DTC P148F: Engine Coolant Pump Over Revolution [10/2013 - ]: Description

The ECM controls the engine water pump assembly by calculating the necessary amount of coolant flow based on engine coolant temperature, engine speed and vehicle speed information. The speed of the engine water pump assembly is controlled steplessly using a duty cycle signal sent from the ECM. This optimal control enhances warm-up performance and reduces cooling losses, thus reducing the specific fuel consumption of the engine. The ECM monitors the speed of the engine water pump assembly and stores a DTC when it determines that the engine water pump assembly rotates excessively based on the fact that the actual speed is higher than the target for a certain amount of time.

DTC No.	DTC Detection Condition	Trouble Area
P148F	When both of the following conditions are met for 5 seconds or more (1 trip detection logic): Engine water pump assembly duty ratio is 85% or more. Actual engine water pump assembly speed has been more than the target by a certain amount.	Lack of engine coolant Engine coolant leak Engine water pump assembly