2015 VOLVO S80 engine

03 Your driving environment
Start/Stop*
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* Option/accessory, for more information, see Introduction.131
Introduction
Start/Stop is a function that is available with certain engines/transmissions. It temporarilyswitches off the engine when the vehicle isnot moving, for instance in heavy traffic or ata traffic light to help reduce fuel consumption.
Function and use
Start/Stop symbol in the instrument panel
Start/Stop button on the center console
Start/Stop is activated automatically each time the engine is started 1
. The symbol in the
instrument panel will be displayed for several seconds when the engine starts and the indi-cator light in the On/Off button will remainilluminated while the function is activated. All of the vehicle's systems will function while the engine is auto-stopped, although the function of certain systems may reduced atthis time. For example, blower speed andhigh infotainment system volume may bereduced to help conserve the battery'scapacity.
Auto-stopping the engineNormally, when Start/Stop is activated andthe brakes are applied until the vehicle comesto a standstill, the engine will auto-stop auto-matically
if the driver keeps the brake pedal
depressed .
To remind the driver that the enginehas been auto-stopped, theStart/Stop symbol will illuminate inthe instrument panel and remain on
until the engine restarts.
If the ECO function* (see page 128) is activated, theengine may auto-stop beforethe vehicle comes to a com-plete standstill.
Auto-starting the engineThe engine restarts as soon as the driver releases the brake pedal.
Deactivating Start/StopIn certain situations (e.g.,driving in heavy, stop-and-gotraffic), it may be preferableto deactivate Start/Stop. This is done by pressing the button in the center console.
The indicator light in the button will go out. Start/Stop will remain deactivated until the button is pressed again or until the engine isswitched off and restarted by the driver.
Hill Start Assist (HSA)When starting on steep hills, HSA (see page 121) retains pressure on the brake pedalfor several seconds after the pedal has beenreleased in order to keep the vehicle at astandstill. The brakes will be released afterseveral seconds or when the driver pressesthe accelerator pedal.
1 Not when the engine is started using the optional Engine Remote Start feature, see page 118

03 Your driving environment
Start/Stop*
03
132* Option/accessory, for more information, see Introduction.
Auto-stop exceptions
In certain situations or conditions, the engine may not auto-stop when the vehicle comes
to a standstill, such as if:
Condition/situation
The vehicle's speed has not reached a speed of approx. 5 mph (ca 8 km/h) afterthe most recent auto-start or after thedriver has started the engine.
The driver unbuckles his/her seat belt.
The main battery's charge is below the minimum level.
The engine has not reached its normal operating temperature.
The ambient temperature is below freezing or above approx. 85°F (30°C).
The windshield's heating function* is acti- vated.
The climate system cannot keep the desired settings in the passenger compart-ment; the blower will operate at highspeed.
The vehicle is backing up.
Condition/situation
The main battery's temperature is below freezing or too high.
The driver is turning the steering wheel hard.
The road's incline is very steep.
A trailer's electrical system is connected to the vehicle.
The hood has been opened A
.
The transmission has not reached its nor- mal operating temperature.
Atmospheric pressure is below a level equivalent to an altitude of approx. 4,900–8,200 ft (1500–2500 m) above sea level.The actual pressure is also affected by cur-rent weather conditions.
The Adaptive Cruise Control's* Queue Assist feature is activated.
The gear selector is in the SB
or " +/–" posi-
tion.
A Certain engines only
B Sport mode (where applicable)
Auto-start exceptions
In certain situations or conditions, the engine may auto-start even though the driver is still
pressing the brake pedal, such as if:
Condition/situation
Condensation forms on the windows.
The climate system cannot keep the desired settings in the passenger compart-ment.
Electrical current consumption is tempo- rarily high or the main battery's charge isbelow the minimum level.
The brake pedal is pumped repeatedly.
The hood has been opened A
.
The vehicle begins to move or increases speed slightly (if the engine auto-stoppedbefore the vehicle was at a standstill (seepage 128)).
The driver unbuckles his/her seat belt while the gear selector is in the D or N positions.
The steering wheel is turned A
.

03 Your driving environment
Start/Stop*
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* Option/accessory, for more information, see Introduction.133
Condition/situation
The gear selector is moved from D to SB
, R
or " +/–".
The driver's door is opened with the gear selector in D – an audible signal and a text
message will inform the driver thatStart/Stop is active.
A Certain engines only
B Sport mode (where applicable)
WARNING
Do not open the hood if the engine has auto-stopped. The engine could suddenlyauto-start. Before opening the hood:
• Switch off the ignition using the START/STOP ENGINE
button.
• Be aware that if the engine has beenrunning, components in the enginecompartment will be very hot.
If the engine does not auto-start, this could be due to
:
• The driver's seat belt is not fastened
• The gear selector is in
P and the driver's
door is opened
In these cases, the driver will have to restart the engine by pressing the START/STOP
ENGINE button.
Settings
Settings for the Start/Stop function can be made in the MY CAR menu system.Symbols and messages
Text messagesCombined with the information sym- bol in the instrument panel, theStart/Stop function may also display
messages in certain situations. Follow theinstructions provided in the message. The fol-lowing table gives several examples.

03 Your driving environment
Start/Stop*
03
134* Option/accessory, for more information, see Introduction.
SymbolMessageInformation/action
Auto Start/Stop Service requiredStart/Stop is not functioning properly. Contact a Volvo retailer or a trained and qualified Volvo service technician.
Autostart Engine running + an
audible signalThis is triggered if the driver's door is opened while the engine is auto-stopped.
-Press Start buttonThe engine will not auto-start. Start the engine normally by pressing the START/STOP ENGINE
button.
-Select P or N to startStart/Stop has been deactivated. Move the gear selector to N or P and start the engine normally
be pressing the START/STOP ENGINE button.
-Press Start buttonThe engine will not auto-start. Move the gear selector to N or P and start the engine normally be
pressing the START/STOP ENGINE button.
If the message does not disappear after the suggested action has been taken, contact aVolvo retailer or a trained and qualified Volvoservice technician.

03 Your driving environment
Brakes
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136
The adaptive brake lights activate if: •The ABS system activates for more than approximately a half second
• In the event of sudden braking while thevehicle is moving at speeds aboveapproximately 6 mph (10 km/h)
When the vehicle has come to a stop, the brake lights and additional taillights remain onfor as long as the brake pedal is depressed oruntil braking force on the vehicle is reduced.
Power brakes function only when the engine is running
The power brakes utilize vacuum pressure which is only created when the engine is run-ning. Never let the vehicle roll to a stop withthe engine switched off. If the power brakes are not working, consid- erably higher pressure will be required on thebrake pedal to compensate for the lack ofpower assistance. This can happen for exam-ple when towing your vehicle or if the engineis switched off when the vehicle is rolling. Thebrake pedal feels harder than usual.
Water on brake discs and brake pads affects braking
Driving in rain and slush or passing throughan automatic car wash can cause water tocollect on the brake discs and pads. This willcause a delay in braking effect when the pedal is depressed. To avoid such a delaywhen the brakes are needed, depress thepedal occasionally when driving through rain,slush, etc. This will remove the water from thebrakes. Check that brake application feelsnormal. This should also be done after wash-ing or starting in very damp or cold weather.
Severe strain on the brake systemThe brakes will be subject to severe strainwhen driving in mountains or hilly areas, orwhen towing a trailer. Vehicle speed is usuallyslower, which means that the cooling of thebrakes is less efficient than when driving onlevel roads. To reduce the strain on thebrakes, shift into a lower gear and let theengine help with the braking. Do not forgetthat if you are towing a trailer, the brakes willbe subjected to a greater than normal load.
Anti-lock braking system (ABS)The Anti-lock Braking System (ABS) helps toimprove vehicle control (stopping and steer-ing) during severe braking conditions by limit-ing brake lockup. When the system "senses"impending lockup, braking pressure is auto-matically modulated in order to help preventlockup that could lead to a skid. The system performs a brief self-diagnostic test when the engine has been started anddriver releases the brake pedal. Another auto-matic test may be performed when the vehi-
cle first reaches a speed of approximately6 mph (10 km/h). The brake pedal will pulsateseveral times and a sound may be audiblefrom the ABS control module, which is nor-mal.
Cleaning the brake discsCoatings of dirt and water on the brake discsmay result in delayed brake function. Thisdelay is minimized by cleaning the brake lin-ings. Cleaning the brake pads is advisable in wet weather, prior to long-term parking, and afterthe vehicle has been washed. Do this bybraking gently for a short period while thevehicle is moving.
Emergency Brake AssistanceEBA is designed to provide full brake effectimmediately in the event of sudden, hardbraking. The system is activated by the speedwith which the brake pedal is depressed. When the EBA system is activated, the brake pedal will go down and pressure in the brakesystem immediately increases to the maxi-mum level. Maintain full pressure on thebrake pedal in order to utilize the systemcompletely. EBA is automatically deactivatedwhen the brake pedal is released.

03 Your driving environment
Brakes
03
137
NOTE
•When the EBA system is activated, the brake pedal will go down and pressurein the brake system immediatelyincreases to the maximum level. Youmust maintain full pressure on thebrake pedal in order to utilize the sys-tem completely. There will be no brak-ing effect if the pedal is released. EBAis automatically deactivated when thebrake pedal is released.
• When the vehicle has been parked forsome time, the brake pedal may sinkmore than usual when the engine isstarted. This is normal and the pedalwill return to its usual position when itis released.
Symbols in the instrument panel
SymbolSpecification
Steady glow – Check the brake fluid level. If the level is low, fillwith brake fluid and check forthe cause of the brake fluidloss.
Steady glow for two seconds when the engine is started –There was a fault in the brakesystem's ABS function whenthe engine was last running.
WARNING
If and come on at the
same time and the brake level is below the MIN mark in the reservoir or if a brake sys-
tem-related message is shown in the infor-mation display: DO NOT DRIVE . Have the
vehicle towed to a trained and qualifiedVolvo service technician and have thebrake system inspected.

03 Your driving environment
Parking brake
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139
Releasing the electric parking brake
Parking brake control
Manual release1. Fasten the seat belt.
2. Insert the remote key in the ignition slotand press the START/STOP ENGINE
button (or press the START/STOP
ENGINE button with a valid remote key in
the passenger compartment on vehicles with the optional keyless drive). 3. Press firmly on the brake pedal.
4. Pull the parking brake control.
Automatic release1. Start the engine.
NOTE
•
For safety reasons, the parking brake is only released automatically if the engineis running and the driver is wearing aseat belt.
• The electric parking brake will bereleased immediately when the acceler-ator pedal is pressed and the gearselector is in position
D or R.
2. Fasten the seat belt.
3. Move the gear selector to position D or R
and press the accelerator pedal. The parking brake will release when the vehi-cle begins to move.
Heavy load uphillA heavy load, such as a trailer, can cause the vehicle to roll backward when the parkingbrake is released automatically on a steepincline. To help avoid this:
1. Keep the electric parking brake lever pushed in with the left hand while shifting into Drive with the right.
2. While pressing the accelerator pedal to pull away, release the parking brake leveronly after the vehicle begins to move.
Symbol and messages in the instrument panel
See page 199 for information about display- ing or erasing messages.
SymbolMessageDescription/action
"Message"Read the message in the information display
A flashing symbol indicates that the parking brake is being applied. If the symbol flashes in any other situation then this means that a fault has arisen. Read the message on the information display.

04 Driver support
Stability system
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144
Introduction
The Dynamic Stability and Traction Control system (DSTC) consists of a number of func-tions designed to help reduce wheel spin,counteract skidding, and to generally helpimprove directional stability.
CAUTION
A pulsating sound will be audible when the system is actively operating and is normal.
Traction control (TC)This function is designed to help reduce wheel spin by transferring power from a drivewheel that begins to lose traction to thewheel on the opposite side of the vehicle (onthe same axle). TC is most active at low speeds.This is one of DSTC's permanent functions and cannot be switched off.
Active Yaw Control (AYC)This function helps maintain directional stabil-ity, for example when cornering, by brakingone or more of the wheels if the vehicleshows a tendency to skid or slide laterally.This is one of DSTC's permanent functionsand cannot be switched off.
Spin control (SC)The spin control function is designed to helpprevent the drive wheels from spinning whilethe vehicle is accelerating.
Trailer Stability Assist – TSATrailer Stability Assist helps stabilize a vehiclethat is towing a trailer when the vehicle andtrailer have begun to sway. See page 288 formore information. This system is automatically deactivated if the driver selects
Sport mode.
Operation
Sport modeThe stability system is always activated and cannot be switched off. However, the driver can select Sport mode,
which offers more active driving characteris- tics. In this mode, the engine managementsystem monitors movement of the acceleratorpedal and steering wheel for sportier driving by allowing more lateral movement of the rearwheels before DSTC is activated. Under certain circumstances, such as when driving with snow chains, or driving in deepsnow or loose sand, it may be advisable totemporarily use
Sport mode for maximum
tractive force. If the driver releases pressure on the acceler- ator pedal, DSTC will also activate to helpstabilize the vehicle. To switch to Sport mode:
1. Press the My Car button in the center
console control panel and select
My S80
DSTC in the menu.
2. Unselect the symbol and leave the menu by pressing EXIT.
> This puts DSTC in Sport mode.
Sport mode remains active until the driver
switches it off in the menu or until the engine is switched off. DSTC will return to normalmode when the engine is restarted.