SCR tank heater solenoid valve, component description

W14.40-1194-11

Location

Y107 SCR tank heater solenoid valve

The SCR tank heater solenoid valve (Y107) is located at the right side of the engine underneath the starter

Task

Coolant is branched off via the SCR tank heater solenoid valve (Y107) from the engine coolant circuit to heat the AdBlue line circuit and the AdBlue tank.

W14.40-1083-01

Design

1 Electrical connector

2 Line fitting (coolant from engine)

3 Line fitting (coolant to pump module)

Y107 SCR tank heater solenoid valve

The SCR tank heater solenoid valve (Y107) is a 2/2- way valve with line fittings (2, 3) for coolant lines.

Inside the valve, the valve body is designed as a solenoid armature.

Function

The SCR tank heater solenoid valve (Y107) is actuated by the MR control unit. Via the fill level and SCR temperature combination sensor integrated in the AdBlue tank, it detects when the temperature of the tank contents is approaching the defined limit value of around 8 °C. As soon as the coolant reaches a temperature of 65 °C, the SCR tank heater solenoid valve receives the signal to open (Y107) from the MR control unit, so that coolant is branched off from the engine coolant circuit.

The coolant supply line is connected at the line fitting (2). When the SCR tank heater solenoid valve is not open (Y107), the coolant is available at the closed valve body inside the component.

This valve body keeps the passage between the coolant supply line and the coolant working line closed via the force of a push spring.

When a current is supplied, the valve body slides and the passage is opened, so that coolant can flow into the coolant working line.

When the current is interrupted, the spring pushes it back into its starting position. This action recloses the passage between the coolant supply line and the coolant working line.