Monitor Description
WARNING: This page is about a different car, the 2025 Toyota Corolla Cross, 2024 Toyota Corolla Cross, and 2023 Toyota Corolla Cross. However, it is still accessible from the selected car via links, so may be relevant.
The ECM receives a frequency signal (WPI) from the inverter water pump with motor assembly and calculates the speed of the inverter water pump with motor assembly. As the frequency signal (WPI) is 4 Hz when the inverter water pump with motor assembly is stopped to enable the ECM to detect an open or short in the signal line, the inverter water pump with motor assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If the inverter water pump with motor assembly speed is calculated to be less than 10 rpm, the ECM judges that there is an open or short in the WPI circuit and stores this DTC.