Monitor Description
WARNING: This page is about a different car, the 2025 Lexus RX 350, 2024 Lexus RX 350, and 2023 Lexus RX 350. 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 actual operation duty signal (IWPO) exceeds a certain value when outputting an operation duty signal (IWPO) to the electric water pump assembly, the ECM detects a malfunction and stores a DTC.