Crankshaft Position Sensor: Description and Operation

Fig. 1 Crankshaft Position Sensor:

Engine position is measured by the crankshaft position sensor (or TDC sensor) mounted below the rear of the crankshaft front pulley. This sensor provides one pulse every 360° of crankshaft rotation, indicating when the engine is at cylinder 1a TDC position. The camshaft position sensor (CMP) provides one signal every 720° of crankshaft rotation indicating No. 1 A cylinder at TDC prior to the firing stroke. These signals are used by the ECM to control fuel injection and ignition duration and synchronization.