mercedesbenz Workshop Repair Guides

Mercedes Benz Workshop Service and Repair Manuals

GF47.30-P-2020V Purge Control Valve - Description of Components|Page 8295 > < GF47.30-P-2020V Purge Control Valve - Description of Components|Page 8293
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Canister Purge Control Valve: Description and Operation
GF07.61-P-3013V Purge Control Valve Actuation, Function

GF07.61-P-3013V Purge Control Valve Actuation, Function

To control the purge quantity, the purge control valve is actuated at the ground side by the ME-SFI control unit by means of a pulse width-modulated
signal (PWM signal). The purge quantity is determined by constantly opening and closing the purge control valve for on and off periods of various
lengths.

The frequency of the PWM signal is selected from a speed- dependent characteristic in such a way, that all cylinders are uniformly supplied with fuel
vapors.

The purge control valve is actuated when the engine is at operating temperature, but not in deceleration fuel shutoff.

The following information is processed in the ME-SFI control unit:

-

Engine speed

-

Air mass

-

Coolant temperature

-

Intake air temperature

-

Lambda signals

GF47.30-P-2020V Purge Control Valve - Description of Components|Page 8295 > < GF47.30-P-2020V Purge Control Valve - Description of Components|Page 8293