Monitor Description
WARNING: This page is about a different car, the 2004 Toyota Prius. However, it is still accessible from the selected car via links, so may be relevant.
The HV control ECU performs many diagnostic tests to verify proper operation of internal and external ECU systems. In one of these monitors, the HV control ECU checks the motor main CPU serial communication link.
If the HV control ECU detects a failure, it will conclude that there is an internal malfunction involving the HV control ECU to motor main CPU communication link. The HV control ECU will illuminate the MIL and set a DTC.