Description - Cylinder Head Components GTDI 2.0L Petrol: Camshafts

Two, one-piece cast camshafts are used. The exhaust camshaft is extended and protrudes through the end of the cylinder head. The extension has a three sided cam which drives the HP (high pressure) fuel pump.

Each camshaft has eight, high lift, short duration cam lobes which open and close the valves. A sensor ring is shrunk onto each camshaft and is used to determine the camshaft position. A CMP sensor, located in the camshaft cover above the sensor ring for each camshaft, senses the position of the camshaft and passes this information to the ECM. The ECM uses this information and position data from the CKP sensor to determine the current position of the crankshaft and camshafts. This is used for a number of engine functions including VCT operation and ignition timing.