Monitor Description
WARNING: This page is about a different car, the 2015 Lexus IS 250 and 2014 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
If the fuel pressure increases despite a decrease request signal being sent to the fuel pump (for high pressure) by the ECM, the ECM will illuminate the MIL and store this DTC.
If there is minimal difference between the fuel pressure before and after the fuel relief valve operates, a DTC is output.