2015 Citroen DS5 HYBRID4 stop start

39Frequently asked questions
DS5Hy4_en_Chap11_questions-frequentes_ed01-2015
Reducing consumption / Fuel
QuestionAnswer
How can I optimise my fuel consumption? Give preference to AUTO mode as it selects in the best way the "driving energy source" to use in order to reduce fuel consumption. You should also adapt your driving style to the characteristics of hybrid vehicles to get the best out of it, for example by taking your foot off the accelerator pedal rather than braking and by anticipating decelerations which allows the recovery of "free" energy for charging the battery (entering a built-up area, stop at traffic lights, stop at halt signs, ...).
Why do I not manage to reduce my fuel consumption even though I often drive in ZEV (Zero Emissions Vehicle) mode?
It is not ZEV mode but AUTO mode that is the most appropriate for reducing fuel consumption, as it selects the best "driving energy source". ZEV mode (100% electric running) can reduce fuel consumption in some cases. However, recharging the traction battery has an energy cost. This is why we recommend using AUTO mode more often.
Why does the trip computer sometimes display the bars for 28 mpg (10 litres/100 km) in town? In traffic jams, the fuel consumption graph displayed may temporarily appear high when the distance covered is very low, but this generally has very little impact and the true average fuel consumption will remain low. In urban driving, your Hybrid4 will remain more efficient in terms of fuel consumption (by around 35%) compared to a conventional vehicle.
Why is my battery rarely fully charged? A partly charged battery is normal operation (4 to 5 bars on average in AUTO mode). This allows some capacity to be left free for the recovery for energy when going downhill or taking when your foot off the accelerator.
Why are there so may fuel alert messages when starting to use the reserve? To encourage you to refuel as soon as possible and to avoid loosing the possibility of all electric running.

DS5Hy4_en_Chap11_questions-frequentes_ed01-2015
Air conditioning / Heating
QuestionAnswer
It seems to me that the vehicle runs less on electric when the heating or air conditioning is operating, is that right?
The demand for heating or air conditioning may require the starting of the HDi Diesel engine until the desired level of comfort is attained. Normal operation of the Hybrid4 system is simply put back. The period can be longer under very low or very high ambient temperatures.
It seems to me that when it is very hot and the air conditioning is working, the vehicle runs on electric for shorter periods. Is that right?
When it is hot, the periods when the HDi Diesel engine is put on standby and the vehicle runs on electric are necessarily restricted in order to limit the difference between the temperature in the vehicle and the level of comfort selected. In very hot weather, it is always possible to press the " ECO OFF " button (which brings the vehicle out of ZEV mode and prevents electric running or the stopping of the engine) to give preference to temperature control (keeps the air conditioning running).
Miscellaneous
QuestionAnswer
Is towing possible with my Hybrid4 vehicle? For information on the towing ability of your Hybrid4 vehicle, refer to " Weights and towed loads" in the "Technical data" section. This allows a jet ski or two-wheeler on a trailer to be towed, for example. This limit is related to maintaining adequate cooling capacity for the HDi Diesel engine as well as the hybrid components that are also cooled by the engine's cooling system.
Why does engine braking seem so strong? When you take your foot off the accelerator, the engine braking results mainly from the energy recovery by the electric motor. This leads to a higher level of deceleration than a conventional vehicle and so allows the recovery of "free" energy.

41Alphabetical index
DS5Hy4_en_Chap12_index-recherche_ed01-2015
Advice on driving ............................................23Air conditioning .........................................22, 25
Backup starting ...............................................18Bag hook .........................................................31Battery, 12 V ......................................................5Battery, high voltage ........................5, 27-29, 35Boot floor, removable ......................................31
Car wash .........................................................32Cooling, high voltage battery ..........................29
Ignition on........................................................17Indicator, power.............................................8, 9Instrument panel ...............................................8Instrument panel screen .......................8, 10, 13
Mode selector .......................................Mode selector .......................................Mode selector7, 19, 24Motor, electric .......................................5, 19, 35
Gear selector ..................................................Gear selector ..................................................Gear selector32
Head-up display ..............................................16Heating ......................................................22, 25High voltage ..............................................27, 28High voltage cable ..........................................28Histogramme, fuel consumption .....................12
Fittings, boot ...................................................31Flat bed (recovery) ..........................................34Four wheel drive ...........................19, 21, 23, 34Fuel consumption ..................................9, 12, 24
Opening the bonnet ........................................30
READY lamp .....................................8, 9, 28, 30Recovery of the vehicle ..................................34Regeneration of the particle filter ......................Regeneration of the particle filter ......................Regeneration of the particle filter5, 26Reset histogramme .........................................14Reset trip ...................................................13, 14Retaining strap ................................................31
Keyless Entry and Starting ..................15, 17, 18Key not recognised .........................................18
Parcel shelf, rear .............................................Parcel shelf, rear .............................................Parcel shelf, rear31Parking brake, electric ........................15, 23, 32Particle emission filter ................................Particle emission filter ................................Particle emission filter5, 25Power ................................................................Power ................................................................Power9Puncture ..........................................................33
Snow chains ....................................................34Speedometer ....................................................Speedometer ....................................................Speedometer8Starting the Hybrid4 system .....................15, 18State of charge, battery ..................5, 10, 25, 27Stop & Start .......................................4, 6, 11, 27Storage ............................................................31Switching off the Hybrid4 system .............15, 18
Defrosting ........................................................25Demisting ........................................................25Driving economically ......................................24
Eco-driving .....................................................24ECO OFF (switch) ...........................................22Electric running (ZEV) ............11, 20, 22, 24, 25Electronic gearbox ..........................7, 15, 23 -25Electronic key .......................................15, 17, 18Emergency switching off .................................Emergency switching off .................................Emergency switching off18Energy flows .............................................1 0 , 11Energy recovery ....................................9, 11, 24Engine compartment ......................................30Engine, Diesel ...............5, 19, 22, 25, 32, 36, 37Environment ....................................................24