DTC P1D9A: General Description
The power control unit (PCU) controls the PCU electric coolant pump according to the rotational speed of the PCU electric coolant pump calculated from the frequency (duty fixed to 50 %) detected from the NEWP terminal. If, when a trouble with EWP input duty signal, leak of coolant, or another event leads to unexpected small load and then over rotation, the NEWP output of "intermittent operation" output by the EWP out of a specified value for a specified time, the motor control module in the PCU detects a malfunction and stores a DTC.