Hybrid Powertrain Control Module (HPCM) External Inputs

The HPCM monitors several hardwired inputs from the following sources:

High Voltage (HV) Interlock (HVIL) is a switched input that monitors access to the HV DC connectors. If opened, it will cause the HV circuit to be de-energized and the vehicle will be shut down.
Clean Tach Out (CTO) is a signal from the ECM, which is used to determine Engine Speed.
Electric Motor Position Sensors are used to measure the angular position of the rotor for the motor and generator.
Electric Drive Temperature Sensors are used to monitor hardware component temperatures that are critical to the electric drive system.
Electric Vehicle (EV) Mode is a driver-selectable switched input that determines the driver's request for one of the special EV driving modes (PHEV only).