engine warning light VOLKSWAGEN TRANSPORTER 2018 Owner's Guide

A WARNING (Continued)
• If the brake servo does not function or the vehicle is being towed, the brake pedal will have to be depressed more forcefully as the braking distance will be Increased due to the lack of assistance for the brake system.
CD
• Never let the brakes "rub" by applying light pressure to the brake when it is not necessary to brake. Continual pressure on the brake pedal will overheat the brakes. This can considerably reduce the brake effect, increase the braking distance and, In certain circumstances, cause the brake system to fail completely.
Brake support systems
r-f'n First read and observe the Introductory l..-Wl information and safety warnings&. on page 269.
The brake support systems ESC, ABS, BAS, TCS and EDL only function when the engine is running. They make a considerable contribution to active driving safety.
Electronic stability control (ESC)
The ESC helps to reduce the risk of skidding and to improve driving stability by braking individual wheels in certain driving situations. The ESC de-tects critical driving situations such as oversteer, understeer and wheelspin. The system helps to stabilise the vehicle through targeted application of the brakes or by reducing engine torque.
ESC has its limitations. lt is important to realise that ESC cannot overcome the laws of physics. ESC will not be able to assist in every situation faced by a driver. For example, ESC will not be able to assist every time that there is a sudden change in the road surface quality. If a section of dry road is suddenly covered with water, mud or snow, ESC will not be able to assist in the same manner as on a dry road. If the vehicle aquaplanes (drives on a layer of water rather than on the road surface), ESC will not be able to assist in steering the vehicle as the contact to the road surface has been interrupted and it is therefore no longer pos-sible to steer or brake the vehicle. When driving at speed through bends, particularly on stretches of road with many bends, the ESC will not always be able to process complicated driving situations as
2741 While dnvang
• Before driving down a long, steep gradient, reduce speed and change to a lower gear or move the selector lever to a lower position. This will make use of the engine braking effect and relieve the load on the brakes. The brakes could otherwise overheat and possibly fall. The brakes should only be used to slow or stop the vehicle.
m If the front brake pads are tested, the rear L!..J brake pads should be tested at the same time. Regularly check the thickness of the brake pads through the openings in the rims or from the underside of the vehicle. If necessary, remove the wheels to carry out a comprehensive check. Volks-wagen Commercial Vehicles recommends using a Volkswagen Commercial Vehicles dealership for this purpose. effectively as at lower speeds. When towing a trail-er, ESC is unable to assist the driver in regaining control over the vehicle.
Always adapt your speed and driving style to suit visibility, weather, road and traffic conditions. ESC cannot defy the laws of motion, improve the availa-ble power output, or keep the vehicle on the road if insufficient care and attention on the part of the driver causes the vehicle to leave the road. In-stead, the ESC improves the chances of keeping the vehicle under control and, in extreme on-road driving situations, exploits the driver's steering in-put to keep the vehicle travelling in the desired di-rection. If the vehicle is driving at a speed that leads it to leave the road before the ESC can pro-vide any kind of support, the ESC will be unable to provide any assistance.
The ASS, BAS, TCS and EDL systems are integra-ted into the ESC. The ESC is always on. If the trac-tion achieved in certain situations is not sufficient, TCS can be switched off by pressing the ASR (TCS) button =>Fig. 224. Always ensure that ASR (TCS) is switched back on again once traction is sufficient.
Automatic Post-Collision Braking System
In the event of an accident, the Automatic Post-Collision Braking System can help the driver to re-duce the risk of skidding, and the danger of secon-dary collisions, through automatic braking.

Brake fluid
B7E.02AO
Fig. 225 In the engine compartment: cap on the brake fluid container.
r-111 First read and observe the Introductory l-Jr:,U Information and safety warnings&. on page 269.
Brake fluid will gradually absorb water from the surrounding air. The brake system will be damaged if there is too much water in the brake fluid. The boiling point of the brake fluid is also considerably reduced by the water content. Heavy use of the brakes may cause a vapour lock in the brake sys-tem if the water content is too high. Vapour locks reduce levels of braking power, considerably in-crease braking distance and can even cause the brake system to fail completely. Your own safety and that of other road users depends on having a brake system that functions properly at all times
Brake fluid specification
Volkswagen has developed a brake fluid that has been optimised for the brake system in the vehicle. To ensure optimal operation of the brake system, Volkswagen Commercial Vehicles recommends the use of brake fluid compliant with VW stand-ard 501 14.
Before using a particular brake fluid, check that the specifications printed on the container correspond to the vehicle requirements.
Brake fluid that is compliant with VW stand-ard 501 14 is available from Volkswagen Commer-cial Vehicles dealerships.
If this brake fluid is not available and it is necessa-ry to use another high-quality brake fluid instead, brake fluid that is compliant with DIN ISO 4925 CLASS 4 or US standard FMVSS 116 DOT 4 can be used.
Not all brake fluids that are compliant with DIN ISO 4925 CLASS 4 or US standard FMVSS 116 DOT 4 have the same chemical com-position. Some of these brake fluids may contain chemicals that can damage or destroy brake sys-tem components over time.
To ensure sustained optimal operation of the brake system, Volkswagen Commercial Vehicles there-fore recommends the use of brake fluid that is compliant with VW standard 501 14.
Brake fluid that is compliant with VW stand-ard 501 14 fulfils the requirements of DIN ISO 4925 CLASS 4 or US standard FMVSS 116 DOT 4.
Brake fluid level
The brake fluid level must always be between the MIN and MAX marking of the brake fluid container or above the MIN marking &.
The brake fluid level cannot be checked accurately in all models as engine components may partially conceal the brake fluid container. If the brake fluid level cannot be read exactly, please go to a quali-fied workshop.
The brake fluid level drops slightly when the vehi-cle is being used as the brake pads wear and the brakes are automatically adjusted.
Changing the brake fluid
The brake fluid must be changed as indicated in the service schedule Service schedule. The brake fluid should be changed by a qualified workshop. Volkswagen Commercial Vehicles rec-ommends using a Volkswagen Commercial Vehi-cles dealership for this purpose. Only brake fluid that confonns with the required specification should be used.
A WARNING
Brake failure or reduced braking effect can be caused by the brake fluid level being too low or by brake fluid that Is too old or unsuitable.
• The brake system and brake fluid level must be checked regularly.
• The brake fluid should be changed regu-larly, according to the service schedule Service schedule.
• Heavy use of the brakes may cause a va-pour lock If the brake fluid Is left In the sys-tem for too long. Vapour locks reduce levels
Starting the engine, changing gear and parking I 277

Saving fuel
1/100 km
-10°C
+20 oc
L----------------tkm 5 15 25 30
en-o11S
Fig. 226 Fuel consumption in litres per 100 km at two different outside temperatures.
r-1"'11 First read and observe the Introductory Information and safety warnings&. on page 278.
By adopting an economical driving style and antici-pating the traffic situation ahead, you can easily re-duce fuel consumption by 10-15%.
Cars use most fuel when accelerating. If you think ahead when driving, you will need to brake less and thus accelerate less. Wherever possible, let the car roll slowly to a stop, for instance when you can see that the next traffic lights are red.
Avoid short journeys
Directly after a cold start, the engine has a very high fuel consumption. The engine reaches its working temperature after a few kilometres, when fuel consumption will return to a normal level.
The engine and catalytic converter need to reach their proper working temperature in order to mini-mise fuel consumption and emissions. The out-side temperature is a key factor.
The different rates of fuel consumption for the same distance at both +20"C (+68"F) and at -10"C (+14"F) are shown in Fig. 226.
Therefore, avoid making too many short journeys and car share whenever possible.
Under the same conditions, the vehicle will use more fuel in winter than in summer.
280 I While dnvmg
Not only is it illegal in some countries to "warm up" the cold engine by running it while the vehicle is stationary, it is also technically unnecessary and a waste of fuel.
Adjust the tyre pressure
The correct tyre pressure reduces rolling resist-ance and therefore also fuel consumption.
Ensure that any new tyres purchased have opti-mum rolling resistance.
Use low viscosity engine oils
Fully synthetic low viscosity engine oils reduce fuel consumption. Low viscosity engine oils decrease frictional resistance in the engine and spread bet-ter and more quickly, especially for cold starts. They are especially effective In vehicles that make alotofshortjourneys.
Always ensure that the engine oil level is correct and that you keep to the service intervals (oil change intervals).
When buying engine oil, always make sure it com-plies with engine oil norms and has been approved by Volkswagen Commercial Vehicles.
Avoid unnecessary loads
Lighter vehicles are more economical and have lower environmental impact. An extra 100 kg, for example, can increase fuel consumption by up to 0.311100 km.
Remove all unnecessary objects and loads from the vehicle.
Remove any unnecessary special equipment and accessories
The more aerodynamic a vehicle, the lower its fuel consumption. Special equipment and accessories, such as roof carriers or bicycle carriers, make the vehicle less aerodynamic.
You should therefore remove any special equip-ment and luggage carriers that are not in use, es-pecially if you are going to be driving at high speeds.

Steering
CJ:n Introduction
This chapter contains information on the following subjects:
Information on steering . . . . . . . . . . . . . . . . . . . 281
Additional information and warnings:
• Starting and stopping the engine 257
• Battery 362
• Tow-starting and towing 446
Information on steering
r--f"n First read and observe the introductory L-la.LI infonmation and safety warnings & on page 281.
Locking the steering wheel
• When the vehicle key has been removed, turn the steering wheel slightly until you hear the lock-ing pin engage.
The steering should be locked every time you leave the vehicle to make il more difficult for the vehicle to be stolen.
Unlocking the steering wheel
• Turn the steering wheel slightly to lake the load off the steering lock mechanism. Hold the steering wheel in this position and tu m the vehicle key clockwise out of position 217 @.
A WARNING
If the power steering is not working, the steering wheel is difficult to turn, which makes it difficult to steer the vehicle.
• The power steering only functions when the engine Is running.
• Never allow the vehicle to roll if the engine is switched off.
• Never remove the vehicle key from the ig-nition lock when the vehicle is in motion. The steering lock may be activated and you will no longer be able to steer the vehicle. Power steering
With power steering, the steering assistance is au-tomatically matched to vehicle speed, the steering wheel torque and the steering wheel angle. The power steering will only function when the engine is running.
You will need considerably more strength than nor-mal to steer the vehicle if lhe power steering is re-duced or has failed completely. Starting the engine, changing gear and parking I 281

Driver assist systems
Pull-away assist systems
cr:n Introduction
This chapter contains information on the following subjects:
Warning and indicator lamps . . . . . . . . . . . . . . 282
Start/stop system . . . . . . . . . . . . . . . . • . . . . . . . 283
Hill Hold Assist . . . . . . . . . . . . . . . . . . . . . . . . . . 284
Hill Descent Assist . . . . . . . . . . . . . . . . . . . . . . . 285
Rear axle differential lock . . . . . . . . . . . . . . . . . 286
Additional information and warnings:
• Volkswagen information system =>page 24
• Braking, stopping and parking =>page 269
• Battery =>page 362
• Wheels and tyres =>page 367
• Accessories, modifications, repairs and renewal of parts =>page 394
• Jump starting =>page 443
Warning and indicator lamps
A WARNING
The intelligent technology of the pull-away assist systems cannot overcome the laws of physics or system-related vehicle limitations. Never let the extra convenience afforded by pull-away assist systems tempt you into tak-ing any risks when driving-this can cause accidents.
• Unintentional vehicle movements can cause serious Injury.
• The pull-away assist systems cannot re-place the driver's full concentration.
• Always adapt your speed and driving style to suit visibility, weather, road and traffic con-ditions.
• Pull-away assist systems cannot hold the vehicle in all hill start situations or brake it sufficiently on all slopes going downhill (e.g. if the ground is slippery or icy). m First read and observe the introductory information and safety warnings & on page 282.
Lit up Possible cause
Rear axle differential lock switched on . ...
Hill Descent Assist switched on.
(A) The start/stop system is available, automat-ic engine stop is active.
ex;
The start/stop system is not available. OR: the start/stop system has switched off the engine automatically.
Flashes Possible cause
The rear axle differential lock cannot be .... switched on .
Hill Descent Assist is regulating.
Several warning and indicator lamps will light up briefly as a functional check when the ignition is switched on. They will go out after a few seconds. .,..
282 I While drivmg
Solution
=>page 286
=>page 285
=>page 283
Check whether all technical requirements have been fulfilled. If necessary, make sure that all technical requirements are fulfilled =>page 283.
Solution
=>page 286
=>page 285

• On vehicles with Climatronic: if the temperature inside the vehicle substantially increases or de-creases.
• When the vehicle starts rolling or brake support is required.
• If the voltage of the vehicle battery falls.
Conditions that necessitate a manual key start
The engine has to be started manually with the ve-hicle key in the following conditions:
• If the driver unfastens their seat belt.
• If a vehicle door is opened.
• If the bonnet is opened.
Switching the start/stop system on and off manually
• Press the @ button in the centre console 227.
• If the start/stop system has been deactivated, the indicator lamp in the button lights up.
The engine will start immediately if the vehicle Is In stop mode when the system is switched off man-ually with the @ button.
Hill Hold Assist
r--T'n First read and observe the Introductory L-I=JJ information and safety warnings & on page 282.
A WARNING
The brake servo and the power steering will not function If the engine Is switched off.
• Never allow the vehicle to roll if the engine is switched off.
• The start/stop system must be switched off if work Is to be carried out In the engine compartment.
CD
If the start/stop system Is used in very high outside temperatures over a long period, the vehicle battery can be damaged.
m In some cases. it will be necessary to restart L!J the engine manually with the vehicle key. Fol-low any corresponding messages on the instru-ment cluster display.
m At low speeds, the engine can be started L!J again if it has stalled by immediately pressing the clutch pedal. The Hill Hold Assist function actively
holds the vehicle when pulling away on
an incline.
The Hill Hold Assist function is automatically activated if the following conditions are met
Points 1 to 3 must be fulfilled at the same time·
Manual gearbox DSG® dual clutch gearbox
1. On an incline, the stationary vehicle must be held in position with the footbrake until the vehicle starts moving.
2. The engine is running smoothly.
3. The driver door is closed.
4. Fully depress the clutch pedal and move the gear stick to the first gear position if you want to The driving mode R, D or S has been selected. drive forwards up a hill or to the R position if you want to reverse up a hill.
In order to start moving, remove your foot from To start moving, remove your foot from the brake the brake pedal, then simultaneously release the pedal and press the accelerator immediately. clutch pedal (the clutch engages) and press the The brake will gradually be released as the accelerator. The brake will gradually be re-vehicle pulls away. leased as the clutch Is engaged.
284 I While driving

The Hill Hold Assist function will be deactivated immediately:
Manual gearbox I DSG® dual clutch gearbox
1. As soon as one of the conditions indicated on page 284, The Hill Hold Assist function is automati-cally activated if the following conditions are met is not fulfilled.
2. If the vehicle does not pull away within 2 seconds.
3. If the engine is not running smoothly or there is an engine fault.
4. If the engine is switched off or has stalled. I If the engine is switched off.
Hill Descent Assist
Fig. 228 In the centre console: button for switch-ing the Hill Descent Assist on and off.
l"'""'('n First read and observe the Introductory L-W.I Information and safety warnings & on page 282.
The Hill Descent Assist system supports
the driver when driving down a steep in-
cline by actively braking the vehicle.
The Hill Descent Assist reduces the engine speed and brakes actively so that the vehicle travels con-stantly at walking speed =>&.
The requirement for regulation is, among other things, that the ground allows enough grip. The Hill Descent Assist system cannot fulfil its function when driving down an icy or slippery slope.
Hill Descent Assist is regulating
• If the Hill Descent Assist is switched on using the button and the indicator lamp lights up.
• AND: the speed is less than 30 km/h (19 mph).
• AND: the gradient is at least 10%.
• AND: if the accelerator and brake are not de-pressed.
• AND: if the engine is running.
Regulation is stopped if the vehicle is accelerated or braked by the driver during regulation. The regu-lation restarts once the requirements are met again.
Hill Descent Assist does not regulate
• If the gradient is less than 10%.
• OR: The speed is greater than 30 km/h (19 mph).
• OR: If the driver brakes or accelerates.
A WARNING
Always be prepared to brake the vehicle. Ac-cidents and Injuries could occur if this is not ensured.
• The Hill Descent Assist system is only a support function and may not be able to brake the vehicle sufficiently In all situations when driving downhill.
• The vehicle may accelerate despite the Hill Descent Assist system.
Switching the Hill Descent Assist on and off
• To switch the Hill Descent Assist on, press the @=>Fig. 228 button in the centre console at speeds under approximately 30 km/h (19 mph). The indicator in the instrument cluster dis-play lights up. The indicator lamp flashes when the Hill Descent Assist system is applying the brake.
r::l The Hill Descent Assist system also works if W you reverse down a slope. • Press the button@ =>Fig. 228 in centre con-sole again to switch off the Hill Descent Assist. The indicator lamp in the instrument cluster display is switched off.
Driver assist systems 285

Rear axle differential lock
OSG-0041
Fig. 229 On the dash panel: button for rear axle differential lock
i""('n First read and observe the introductory information and safety warnings & on page 282.
If the rear-axle differential lock is switched on, the vehicle has better traction on difficult ground and
Switching the rear axle differential lock on
and off
• To switch the rear axle differential lock on, press the 229 button on the dash panel at speeds under approximately 45 krnlh (28 mph) The indicator lamp r. lights up in the instru-ment cluster.
• Press button , Fig. 229 in dash panel again to switch off the rear-axle differential lock. The indica-tor lamp r. in the instrument cluster goes out.
If the engine is switched off with the rear axle dif-ferential lock switched on, the rear axle differential lock remains switched on for roughly another 30 seconds.
Not switching the rear axle differential lock on
• If you are driving on well-surfaced roads &.
• If the vehicle is being towed.
• If the brakes are being tested on a rolling road test bed.
286 I While dnving
Rear-axle differential lock cannot be switched on
The rear axle differential lock cannot be switched on in the following situations:
• if there is a large difference in the speed of ro-tation of the rear wheels
• if the drive train is loaded heavily
• If the mechanical teeth of the rear-axle differen-tial lock are '1ooth to tooth": the indicator light r. in the instrument cluster flashes.
A WARNING
Never switch the rear axle differential lock on If you are driving on a solid road surface, the vehicle is being towed or if the tyres have no traction.
• Your steering will be greatly Impaired when the rear axle differential lock has been switched on. This could mean that you lose control over the vehicle and cause serious In-juries.
CD
Switching the rear axle differential lock on while being towed can damage the drive train.
m If the rear axle differential lock is switched off W when driving through a bend, this may cause a small shudder to go through the vehicle. This is caused by the release of wind-up in the drive train. This is normal and is not a indication of damage to the vehicle.
m If you drive through bends with the rear axle W differential lock switched on, the wheels "rub" on the road surface. You might be able to hear this. The ''rubbing" of the tyres -especially on solid ground -will lead to increased wear on the tyres.

m If the cooling system is switched off. the out-W side air that is drawn into the vehicle is not dehumidified. To prevent the windows misting over, Volkswagen Commercial Vehicles recommends that you leave the air conditioning (air conditioning co'!!E.'"essor) switched on. To do this, press the @ button. The indicator lamp in the button must light up.
m Maximum heat output, which is needed to de-W frost the windows as quickly as possible, is only available when the engine has reached its op-erating temperature.
Controls for Climatic
Fig. 254 In the centre console: Climatic controls
m Keep the air intake slots in front of the wind-W screen free of snow, ice and leaves to ensure heating and cooling is not impaired, and to prevent the windows from misting over. !en-o191
Fig. 255 In headliner of the passenger Climatic controls for the passenger compartment. In the centre console [ID: controls of the heating and fresh air system for the passenger compartment.
ill1 First read and observe the Introductory l..-Wl information and safety warnings & on page 322.
Press the corresponding button to switch a func-tion on or off. Press the button again to switch the function off.
Illuminated LE Os in the controls indicate whether a particular function is active. .,.
Air conditioning system I 323

Button, Additional information. Climatic '*Fig. 254 and '*Fig. 255. control
CD Temperature .
••••• Turn the regulator to set the temperature as required.
@ Blower. Setting 0: blower and Climatic are switched off. Setting 4: maximum blower setting.
Air distribution. @ Front infinitely adjustable. Passenger compartment: Can be adjusted manually with the buttons.
® Air distribution to the windscreen. In this position, the air re circulation mode is switched off
automatically, or not switched on at ail .
.. 0 ;;;o Air distribution to the upper body via the air vents In the dash panel.
Air distribution to the footwell.
@o •;;JJ Air distribution to the windscreen and the footweii.
gp Passenger compartment: air distribution to the side windows.
AC Press the button to switch the cooling system on or off.
QW Rear window heating: only functions when the engine is running and switches off automati-
cally after approximately 10 minutes.
Only for vehicles with controls in the roof of the passenger compartment: enabling or REAR disabling controls in the passenger compartment. An indicator lamp in the button lights up
when a control is enabled.
Air recirculation mode =-page 330.
Switch off. I Turn the blower switch to setting 0.
A WARNING
Stale air can quickly make the driver tired and affect their concentration, which in turn can cause collisions, accidents and serious Inju-ries.
324 I While drivmg
A WARNING (ConUnued)
• Never switch off the blowers or switch on the air recirculation mode for an extended pe-riod as this prevents fresh air from entering the vehicle interior.