 2 ENGINE UNDER COVER ASSEMBLY
HINT:

Refer to PROCEDURE - Step 1

INSPECT HYBRID TRANSAXLE FLUID

NOTE:

w/ Oil Pump with Motor Assembly:

To obtain an accurate measurement, make sure to operate the engine assembly and oil pump with motor assembly as specified in the following procedure before checking the hybrid transaxle fluid level.

Pre-procedure1

Start the engine and oil pump with motor assembly. (w/ Oil Pump with Motor Assembly)
1. Put the engine in Inspection Mode (Maintenance Mode).
  HINT:
  
  Refer to INSPECTION MODE PROCEDURE [10/2022 - ]
2. Idle the engine for 30 seconds with the ignition switch ON (READY).
  HINT:
  
  By starting the engine in inspection mode (maintenance mode), the oil pump with motor assembly operates.
3. Turn the ignition switch off.

Using a 10 mm hexagon socket wrench, remove the filler plug and gasket from the hybrid vehicle transaxle assembly.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check that the hybrid transaxle fluid level is between 0 to 10 mm (0 to 0.394 in.) from the bottom lip of the filler plug opening.

*a	0 to 10 mm (0 to 0.394 in.)

NOTE:

When inspecting the hybrid transaxle fluid, make sure that the vehicle is level.
Be sure to directly check that the hybrid transaxle fluid level is within the specified range.
Driving the vehicle with an insufficient or excessive amount of hybrid transaxle fluid may damage the hybrid vehicle transaxle assembly.
w/ Oil Pump with Motor Assembly:
If the hybrid transaxle fluid was replaced or if hybrid transaxle fluid was added, make sure to recheck the hybrid transaxle fluid level after starting the engine assembly and oil pump with motor assembly.
w/o Oil Pump with Motor Assembly
If the hybrid transaxle fluid was replaced or if hybrid transaxle fluid was added, make sure to recheck the hybrid transaxle fluid level after driving the vehicle.

Post-procedure1

Check for leaks if the hybrid transaxle fluid level is low. (If there are no hybrid transaxle fluid leaks but the hybrid transaxle fluid level is low, add hybrid transaxle fluid.)
HINT:

See step 3
Using a 10 mm hexagon socket wrench, install the filler plug and a new gasket to the hybrid vehicle transaxle assembly.
Torque: 50 N.m (510 kgf/cm, 37 ft.lbf)

INSPECT FOR HYBRID TRANSAXLE FLUID LEAK
HINT:

See step 5
INSTALL NO. 2 ENGINE UNDER COVER ASSEMBLY
HINT:

Refer to PROCEDURE - Step 6