Two volumes containing pages illustrations and diagrams pgs of electrical wiring diagrams Volkswagen Part No. For the professional automotive technician, this manual includes useful specifications and procedures. This manual also includes electrical system information, including the extra information that every professional needs, as well as basic instruction that takes the mystery out of electrical troubleshooting:.
Even the Volkswagen owner who has no intention of working on his or her own car will find that reading and owning this manual will make it possible to discuss repairs more intelligently with the professional technician. Page 70 Function diagram 1. Page 71 J Page 73 2.
Page 74 The principle of variable valve timing: The exhaust camshaft is driven by the With variable valve timing, the opening times of the inlet valves are adjusted depending on crankshaft by means of a toothed belt.
The drive chain therefore turns The inlet camshaft is driven by the exhaust the inlet camshaft. Page 75 2. Oil is supplied to the hydraulic cylinder via the engine oil circuit. The engine control unit controls the hydraulic cylin- der via the variable valve timing valve, which is bol- ted directly to the variable valve timer housing.
Page 76 Variable valve timing in the V6 engine Exhaust camshaft The design of the V6 engine makes particularly heavy demands on variable valve timing. Inlet camshaft Viewed from above, the exhaust camshafts are arranged on the outside and the inlet cams- hafts on the inside.
Page 77 2. V6 engine is equipped with variable valve timing and is controlled by the Motronic M 3. Page 78 Function diagram of 2.
Page 81 1. TDI Engine AFN Radiator fan run-on A radiator fan run-on facility controlled by the The run-on time is determined by the engine engine management system is being used in control unit via a characteristic map.
Allowance the 1. Page 82 Test your knowledge 1. V6 engine? Complete the following text. At low speeds, the piston moves so that the gas mixture in follows the movement of the piston. The inlet valve so that the fuel-air mixture is not forced back into the intake manifold. Page 83 Gearbox Magnesium Lightweight construction now plays a central Density comparison role in vehicle development, due to the tough Iron: demands on performance, safety and fuel 7.
Page 84 Electrochemical voltage series In the presence of water, an electric current An electrochemical voltage series is produced develops between two different metals. The by arranging the metals in a series extending car battery operates according to a similar from non-precious metal to precious metal.
Page 85 Gearbox Magnesium Contact corrosion, using a bolted connection Water as an example In this example, a magnesium component is attached using a bolt made is an iron alloy. If the contact surface is wetted with water, an electric current occurs between the two metals.
Page 86 Test your knowledge 1. What is the insertion depth for magnesium compared to that for iron? Assign the metals of gold, iron, magnesium, copper, aluminium and lead to the following drawing. Page 87 Drive shafts Triple roller constant velocity joint Triple roller joints are principally used in diesel The triple roller CV joint reduces the transmis- and automatic cars. Page 88 Function The principal task of the drive shafts is to transmit power from the gearbox to the wheels.
They are also responsible for length compensa- tion. At certain speeds, the unit begins to oscillate in its mountings. Torsion beam rear axle The anti-roll bar used in the new torsion beam rear axle is located in front of the axis of rotation. The centre of rotation is an imaginary axis about which the axle rotates when the suspension experiences a bump on one side. The twin-tracked ball bearing has a stationary outer race which is bolted to the rear l Minimal wear due to improved sealing.
Page 93 Running Gear Double wishbone rear axle The newly developed double wishbone rear The subframe is connected to the body by four axle allows the same through-loading width as large bonded rubber mountings. It has an enclosed subframe to which the transverse links are attached. Page 94 Test your knowledge 1. How is the high transverse rigidity of the torsion beam rear axle achieved? The V section of the new torsion beam rear axle is open 3.
The advantages of the new wheel bearing generation are as follows: a Minimal wear, b The ABS speed sensor rotor is protected, c It is self-adjusting, This means that two valves are assigned to each wheel inlet and outlet valves. The hydraulic unit and the ABS control unit are combined in a single module and can only be renewed as one unit. Redundant computer concept In this case, redundant stands for a computer This third computer is known as the watchdog. It generates signals contactlessly.
Signal utilisation The signal supplied by the ABS speed sensor is used to control the anti-lock braking system. Page Test your knowledge 1.
Page Electrics Gas discharge lamp In the case of gas discharge lamps, light is components due to the composition of the gas generated by an electric arc between two in the lamp tube. This is the external distinguishing feature of gas discharge technology.
Page Electrics The gas discharge lamp requires a high-voltage pulse of several thousand volts to ignite the elec- Gas discharge lamp tric arc. The voltage is produced in the ballast. After ignition, an increased electric current is applied to the gas discharge lamp for approx. Page Electrics Emergency operation: If an electrical fault occurs in the automatic head- light range control, the headlight range control actuator automatically sets the headlight to its lowest position.
The driver is alerted to the malfunction. Page Air-conditioning The Passat has an improved air-conditioning system. Refrigerant circuit The refrigerant in the evaporator absorbs heat The refrigerant is circulated in a closed circuit. Page Air-conditioning System overview Sensors Sunshine penetration photosensor G Dash panel insert temperature sensor G56 with temperature sensor fan V42 Outside temperature sensor Temperature sensor for fresh air intake duct G89 Sender for footwell air outlet tempera- ture G Sender for central air outlet temperature G Air-conditioning pressure switch The vacuum unit and two-way valve previously used are no lon- ger required.
Looking For Mechanical Information? Volkswagen Passat Service Manuals ». About The Volkswagen Passat The Volkswagen Passat nameplate began in as the German car manufacturer wanted to bring in a new large family car line. Passat Changes Over The Years Looking back at the original shape it is unrecognizable to the modern Passat with its sharp lines and uninspiring shape.
During its life, the car has been known by other names in certain regions around the world including: Volkswagen Dasher Volkswagen Quantum Volkswagen Santana Volkswagen Magotan in China Volkswagen Carat Volkswagen Corsar The most recent generation of releases called the B8 to represent its eighth-generation is targeted mostly to the European market with some sales in the USA.
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