BITs January 2017 SR

ANY PART FOR ANY CAR OVER 200 BRANCHES NATIONWIDE Air Mass/Flow Sensors/Meters Mercedes C-Class, E-Class, S-Class Diesel M611 M612 00> Pierburg Air Mass Sensor £43 .99 434 22 0200 Jaguar XJ, Land Rover TDV6 03-10 VDO Air Flow Meter £72 .99 434 63 0120 conditions from freezing start up temperatures to high operating temperatures, moisture, dust and dirt. These extreme conditions often lead to failure at the most inconvenient time. But what’s the function of these components? What do they do within a vehicle’s engine management system? Air flow meter A mass air flow sensor (MAF) is used to measure the mass flowrate of air entering a fuel-injected engine. The air mass information is necessary for the engine control unit (ECU) to balance and deliver the correct fuel mass to the engine, creating the optimum fuel and air mixture to ensure the vehicle runs as efficiently as possible. Crankshaft position sensor A crank sensor is used to monitor the position or rotational speed of the crankshaft. This information is used by ECU to control the fuel injection or the ignition system timing and other engine parameters. The crank sensor can be used in combination with a similar camshaft position sensor to monitor the relationship between the pistons and valves in the engine, Y our local Euro Car Parts branch stocks a market-leading range of engine management, emission control and fuel management products. Make us your first call. Winter is the time of year when vehicle electrical components are under real pressure to perform. Many electrical parts work under extreme

which is particularly important in engines with variable valve timing. This method is also used to “synchronise” a four-stroke engine during start-up, allowing the management system to know when to inject the fuel. MAP sensor The manifold absolute pressure sensor (MAP Sensor) provides manifold pressure information to the engine’s ECU. This is used to calculate the air density and determine the engine’s air mass flow rate which in turn determines the required fuel metering for optimum combustion. Generally, a naturally aspirated engine will use either a MAF sensor or a MAP sensor, while a turbocharged engine typically uses both. Exhaust gas temperature sensor (EGTS) With emission standards becoming increasingly stringent, vehicle manufacturers are developing newer technologies to meet cleaner exhaust gas legislation. An EGTS measures temperatures in the exhaust system, typically up to 900°C. The resistance of the EGTS alters with any change in exhaust temperature. The change in resistance is registered by the ECU in order to control engine conditions and effectively reduce emissions. It also protects components located in the flow of hot exhaust gas from critical overheating.

Timely diagnosis and replacement of a defective EGTS prevents damage to the DPF and subsequent engine damage.

BMW 2.0, 2.5, 3.0 Diesel All Series 05-EU4 Bosch Air Mass Meter £124 .99 434 11 0637 Ford Transit Connect 1.8DI 2.2D 02> ERA Air Mass Meter £48 .99 434 59 0250

Renault Clio, Megane Volvo S40, V40 1.9DCI DTI 98> VDO Air Mass Sensor £67 .99 434 74 5000

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