engine warning light VOLKSWAGEN TRANSPORTER 2018 Service Manual

Button, Additional information. Climatronlc 256 and 257. control
.. 0 Air distribution on the upper body via the air vents in the dash panel or in the headliner in ;;;o the passenger compartment.
!J Air distribution to the footwetl.
tTIJ Passenger compartment: air distribution to the side windows.
dlrlb compartment: defogging the side windows. Press button RWI and then button to activate the function from the front.
Automatic air recirculation mode 330.
w Windscreen heating: only functions when the engine is running and switches off automati-cally after approximately 10 minutes.
qw Rear window heating: only functions when the engine is running and switches off automati-cally after approximately 10 minutes.
Automatic temperature, blower and air distribution control. Press the button: the AUTO High function (high blower output) is switched on. The right-AUTO hand indicator lamp in the button lights up. Press the button again: the AUTO Low function (low blower output) is switched on. The left-hand indicator lamp in the button lights up.
A/C Press the button to switch the cooling system on or off.
Press the button to achieve maximum cooling. The air recirculation mode and cooling sys-tern are switched on automatically, and air distribution is automatically set to position ;D.
Switch off. Press the OFF button@ or manually set the blower to 0. An indicator lamp in the@) button lights up when the system is switched off.
Press the button to readjust the air conditioning settings for the rear seats. The displays REAR then show the settings for the rear seats. Press the button again or do not press any button for approximately 10 seconds in order to switch the function off.
Use residual heat. If the ignition is switched off and the engine is warm, the residual heat
REST from the engine is used to continue to heat the vehicle interior. The function switches off at-ter 30 minutes or when capacity is low. Press button@!] and then button RWI to use the residual warmth in the passenger compartment.
the driver-side temperature settings to all seats: if the indicator lamp in the button is lit up, the driver-side temperature settings also apply to the other seats. Press SYNC the button or activate the temperature regulator for the passenger side or the rear seats to set different temperatures for the passenger side and the rear seats. The indicator lamp in the button is not lit up.
A wARNING A WARNING (Continued)
Stale air can quickly make the driver tired and affect their concentration, which in turn can cause collisions, accidents and serious inju-ries.
326 I While driving
• Never switch off the blowers or switch on the air recirculatlon mode for an extended pe-riod as this prevents fresh air from entering the vehicle interior.

Settings for optimal road visibility
• Switch off air recirculation mode 330.
• Set blower® to level 1 or 2.
• Set the temperature selector G) to the required position.
• Open and position all vents on the dash panel.
• Turn the air distribution Fig. 258 0 to the desired position.
Rear window heating
A button for the rear window heating @ may be contained in the dash panel.
• When the engine is running, press the @ but-ton to switch on the rear window heating.
• The rear window heating is switched off auto-matically after approx. 10 minutes. To switch it off before the automatic switch-off, press the(!) but-ton again.
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.
• Never switch off the blowers or switch on the air recirculatlon mode for an extended pe-riod as this prevents fresh air from entering the vehicle Interior. Information on the air conditioning system
.........r'n First read and observe the Introductory L-.lr:.ll Information and safety warnings & on page 322.
The cooling system for the vehicle interior only works when the engine is running and the blower is switched on.
The air conditioning system operates most effec-tively with the windows and the sliding/tilting roof closed. However, if the vehicle has heated up after standing in the sun for some time, the air inside can be cooled more quickly by opening the win-dows and the sliding/tilting roof for a short time.
Settings for optimal road visibility
Switching the cooling system on not only reduces the temperature of the vehicle interior, but also the humidity. This improves comfort for the vehicle oc-cupants and prevents the windows from misting when the outside humidity is high.
Climatic
• Switch off air recirculation mode 330.
• Set the blowers to the required level.
• Set the temperature to +22•c (+72.F).
• Open and position all vents on the dash panel 329.
• Turn the air distribution controller to the desired position.
• Press the@) button to switch the cooling sys-tem on. The indicator lamp in the button lights up.
328 I While driving
Cllmatronlc
• Press button.
• Set the temperature to +22•c (+72.F).
• Open and position all vents on the dash panel 329.
The cooling system cannot be switched on
The following criteria may prevent the cooling sys-tem from being switched on:
• The engine is not running.
• The blower is switched off.
• The air conditioning system fuse has blown.
• The ambient temperature is lower than approxi-mately +3"C (+38°F).
• The compressor has been temporarily switched off because the coolant temperature is too high.
• There is a different fault in the vehicle. The air conditioning system should be checked by a quali-fied workshop.
Things to note
If the humidity and temperature outside the vehicle are high, condensation can drip off the evaporator in the cooling system and form a pool underneath the vehicle. This is normal and does not indicate a

A WARNING (Continued)
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-Please ensure that the spare fuel can is· ter corresponds with the Industry stand· ard, for example AN SI or ASTM F852-86.
• Remove split fuel from all vehicle compo· nents as quickly as possible In order to avoid damage to the wheel housing, tyres and vehicle paint.
• • Filling up with petrol in a vehicle fitted with a diesel engine or refilling with diesel in vehicle equipped with a petrol engine can cause seri· ous ands expensive engine damage and dam· age to the fuel system that is not covered by
Indicator lamps and fuel gauge
Fig. 269 In the instrument cluster: fuel gauge for petrol and diesel.
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any Volkswagen Commercial Vehicles guaran· tee. Do not start the engine under any circum-stances if you have refilled using the Incorrect fuel. Seek expert assistance. The substances In these fuels can cause serious damage to the fuel system and to the engine itself if it Is switched on.
• Vehicles with a diesel engine should under no circumstances be filled and driven with pet· rol, kerosene, heating oil or any other fuels that have not been expressly approved for diesel engines. Other fuels could cause extensive and expensive engine damage and damage to the fuel system which will not be covered by any Volkswagen Commercial Vehicles guarantee.
r.:Gh Fuels can pollute the environment. Any spilt W service fluids must be cleaned up and dis· posed of properly. il'"'n First read and observe the introductory information and safety warnings & on page 340.
Lit up Needle position Possible cause & Solution 269
b Red marking (arrow) Fuel tank almost empty. Fill the tank as soon as possible Reserve is used up 343.
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.
When the Indicator lamp Blllghts up, the supple-mentary heating system and fuel-powered supple-mentary heater switch off automatically.
A WARNING
Driving the vehicle when the fuel level is too low could lead to your vehicle breaking down In traffic, accidents and serious injuries.
• When the fuel level is too low, the fuel supply to the engine could be Irregular, espe-cially when driving up or down hills and in-clines. .,..
At the filling station 341

Capacities
r--('n First read and observe the introductory L-W.I information and safety warnings & on page 340.
Checks when filling the tank
r--r'n First read and observe the introductory L-W.I information and safety warnings & on page 340.
Checklist
Never carry out any work on the engine or in the engine compartment if you are not familiar with the necessary procedures and the general safety re-quirements or if the correct operating equipment, fluids and unsuitable tools are not available 350, Preparation for working in the engine compartment! The work should be carried out by a qualified workshop if you are uncertain. Please en-sure that the following are checked regular1y, pref-erably every time you fill the tank:
..( Windscreen washer fluid level 116
..( Engine oil level 353
Fuel
c:QJ Introduction
This chapter contains information on the following subjects:
Petrol
Diesel ...
344 345
Different engines require different fuels. The facto-ry-fitted sticker on the inside of the tank flap indi-cates the fuel type that is required for your particu-lar vehicle.
Volkswagen Commercial Vehicles recommends us-ing fuels with a low sulphur content or which are sulphur-free in order to reduce fuel consumption and prevent damage to the engine.
If the engine is not running smoothly or begins to judder, this can indicate poor or inadequate fuel quality, e.g. water in the fuel. If these symptoms appear, reduce the vehicle speed immediately and drive to the nearest qualified workshop at medium engine speeds, avoiding high engine loading. If these symptoms occur immediately after the vehi-
Fuel tank capacity
Approx. 80.0 I,
..( Engine coolant level 358
..( Brake fluid level 269
..( Tyre pressure 367
..( Vehicle lighting necessary for traffic safety:
-Turn signals
-Side lights, dipped beam headlights and main beam headlights
-Tail light cluster
-Brake lights
-Rear fog light 1 08
Information on changing bulbs 432.
cle has been refuelled, switch the engine off as soon as it is safe to do so and seek expert assis-tance. This can help to prevent further damage.
Additional information and warnings:
• Filling the tank 340
• Engine management system and exhaust puri-fication system 407
• Service schedule
A WARNING
Incorrect handling of fuel can cause explo-sions, fire, serious burns and other injuries.
• Fuel is highly explosive and inflammable.
• Never handle fuel near open flames, sparks or glowing matter (e.g. cigarettes).
• Keep naked flames, hot parts and sparks at a safe distance.
At the filling station 1343

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• Your vehicle is not suitable for use with bio-diesel and must not be filled up or driven with biodiesel. Failure to observe this point can re-sult in damage to the fuel system and engine.
• Some diesel manufacturers blend biodiesel with diesel fuel in compliance with European Standard 590 or an equivalent standard (in Ger-many). Use of this diesel is allowed and will not damage the engine or fuel system.
• The diesel engine has been developed for use with diesel only. For this reason, petrol, heating oil or other unsuitable fuels may not be used. These fuels can cause serious damage to the fuel system and engine.
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• The service life of the diesel particulate filter can be reduced considerably if diesels with a high sulphur content are used. A Voikswagen Commercial Vehicles dealership will be able to tell you which countries have diesel with a high sulphur content. Emission control system for diesel vehicles (AdBiue®)
o:::n Introduction
This chapter contains information on the following subjects:
Warning and indicator lamps Refilling Ad Blue® ... 347
348
SCR catalysts can be used to reduce emissions from diesel engines (SCR = Selective Catalytic Re-duction). The SCR catalyst uses Ad Blue® urea sol-ution to convert nitrogen oxides into nitrogen and water.
If the vehicle is equipped with this kind of emission control system for diesel vehicles, the filler neck for the Ad Blue® tank is located below the filler cap for the fuel tank.
The Ad Blue® level should be checked within the scope of the service work Service schedule.
Information on AdBiue®
The Ad Blue® consumption figures depend on the individual driving style, the system's operating tem-perature and the ambient temperature that the ve-hicle is operated in.
The vehicle is fitted with a separate tank for Ad Bl-ue®. The Ad Blue® tank holds approximately 13 li-tres. For technical reasons, the capacity may be slightly larger when refilling using refill bottles.
The Ad Blue® tank must never run empty. As of a remaining distance of approximately 2,400 km. the instrument cluster display will indicate that the
346 While drivmg
Ad Blue® must be refilled 348. If the re-maining range is 0 km, the engine cannot be star-ted anymore 347.
The Ad Blue® trademark is held by the German As-sociation of the Automobile Industry (VDA) in the USA, Germany, the European Union and other countries.
Additional information and warnings:
• Fuel 343
• Accessories, modifications, repairs and renewal of parts 394
A WARNING
If the AdBiue® level is too low, the vehicle cannot be restarted after the Ignition has been switched off. Starting with jump leads is also not possible.
• Refill AdBiue® at the latest when the re-maining distance reaches approximately 1,000 km.
• Never allow the Ad Blue® tank to run emp-ty.
A WARNING
Ad Blue® is an Irritant and corrosive fluid that can damage the skin, eyes and breathing passages upon contact.

A WARNING (Continued)
• If Ad Blue® gets Into the eyes or onto the skin, Immediately wash the area with lots of water for at least 15 minutes and consult a doctor.
• If Ad Blue® is swallowed, Immediately rinse the mouth out with lots of water for at least 15 minutes. Do not induce vomiting un-less Instructed to do so by a doctor. Seek medical assistance Immediately.
Warning and indicator lamps
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Ad Blue® can corrode surfaces such as painted vehicle parts, plastics, clothing and carpets. Remove any spiltAdBiue® as quickly as possi-ble with a damp cloth and plenty of cold water.
• If the Ad Blue® has already formed crystals, use warm water and a sponge to remove. m First read and observe the Introductory Information and safety warnings & on page 346.
Lit up Possible Solution
OG The engine cannot be restarted! AdBI-Park the vehicle in a suitable. flat location and refill the minimum amount of Ad Blue® ue® level too low. 348.
OG
with The engine cannot be restarted! Fault in the Ad Blue® system. Go to a qualified workshop. Have the system checked.
,.,..,c
Ad Blue® level is low. Refill Ad Blue® before the kilometres displayed
r drop to zero 348.
with Ad Blue® system faulty or not refilled using norm-standard Ad Blue®_ Go to a qualified workshop. Have the system checked.
,.,..,c
OG Ad Blue® level is low. Refill Ad Blue® before the kilometres displayed drop to zero 348.
OG
with Ad Blue® system faulty or not refilled using Go to a qualified workshop. Have the system norm-standard Ad Blue®.
,.,..,c
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.
A WARNING
Failure to observe illuminated warning lamps and text messages can lead to your vehicle breaking down in traffic, and can cause acci-dent and serious injury.
checked.
A WARNING (Continued)
• Never ignore any illuminated warning lamps or text messages.
• Stop the vehicle as soon as possible and when safe to do so.
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Failure to observe illuminated Indicator lamps and text messages can lead to your vehicle be-Ing damaged. At the filling station 347

Before continuing the journey
• After refilling, switch on the ignition only.
• Leave the ignition switched on for at least 30 seconds to allow the system to detect the refill procedure.
• Do not start the engine until the 30 seconds have elapsed!
Filling at low temperatures
Ambient temperatures below -11 •c (12.F) may af-fect the filling process.
If the Ad Blue® is frozen and the warning lamp lights up, it may not be possible the complete the filling procedure. Leave the vehicle at a warmer lo-cation until the Ad Blue® is liquid again, or have a qualified workshop fill the Ad Blue®.
A WARNING
Ad Blue® should only be kept In sealed origi-nal containers In a safe place.
• Never store Ad Blue® In empty food con-tainers, bottles or any other non-original con-tainers as people finding these containers may not know that they contain Ad Blue®.
• Ad Blue® must be stored out of the reach of children.
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• Only use Ad Blue® which complies with the ISO 22241-1 standard and which Is still in its original packaging.
• Never mix water or additives with Ad Blue®. Any damage caused by mixing in water or addi-tives would not be covered by the factory war-ranty.
• Never fill AdBiue® In the diesel tank! Failure to do so can result In engine damage.
• Only refill Ad Blue® into its own tank. Never fill AdBiue® In the diesel tank! Failure to do so can result In engine damage.
• Do not transport the refill bottle in the vehi-cle habitually. The bottle may develop a leak following changes In temperature and damage and the Ad Blue® may damage the vehicle Inte-rior.
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Do not continue filling the tank once the filler nozzle stops automatically. The Ad Blue® tank may have been overfilled and AdBiue® could leak out.
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When filling with an Ad Blue® filler nozzle, you may notice an odour.
The refill bottle must be disposed of in ac-"'7!1S cordance with regulations governing the pro-tection of the environment.
r::l Suitable Ad Blue® refill bottles are available L!J from a Volkswagen dealership. At the filling station 1349

Warning lamp and coolant temperature display
Fig. 276 In the instrument cluster: coolant temper-ature display with cold range @, normal range ® warning range @.
Needle posi-Lit up tion Possible cause =>Fig. 276
© Coolant temperature too Warning area high.
® Coolant level too low. Normal area
r-f"n First read and observe the introductory L,....J.:.lJ Information and safety warnings & on page 358.
In normal driving conditions, the needle will be in the middle section of the scale. The temperature may also rise when the engine is working hard, es-pecially at high ambient temperatures.
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.
Solution
t Do not drive on! Stop the vehicle as soon as possible and when safe to do so. Stop the engine, let the engine cool down until the needle is back in the normal area. Check the coolant level =>page 361.
After the engine has cooled down, check the coolant level and refill engine coolant if the level is too low =>page 361. There is a fault if the coolant level is correct.
Fault in the coolant system. ·t Do not drive on! --Seek expert assistance.
--® Cold area --
Flashes Possible cause
Fault in the coolant system.
A WARNING
Failure to observe illuminated warning lamps and text messages can lead to your vehicle breaking down In traffic, and can cause acci-dent and serious injury.
• Always heed illuminated warning lamps and text messages.
Avoid high engine revs and heavy engine loads until the engine is warm.
Solution
Seek expert assistance.
A WARNING (Continued)
• Never ignore any illuminated warning lamps or text messages.
• Stop the vehicle as soon as possible and when safe to do so.
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Failure to observe illuminated indicator lamps and text messages can lead to your vehicle be-ing damaged. In the engine compartment I 359

Checking the coolant level and refilling coolant
Fig. 277 In the engine compartment: markings on the coolant expansion tank.
r--f'n First read and observe the Introductory information and safety warnings & on page 358.
The warning lamp for the engine coolant will light up if the engine coolant level is too low.
Preparation
• Park the vehicle on a firm and level surface.
• Allow the engine to cool down &.
• Open the bonnet&. 350.
• The coolant expansion tank has the all. symbol on its cap 278.
Checking the coolant level
• When the engine is cold, check the coolant lev-el on the side markings of the engine coolant ex-pansion tank 277.
• Refill the coolant if the liquid level is below the minimum marking ("min"). When the engine is warm, the coolant level may be slightly above the top end of the marked area.
Refilling coolant
• Always protect your face, hands and arms from hot coolant or steam by placing a suitable cloth on the cap of the coolant expansion tank.
• Unscrew the cap carefully &.
• Refill only new coolant according to the Volks-wagen specification 360)
• Only top up coolant if there is coolant residue in the expansion tank. If this is not observed, the en-gine could be damaged. If you cannot see any coolant in the expansion tank do not drive on. Seek professional assistance.
Fig. 278 In the engine compartment: coolant ex-pansion tank cap.
• If you can see coolant residue in the expansion tank, top up coolant until the level remains stable.
• The coolant level must be between the marks on the engine coolant expansion tank 277. Do not fill up over the top line of the marked area
• Close the cap tightly.
• If in an emergency you do not have access to the coolant of the required specification 360), do not use any other coolant addi-tive. Instead, initially refill with distilled water only. Then add the correct proportion of coolant ad-ditive as soon as possible 360.
A WARNING
Hot steam or engine coolant can cause seri-ous burns.
• Never open the bonnet if you can see or hear steam or engine coolant coming out of the engine compartment. Always wait until no escaping steam or coolant can be seen or heard.
• Always allow the engine to cool down completely before carefully opening the bon-net. Hot components can burn the skin.
• The following points should be noted be-fore opening the bonnet once it has cooled down.
-Apply the handbrake fully and move the selector lever to position P or move the manual gear lever to the neutral position.
-Remove the vehicle key from the lgni-
In the engine compartment I 361

Explanation of the warnings on the vehicle battery
Symbol Meaning
Always wear eye protection!
Electrolyte is very corrosive and caustic. Always wear protective gloves and eye protection!
No fires, sparks, naked lights or smoking!
A highly explosive mixture of gases is given off when the vehicle battery is charging!
Always keep children away from acid and the vehicle battery!
Additional information and warnings:
• Additional batteries, California 192
• Pull-away assist systems (starUstop system) 282
• Preparation for working in the engine compart-ment 350
• Accessories, modifications, repairs and renewal of parts 394
• Service schedule
A WARNING
Any work on the vehicle battery and the elec-trical system can cause serious chemical burns, fire or electric shocks. Always read the following warnings and safety informa-tion before carrying out any kind of work:
• Switch off the ignition and all electrical consumers before carrying out any work on the vehicle battery and also disconnect the negative cable from the vehicle battery.
• Children should always be kept away from electrolyte and the vehicle battery.
• Always wear eye protection.
• Electrolyte Is very aggressive. lt can burn the skin and can cause blindness. When working with the battery, ensure that your hands, arms and face in particular are protec-ted from acid spillages.
A WARNING (Continued)
• Do not smoke during the work, and never work near naked flames or sparks.
• When handling cables and electrical equipment, avoid generating sparks and elec-trostatic charge.
• Never short circuit the battery poles.
• Never use a damaged vehicle battery. it can explode. Damaged vehicle batteries must be replaced as soon as possible.
• Damaged or frozen vehicle batteries must be replaced immediately. Discharged vehicle batteries can even freeze at temperatures of around ooc (+32°F).
• In vehicles with a second battery under the driver's seta or a third battery in the lug-gage compartment, ensure that the gas dis-charge hose is connected properly to the ve-hicle battery.
• Do not allow direct sunlight onto the vehicle battery for an extended period as the UV rays could damage the battery housing.
• If the vehicle is left standing in cold condi-tions for a long period, protect the vehicle bat-tery from frost. If it freezes it wilt be damaged.
• Vehicles with a starUstop system are fitted with a special vehicle battery. The installation of a different vehicle battery could cause prob-lems with the vehicle electronics. When replac-ing the vehicle battery, only insert a battery with specifications that correspond exactly with those of the original battery.
W After starting the engine with a discharged L!J vehicle battery, or after the battery has been changed, system settings (time, date, personal convenience settings and programming) may have been changed or deleted. Check and correct the settings as necessary once the vehicle battery has been sufficiently charged. In the engine compartment 363