On-Vehicle Inspection [09/2014 - 11/2017]: Procedure

WARNING: This page is about a different car, the 2017 Lexus RC 350, 2017 Lexus RC 300, 2016 Lexus RC 350, 2016 Lexus RC 300, and 2015 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK 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 / Fuel Press.

Powertrain > Engine > Active Test

Active Test Display
Control the Target Fuel Pressure

Data List Display
Fuel Press

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 25%.

If the result is not as specified, replace the fuel pump assembly or fuel delivery pipe sub-assembly (fuel pressure sensor).

Check operating sound.

Remove the V-bank cover sub-assembly.
Refer to PROCEDURE - Step 4 [09/2014 - 10/2015] , or refer to PROCEDURE - Step 4 [10/2015 - 11/2017]
Start the engine.

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.

Stop the engine.
Reinstall the V-bank cover sub-assembly.
Refer to PROCEDURE - Step 117 [09/2014 - 10/2015] , or refer to PROCEDURE - Step 118 [10/2015 - 11/2017]