Monitor Description

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.