2012 911 Section 2-2 11/3/11 10:15 AM Page 51
911 Carrera 911 Carrera S
2.12 Coasting function The 911 Carrera models now feature the coasting function in conjunction with the Porsche Doppelkupplung (PDK). Coasting refers to operating the vehicle with the
DME engine electronics
engine disengaged, for example on slight downhill gradients; the engine is operated at idle speed so that the function of the auxiliary systems (alternator, air-conditio-
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ning compressor, coolant pump, etc.) is maintained.
During coasting, the kinetic and potential energy of the vehicle is directly used to overcome driving resistance. Although no fuel is used during deceleration with deceleration fuel cutoff, the vehicle is significantly decelerated. If no deceleration is
Activating and deactivating coasting mode Coasting mode is activated and deactivated using the Auto Start Stop button.
Deactivating:
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• Press button (1) • The indicator light in the button lights up red • Coasting mode is deactivated and automatic stopping of the engine is suppressed
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desired, additional fuel must be used to cover the lost distance.
1 The Auto Start Stop button switches the Auto Start Stop function on and off and activates and deactivates
Activating: • Press button (1) • The indicator light in the button goes off • Coasting mode is activated and the engine is automatically switched off when the vehicle stops
coasting mode.
Prerequisites for coasting mode: • Driving in selector lever position D • Coasting mode is activated (indicator light in the button is off) • Sport or Sport Plus mode is deactivated • PSM is active • Control cruise mode is not active • Engine, transmission and battery have reached operating temperature • Relaxed/economic driving style • Only a slight uphill or downhill gradient • Remove foot slowly from accelerator pedal The engine is disengaged and runs at idle speed. The vehicle rolls with no engine braking effect. Coasting mode can be identified by the tachometer showing idle speed.
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