Component description for the purge control valve - GF47.30-P-2020CY

MODEL 204.0 with ENGINE 272.911 up to Model Year 8

MODEL 204.0/2 with ENGINE 272.921 up to Model Year 8

MODEL 204.0/2 with ENGINE 272.947 up to Model Year 8

MODEL 204.0 with ENGINE 272.948 up to Model Year 8

MODEL 204.0/2 with ENGINE 272.961 up to Model Year 8

MODEL 204.0 with ENGINE 272.971 up to Model Year 8

Location

Fig 1: Identifying Purge Control Valve

Courtesy of MERCEDES-BENZ USA

The switchover valve is located in the front left of the engine compartment.

Task

When regeneration is enabled, the switchover valve opens the purge line between the activated charcoal filter and the intake manifold. In this way, it is possible to suction off the fuel vapors from the activated charcoal filter.

For USA version

The switchover valve is opened and closed for leak testing of the regeneration system.

Function

Fig 2: Identifying Purge Control Valve

Courtesy of MERCEDES-BENZ USA

The switchover valve is actuated by the ME-SFI [ME] control unit (N3/10) by means of a PWM signal (pulse width modulated signal) according to the operating conditions of the engine.

At the same time, the passage of the purge line from the activated charcoal filter to the variable intake manifold (a => b) is opened.

The switchover valve is always closed in the idle state (de-energized).

The voltage is supplied through "terminal 87 M2". The frequency of the PWM signal is 10 Hz.

In order to suppress pulsation noises a fluid reservoir is located the purge line upstream of the switchover valve.