On-Vehicle Inspection [08/2020 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus ES 250, 2023 Lexus ES 250, 2022 Lexus ES 250, and 2021 Lexus ES 250. However, it is still accessible from the selected car via links, so may be relevant.

FUEL PUMP ASSEMBLY OPERATION

Check fuel pressure.

Connect the Techstream to the DLC3.
Start the engine.
Turn the Techstream on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Target Fuel Pressure Offset.

Powertrain > Engine > Active Test

Active Test Display
Control the Target Fuel Pressure Offset

Data List Display
Fuel Pressure (High)

Select the Data List item: Fuel Pressure (High).
Check that the fuel pressure fluctuates when the target fuel pressure changes.
HINT:

The target fuel pressure operation decreases the target fuel pressure by 12.5% or increases the target fuel pressure by 24.8%.

If the result is not as specified, replace the fuel pump assembly or fuel pressure sensor.

Check operating sound.
1. Remove the No. 1 engine cover sub-assembly.
  Refer to PROCEDURE - Step 20 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 20 [08/2021 - 09/2022] , or refer to PROCEDURE - Step 20 [09/2022 - ]
2. Start the engine.
3. Using a sound scope, check the operating sound of the fuel pump assembly.
  If no sound can be heard, check the fuel pump assembly, wire harness and ECM.
4. Stop the engine.
5. Install the No. 1 engine cover sub-assembly.
  Refer to PROCEDURE - Step 48 [08/2020 - 08/2021] , or refer to PROCEDURE - Step 49 [08/2021 - ]