The purpose of this bulletin is to address a specific issue with the 2023 model year Highlander vehicles equipped with a T24A-FTS engine, which may exhibit a MIL ON condition with Diagnostic Trouble Code (DTC) POSCEOO.
Repair Procedure
The repair procedure involves using GTS+ to confirm if the ECM (PCM) calibration has been updated, and if not, flashing the ECM (PCM) with the NEW calibration file update using the battery diagnostic tool.
Tools and Equipment Needed
A battery diagnostic tool, Techstream ADVI, TSADVUNIT, Techstream Lite, and GTS+ software version 2023.03.002.02 or later are required.
The repair procedure also includes clearing any DTCs and testing the vehicle to confirm the condition is no longer present.
Manual:
Download: TOYOTA Technical Service Bulletin – MIL ON With DTC POSCEOO
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