Nissan Trent crankshaft position sensor is located behind the engine block, above the right axle ball cage and below the exhaust pipe, and is covered by an iron cover. Crankshaft position sensor is one of the most important sensors in engine electronic control system. It provides ignition timing (ignition advance angle) and signals to confirm crankshaft position, and is used to detect piston top dead center, crankshaft angle and engine speed. The following is the relevant form of crankshaft sensor: 1. The magnetic pulse crankshaft position sensor is installed behind the pulley at the front end of the crankshaft. There is a thin circular toothed disc (called signal disc) with fine teeth at the rear end of the pulley, which is installed on the crankshaft together with the pulley and rotates with the crankshaft. 2. The photoelectric crankshaft position sensor is installed in the distributor. It consists of a signal generator and a signal disk with grooves and light holes. The light emitting diode is used as a signal source and rotates with the rotor. When the light-emitting hole is aligned with the light-emitting diode, light irradiates the phototransistor to generate an electrical signal, which is amplified by the amplifier circuit and then transmitted to the ECU. 3. Hall-type crankshaft position sensor, which uses Hall effect principle to generate voltage pulse signal corresponding to crankshaft angle. It uses trigger blades or gear teeth to change the magnetic field intensity passing through the Hall element, so that the Hall element generates a pulsed Hall voltage signal, which is amplified and shaped as the output signal of the crankshaft position sensor. Nissan Trent crankshaft position sensor is located behind the engine block, above the right axle ball cage and below the exhaust pipe, and is covered by an iron cover.