Monitor Description
WARNING: This page is about a different car, the 2025 Toyota Highlander, 2024 Toyota Highlander, and 2023 Toyota Highlander. However, it is still accessible from the selected car via links, so may be relevant.
The ECM outputs an operation duty signal (IWPO) to steplessly control the speed of the electric water pump assembly. The ECM outputs an operation duty signal (IWPO) to the electric water pump assembly and monitors the actual duty signal (IWPO) being output. When the operation duty signal (IWPO) is being output to the electric water pump assembly and the actual operation duty signal (IWPO) is a certain value or less, the ECM detects a malfunction and stores a DTC.