Specific to 1.8/2.0 L engines

These engines have fuel injection systems from another manufacturer, which work largely the same as in the 1.6 L engine. The differences are:

• The air drawn in by the engine is measured by a hot-film air mass meter. This measurement is more accurate than measurement via intake manifold vacuum. The intake air flows through the air mass meter.

  Inside the housing of the air mass meter is a thin, electrically heated plate, which is cooled by the intake air flowing past it.

  The control electronics regulate the heating current so that the plate temperature remains constant. For example, if the quantity of intake air increases, the heated component tends to cool down. The heating current is then immediately increased to keep the temperature constant. The control unit detects the engine load condition from the fluctuations in the heating current.

• 2.0 L engine: a variable camshaft timing control rotates the intake camshaft relative to the camshaft sprocket depending on engine speed and engine load, so that optimal valve timing is achieved with regard to torque curve and fuel consumption. An electrically operated valve is located next to the intake camshaft timing belt pulley.

  It is actuated by the control unit when the engine speed is above idle speed but below 4800 rpm and the accelerator is pressed (throttle valve angle above 8°). The camshaft is then rotated by 18° by engine oil pressure. The system is not activated at coolant temperatures below +40 °C.