brake VOLVO S90 TWIN ENGINE 2019 Repair Manual

DRIVER SUPPORT
400
Parking with Park Assist Pilot
Park Assist Pilot (PAP119) helps the driver parkusing three different steps. The function can alsohelp the driver pull out of a parking space.

NOTE
The PAP function measures the space andsteers the vehicle – the driver's role is to:
keep close watch of the area around thevehicle
follow the instructions on the center dis-play
change gears (reverse/forward) – a"ping" sound indicates when the drivershould change gears
regulate and maintain a safe speed
apply the brakes and stop.
Information about the actions required by thedriver are provided in the center display usingsymbols, graphics and/or text.
PAP can be activated if the following criteria havebeen met after the engine is started:
No trailer is hitched to the vehicle
Your vehicle's speed is lower than 30 km/h(20 mph).
NOTE
The distance between the vehicle and parkingspots should be 0.5-1.5 meters (1.6-5.0 ft)when PAP is looking for parking.

Parking
PAP parks the vehicle using the following steps:
1. The system searches for and measurespotential parking spaces.
2. The vehicle is steered while it is backing intothe parking space.
3. The vehicle is positioned in the parkingspace (the driver may be prompted to shiftgears).

Searching for and measuring potential
parking spots
The function can be activatedin the center display's Functionview.
It can also be accessed fromthe camera views.
Parallel parking overview.
Perpendicular parking overview.
To do so:
119Park Assist Pilot

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DRIVER SUPPORT
404

The parking sequence is cancelled
A parking sequence will be cancelled if:
the driver moves the steering wheel
the vehicle's speed exceeds 7 km/h (4 mph)
the driver taps Cancel in the center display
when the anti-lock brakes or the Electronicstability control are engaged - e.g. when awheel loses grip on a slippery road
when the power steering works at reducedpower - e.g. during cooling due to overheat-ing (see section "Speed-dependent steeringforce").
A message in the center display will explain whythe parking sequence was cancelled.

CAUTION
Under certain circumstances, PAP may not beable to find parking spaces – one reason maybe that the sensors are disrupted by externalsound sources that emit the same ultrasonicfrequencies that the system works with.
Examples of such sources include horns, wettires on asphalt, pneumatic brakes, exhaustnoise from motorcycles, etc.
NOTE
Dirt, ice and snow covering the sensorsreduce their function and can make measure-ment impossible.

Driver responsibility
The driver should keep in mind that PAP is aparking aid ‒ not an infallible fully automatic sys-tem. The driver must always be prepared to takecontrol and cancel a parking sequence if neces-sary.
There are a number of things to keep in mindwhen parking, including:
The driver is always responsible for determin-ing if the space suggested by PAP is suita-ble for parking.
Do not use PAP when using snow chains ora temporary spare tire.
Do not use PAP if there are any objects pro-truding from the vehicle.
Heavy rain or snowfall may inhibit PAP's abil-ity to accurately measure a parking space.
While searching and measuring the parkingspace, PAP may be unable to detect objectslocated far into the space.
PAP may not suggest parking spaces onnarrow streets if it does not detect sufficientspace for maneuvering the vehicle.
Use approved tires121 inflated to the correcttire pressure because this affects PAP's abil-ity to provide parking assistance.
PAP's function is based on the way the vehi-cles are parked behind and in front of yourparking space. If they are, for example,parked too close to the curb, there is a riskthat your vehicle's tires or wheel rims couldbe damaged by the curb during the parkingprocedure.
Perpendicular parking spaces may not bedetected or may be suggested unnecessarilyif a parked vehicle is sticking out more thanother parked vehicles.
PAP is intended to provide parking assis-tance on straight streets, not sections ofstreet with sharp curves or bends. Alwaysmake sure that your vehicle is parallel to rel-evant parking spaces when PAP is measur-ing the parking space.

CAUTION
Switching to another approved wheel and/ortire dimension could change the tire circum-ference, which would then require the PAPsystem to be updated. Consult a workshop –an authorized Volvo workshop is recom-mended.
121"Approved tires" refers to tires of the same type and make as the vehicle's original, factory-installed tires.

HYBRID INFORMATION
408
General information about TwinEngine
Twin Engine vehicles are driven just like anyother vehicle, but certain functions differ from avehicle powered exclusively by gasoline. Theelectric motor powers the vehicle primarily at lowspeeds; the gasoline engine is used at higherspeeds or during more active driving.
The instrument panel displays Twin Engine-spe-cific information - charging information, selecteddrive mode, distance to discharged battery andhybrid battery charge level.
Different drive modes can be selected while driv-ing, e.g. electric power only or, if more power isneeded, a combination of electric and gasolinepower. The vehicle calculates the optimal combi-nation of driveability, driving experience, environ-mental impact and fuel economy for the selecteddrive mode.
In order to function optimally, the hybrid battery(and its electrical drive systems) and the gasolineengine (and its drive systems) must be at thecorrect operating temperature. Battery capacitycan be considerably reduced if the battery is toocold or too hot. Preconditioning prepares thevehicle's drive systems and passenger compart-ment before driving to help reduce both wear andenergy consumption. It also helps increase thehybrid battery's range.
The hybrid battery which powers the electricmotor is recharged using the charging cable. It
can also be recharged during light braking andthrough engine braking in gear position B. Thecombustion engine can also help recharge thehybrid battery.

Important
No electrical current
Keep in mind that if there is no electrical currentto the vehicle, i.e. the ignition is switched off orthe start battery is discharged, certain functionssuch as brakes, power steering, etc. will not work.

WARNING
If the vehicle does not have electrical currentand both the electric motor and the gasolineengine are switched off, the brakes cannot beused to stop the vehicle.

Towing not permitted
Never tow a Twin Engine vehicle behind anothervehicle, as this could damage the electric motor.

Exterior engine noise
WARNING
Please be aware that there is no sound fromthe engine when the vehicle is being poweredby the electric motor and it may be difficult todetect by children, pedestrians, cyclists andanimals. This is especially true at low speeds.
High-voltage electrical current
WARNING
A number of electrical components in TwinEngine Plug-in Hybrid vehicles use high-volt-age current and can be extremely dangerousif handled incorrectly. These components andany orange wiring in the vehicle may only behandled by trained and qualified Volvo servicetechnicians.
Do not touch anything that is not clearly descri-bed in this Owner's Manual.

Related information
Charging the hybrid battery (p. 409)
Hybrid gauge (p. 83)
Drive modes (p. 446)
Starting and stopping preconditioning(p. 225)
Hybrid battery (p. 605)
Factors affecting electric motor range(p. 455)

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HYBRID INFORMATION
410
Charging cable handle and charging socket.
Charging status is indicated in three ways:
The indicator lights in the charging module(the unit connected to the wall outlet).
Indicator light in the vehicle's chargingsocket.
Images and text in the instrument panel.
The start battery is charged while the hybrid bat-tery is charging and stops charging when thehybrid battery is fully charged.
If the hybrid battery's temperature is below-10 ºC (14 ºF) or above 40 ºC (104 ºF), some ofthe vehicle's functions may be reduced or notavailable at all.
The electric motor cannot be used if the battery'stemperature is too low or too high. If the PUREdrive mode is selected, the gasoline engine willstart.

Charging using the gasoline engine
The vehicle generates electrical current to charge thebattery, e.g. when the driver lightly presses the brakepedal or when engine braking is used on downgrades.
The vehicle can also generate current to thehybrid battery to charge it.
The hybrid battery can also be recharged bylightly depressing the brake pedal, i.e. duringlight braking. This converts the vehicle'skinetic energy to electrical energy, which isused to charge the hybrid battery.
In gear position B, the electric motor brakesthe vehicle when the accelerator pedal isreleased and the hybrid battery is rechargedat the same time.
The combustion engine can also helprecharge the hybrid battery.
Related information
Charge cable (p. 411)
Charging current (p. 411)
Opening and closing the charging socketcover (p. 414)
Initiating hybrid battery charging (p. 415)
Stopping hybrid battery charging (p. 421)
Charging status in the charging cable'scharging module (p. 417)
Charging status in the vehicle's chargingsocket (p. 417)
Charging status in the instrument panel(p. 419)
Twin Engine symbols and messages in theinstrument panel (p. 422)
Gear selector positions for automatic trans-missions (p. 440)
Changing drive mode (p. 449)
Long-term storage of vehicles with hybridbatteries (p. 424)

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HYBRID INFORMATION
420

NOTE
If the instrument panel is not used, it will godark after a period of time. To reactivate thedisplay:
depress the brake pedal,
open one of the doors, or
put the ignition in mode I by turning theSTART knob clockwise and then releas-ing.

Related information
Charging the hybrid battery (p. 409)
Twin Engine symbols and messages in theinstrument panel (p. 422)
Charging status in the vehicle's chargingsocket (p. 417)
Charging status in the charging cable'scharging module (p. 417)
Stopping hybrid battery charging (p. 421)

STARTING AND DRIVING
* Option/accessory.426
Starting the vehicle
The vehicle can be started using the start knobin the tunnel console when the remote key is inthe passenger compartment.
Start knob in the tunnel console.

WARNING
Before starting:
Buckle your seat belt.
Adjust the seat, steering wheel and mir-rors.
Make sure you can fully depress thebrake pedal.
The remote key is not physically used to start theignition because the vehicle is equipped with thekeyless Passive Start system.
To start the vehicle:
1.The remote key must be inside the vehicle.For vehicles with Passive Start, the key mustbe in the front section of the passengercompartment. With the optional keyless lock-ing/unlocking function*, the key can be any-where in the vehicle.
2. Press and hold down the brake pedal1 as faras possible.
3. Turn the start knob clockwise and release.The control will automatically return to theoriginal position.
WARNING
Never use more than one inlay mat at atime on the driver's floor. If any other typeof floor mat is used, remove the originalmat from the driver's seat floor beforedriving. All types of mats must be securelyanchored in the attachment points in thefloor. Make sure the floor mat does notimpede the movement of the brake pedalor accelerator pedal in any way, as thiscould be a serious safety hazard.
Volvo's floor mats are specially manufac-tured for your vehicle. They must be prop-erly secured in the attachment points inthe floor to help ensure they cannot slideand become trapped under the pedals.
The starter motor will crank until the enginestarts or until overheating protection is triggered.
During normal start conditions, the vehicle's elec-tric motor will be prioritized and the gasolineengine will remain off. This means that once thestart knob is turned clockwise, the electric motorhas been "started" and the vehicle is ready to bedriven. The warning and information symbols inthe instrument panel will go out and the selectedtheme will be displayed to indicate that the elec-tric motor is activated.
1If the vehicle is moving, it is only necessary to turn the start knob clockwise to start the engine.

STARTING AND DRIVING
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427
In some situations, such as in cold weather or ifthe hybrid battery's charge level is too low, thegasoline engine will start instead.
The vehicle should not be started with the charg-ing cable connected. However, if the cable can-not be pulled out or if the vehicle incorrectlydetects a cable that is not connected, the vehiclecan be started using an override procedure:
1.Press the brake pedal and turn the startknob clockwise.
2.Charge cable Remove before start willappear in the instrument panel.
3. Turn the start knob clockwise again.
4.Removed? Turn and hold start knob 7swill appear. Turn the knob clockwise and holdit for 7 seconds to start the vehicle.
Location of the backup reader in the tunnel console.
If the Vehicle key not found message is shownin the instrument panel at start, place the remotekey at the backup reader and then make a newstart attempt.

NOTE
When the remote key is placed in the backupreader, make sure that no other vehicle keys,metal objects or electronic devices (e.g. cellu-lar phones, tablets, laptops or chargers) are inthe backup reader. Multiple vehicle keys closeto each other in the backup reader can dis-rupt their functionality.
If Vehicle start System check, wait is dis-played in the instrument panel while attemptingto start the vehicle, wait until the message disap-pears and try again to start the vehicle.

CAUTION
If the engine has not responded after 3attempts – wait for 3 minutes before startinga new attempt. Starting capability increases ifthe starter battery is given time to recover.

NOTE
The vehicle cannot be started if the hybridbattery is discharged.
WARNING
Never remove the remote control key fromthe vehicle while driving.

WARNING
Always remove the remote key from thepassenger compartment when you leavethe vehicle and make sure the ignition isin mode 0.
Always put the gear selector in P andapply the parking brake before leavingthe vehicle. Never leave the vehicle unsu-pervised while the engine is running.
Always open the garage door fully andmake sure that ventilation is very goodbefore starting the engine in a garage.The exhaust fumes produced by the vehi-cle contain carbon monoxide, which isinvisible and odorless but very toxic.

NOTE
With a cold start, idling speed may be consid-erably higher than normal for certain enginetypes. This is done to get the emissions sys-tem up to normal operating temperature asquickly as possible, which minimizes exhaustemissions and protects the environment.

STARTING AND DRIVING
430
Selecting ignition mode
The vehicle's ignition can be put in variousmodes (levels) to make different functions availa-ble.

Selecting an ignition mode
Start knob in the tunnel console.
Ignition mode 0 - Unlock the vehicle andkeep the remote key in the passenger com-partment.

NOTE
To set level I or II without engine start – donot depress the brake pedal (or clutch pedalfor vehicles with manual transmission) whenselecting this ignition mode.
Ignition mode I - Turn the start knob clock-wise and release it. The control will automati-cally return to the original position.
Ignition mode II - Turn the start knob clock-wise and hold it there for approx. 5 seconds.Release the knob, which will automaticallyreturn to its original position.
Back to ignition mode 0 - To return to igni-tion mode 0 from mode I and II, turn the startknob clockwise and release it. The controlwill automatically return to the original posi-tion.
Related information
Starting the vehicle (p. 426)
Switching off the vehicle (p. 428)
Ignition modes (p. 429)
Adjusting the steering wheel (p. 193)
Jump starting using another battery (p. 466)
Brake functions
The vehicle's brakes are used to reduce speedor prevent the vehicle from rolling.
In addition to the wheel brakes and parkingbrakes, the vehicle is also equipped with a num-ber of automatic brake assist functions. Thesesystems help the driver by e.g. keeping the vehi-cle stationary when the brake pedal is notdepressed (e.g. at a traffic light or intersection),when starting up a hill or when driving down a hill.
Depending on how the vehicle is equipped, thefollowing brake assist functions may be included:
Auto-hold brakes (Auto Hold)
Hill Start Assist (Hill Start Assist)
Braking assist after a collision
City Safety

Related information
Brakes (p. 431)
Parking brake (p. 434)
Auto-hold brakes (p. 437)
Braking assist after a collision (p. 439)
Hill Start Assist (p. 439)
City Safety™ (p. 333)

STARTING AND DRIVING
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431
Brakes
The brake pedal is used to apply the vehicle'sregular brakes, which are part of the brake sys-tem.
The vehicle is equipped with two brake circuits. Ifone brake circuit is damaged, the brake pedal willgo down further when depressed. More pressurewill then be required from the driver for normalbraking effect.

WARNING
The power brakes only work when the electricmotor or combustion engine is running.
If the brake pedal is used when the engine isswitched off, greater pressure must be applied tobrake the vehicle.
In very hilly areas or when driving with a heavyload, gear position B can be used to augment thebrakes with engine braking.

Anti-lock brakes
The vehicle is equipped with an Anti-lock BrakingSystem (ABS), which helps prevent the wheelsfrom locking and helps maintain steering controlwhen braking. Vibrations may be felt from thebrake pedal when ABS is operating, which is nor-mal.
After the vehicle is started, a brief test of theABS system is automatically performed when the
driver releases the brake pedal. An additionalautomatic test of the system may be performedwhen the vehicle is traveling at a low speed. Dur-ing the test, the brake pedal may feel as though itis pulsating.
Light braking charges the hybrid battery
When the brakes are applied lightly, the electricmotor braking function is used. This converts thevehicle's kinetic energy into electrical energy,which is used to charge the hybrid battery. Whenthe battery is being charged with the electricmotor braking function, this will be indicated inthe instrument panel.
When the battery is being charged with the electricmotor braking function, this will be indicated in theinstrument panel.
This function is active at speeds in the range of150-5 km/h (93-3 mph). When braking atspeeds outside of this range, or during harderbraking, the hydraulic braking system is used to
augment braking. This is indicated in the instru-ment panel with the pointer down in the red area.
Symbols in the instrument panel
Symbol Meaning
A
B
Check the brake fluid level. If thelevel is low, fill brake fluid andcheck to determine the reason forthe loss of brake fluid.
A
B
Fault in pedal sensor.

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STARTING AND DRIVING
432
Symbol Meaning
A
B
Steady glow for 2 seconds afterthe engine is started: Automaticfunction check.
Steady glow for more than 2 sec-onds: Fault in the ABS system. Thevehicle's regular brake system isstill working, but without the ABSfunction.
If the message Brake pedal Cha-racteristics changed Servicerequired is displayed, the "Brake-by-wire" system is not functioningproperly. Greater pressure will berequired to brake the vehicle.
AIn Canada.BIn the US.

WARNING
If the warning symbols for both brake faultand ABS fault are lit simultaneously, theremay be a fault in the brake system.
If the brake fluid reservoir level is normalwhen this occurs, drive carefully to thenearest workshop to have the brake sys-tem checked - an authorized Volvo work-shop is recommended.
If the brake fluid has fallen below the MINlevel in the brake fluid reservoir, the vehi-cle should not be driven until the brakefluid has been filled. The reason for thebrake fluid loss must be checked.

Related information
Brake Assist System (p. 432)
Auto-hold brakes (p. 437)
Hill Start Assist (p. 439)
Braking on wet roads (p. 433)
Braking on salted roads (p. 433)
Maintenance of the brake system (p. 433)
Brake lights (p. 156)
Brake Assist System
The brake enhancing system, Brake AssistSystem (BAS), helps increase braking force andthereby reduce braking distance.
The system monitors the driver's braking habitsand increases braking force when necessary.Braking force can be increased up to the point atwhich the ABS intervenes. The function is deacti-vated when pressure on the brake pedal isdecreased.
Related information
Brakes (p. 431)