Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. FUEL PUMP ASSEMBLY OPERATION

(a) Check fuel pressure.

(1) Connect the Techstream to the DLC3.

(2) Start the engine.

(3) Turn the Techstream on.

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

(5) Select the Data List item: Fuel Pressure (High)

(6) 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 delivery pipe with sensor assembly LH (fuel pressure sensor).

(b) Check operating sound.

(1) Remove the front wiper motor and link assembly.

Click here

(2) Remove the outer cowl top panel sub-assembly.

Click here

(3) Start the engine.

(4) 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.

(5) Stop the engine.

(6) Install the outer cowl top panel sub-assembly.

Click here

(7) Install the front wiper motor and link assembly.

Click here