Fuel evaporation control system, function - GF47.30-P-3013CY
MODEL 204.0 with ENGINE 272.911 up to Model Year 2008
MODEL 204.0/2 with ENGINE 272.921 up to Model Year 2008
MODEL 204.0/2 with ENGINE 272.947 up to Model Year 2008
MODEL 204.0 with ENGINE 272.948 up to Model Year 2008
MODEL 204.0/2 with ENGINE 272.961 up to Model Year 2008
MODEL 204.0 with ENGINE 272.971 up to Model Year 2008
- Aeration of the fuel tank
Aeration of the fuel tank takes place via the breather valve and activated charcoal filter.
Aeration of the fuel tank during refueling takes place via the refueling, limiting and bleed valve.
The refueling, limiting valve and bleed valve also prevents overfilling by closing the vent line.
- Venting the fuel tank
Venting of the fuel tank (operational ventilation) takes place via the breather valves and the activated charcoal filter.
In this case, the fuel vapors flow to the activated charcoal filter, where they are stored or drawn into the variable intake manifold in case of enabled regeneration.
Rollover valves are integrated above in the breather valves which close off the aeration and ventilation system for a rollover in order to prevent fuel escaping.
- Regeneration
To control the purge quantity, the purge control valve is actuated by the ME-SFI [ME] control unit (N3/10) at the ground end by means of a PWM signal (pulse width modulated signal).
The purge quantity is determined by continuously opening and closing the purge control valve with on-periods of varying durations. The frequency of the PWM signal is 10 Hz.
The following input signals are processed in the ME-SFI control unit for this purpose:
- Engine speed
- Coolant temperature
- Air mass
- Intake air temperature
- Oxygen sensor signals upstream of the catalytic converter
When the engine is running, the fuel vapors stored in the activated charcoal filter are drawn off through the purge control valve and combusted in the engine.
The purge control valve is actuated by the ME-SFI [ME] control unit if:
- Coolant temperature > 40 °C
- Engine start before >45 s
- Engine not in overrun mode
- Engine not in the lambda adaptation phase
The idle speed control prevents changes in engine speed resulting from purging. A leaner fuel-air mixture is produced in line with loading of the activated charcoal filter with fuel vapors.
With code 494 USA version
During refueling the fuel vapors are collected additionally from the fuel tank and passed on to the activated charcoal filter (ORVR = O nboard R efueling V apor R ecovery). In this case a larger activated charcoal filter is installed.
The activated charcoal filter shutoff valve (Y58/4) and fuel tank pressure sensor (B4/3) are also installed for leak testing of the evaporative emission control system.
| Electrical function diagram for the evaporative emission control system | PE47.30-P-2050-99FAB | |||
| Component description for the coolant temperature sensor | B11/4 | GF07.04-P-6043CY | ||
| Component description for the oxygen sensor | G3/3, G3/4 | Oxygen sensor upstream of TWC [KAT] | GF07.04-P-6101CY | |
| Crankshaft Hall sensor component description | B70 | GF07.04-P-6221CY | ||
| Component description for the hot film mass air flow sensor | B2/5, B2/5b1 | GF07.07-P-6000CY | ||
| Component description for the ME-SFI [ME] control unit | N3/10 | GF07.61-P-6000CY | ||
| Component description for the throttle valve actuator | M16/6 | GF30.20-P-2021CY | ||
| Component description for the fuel tank | 75 | GF47.10-P-2000CY | ||
| Component description for the activated charcoal filter | 77 | GF47.30-P-2011CY | ||
| Component description for the purge control valve | Y58/1 | GF47.30-P-2020CY | ||
| Component description for the fuel tank pressure sensor | B4/3 | With code 494 USA version |
GF47.30-P-2101CY | |
| Component description for the activated charcoal filter shutoff valve | Y58/4 | With code 494 USA version |
GF47.31-P-2101CY | |