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 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.