Monitor Description
WARNING: This page is about a different car, the 2019 Toyota Highlander, 2018 Toyota Highlander, and 2017 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
The MG ECU performs many diagnostic tests to verify proper operation of internal ECU systems. In one of these tests, the MG ECU checks for an R/D (Resolver/Digital Converter) malfunction involving the generator resolver. If the MG ECU detects an R/D error, it will conclude that there is an internal malfunction involving the generator resolver and the hybrid vehicle control ECU assembly will illuminate the MIL and store a DTC.