Introduction to Maserati
Quattroporte
RPM sensor: The RPM sensor is a variable reluctance transducer (also known as a pick-up or inductive sensor) located in proximity of the tone wheel keyed to the crankshaft. The tone wheel has 58 (60-2) teeth. Resistance = 1134 ÷ 1386Ω (20°C). The prescribed gap between the tip of the sensor and the tone wheel to obtain correct readings is between 0.5 and 1.5 mm. The output voltage varies with the rotation speed.
Timing sensor: The timing sensor is a Hall-effect transducer fitted in correspondence with a tone wheel with four cams on the intake camshafts. In normal conditions the timing sensor output signal is 5V, but when the magnetic cam is aligned with the sensor the signal is lost, thereby informing the ECU of the position of the camshaft (the ECU reads the downward flanks of the timing signal) The timing sensor is an active transducer. This means that the position of the camshaft is recognised even when the engine is stopped. The timing signal is utilised to recognise the position of the engine and for the VVT system.
Maserati Academy
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