Some 2015 – 2016 model year RC F and 2016 GS F vehicles may exhibit an abnormal buzzing noise condition from the low pressure fuel pump. The Engine Control Module (ECM) logic has been modified to reduce the possibility of this condition. Please follow the Repair Procedure below to address this condition.More about Lexus repair,please check:Lexus Trouble Repair
Note:The ECM (PCM) should NOT be replaced as part of the Repair Procedure.
2.Using Techstream, confirm calibration ID. If the calibration ID listed IS the latest ECM (PCM) calibration, disregard this Service Bulletin and continue diagnosis per the Repair Manual.
3.Check for the Authorized Modifications Label affixed to the vehicle in the location shown below. Confirm if the ECM (PCM) calibration has been updated. If the calibration ID listed is NOT the latest ECM (PCM) calibration – go to step 4. If the calibration ID listed IS the latest ECM (PCM) calibration, disregard this Service Bulletin and continue diagnosis per the Repair Manual.
4.Flash reprogram the ECM (PCM).
NOTE:DTCs may set during software update. If DTCs set, please clear the codes at the completion of the update. If DTCs remain after clearing, please perform a 12V battery reset on the vehicle.
5.Install the Authorized Modifications Label.
A.Using a permanent marker, enter the following information on the label:
B.Affix the Authorized Modifications Label to the vehicle at the location shown.
6.Test drive the vehicle to confirm the noise is no longer present.
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