Monitor Description
The ECM monitors the position of the water valve based on the valve position signal that is output by the water valve position sensor (potentiometer), which is coupled coaxially to the valve. The water valve effects control in three steps as indicated above, and the ECM determines the position of the valve according to the voltage of the respective step.
In order to ensure the proper monitoring of the water valve, the ECM checks for malfunctions with the combination of the output of the potentiometer and CHS tank outlet temperature sensor.
If no changes occur in the valve position signal that is being input into the ECM or if the response signal from the water valve is very slow, despite the ECM commanding the water valve motor to operate the ECM determines that a malfunction has occurred in the water valve position sensor circuit, and sets a DTC.