ENGINE 1.3L QUADRAJET (90PS) 105 OPERATION A current-carrying semiconductor layer immersed in a normal magnetic field (force lines at right angles to current direction) generates a potential difference known as a Hall voltage at its terminals. If current intensity remains constant, the generated voltage depends on magnetic field intensity alone. Periodic changes in magnetic field intensity are sufficient to generate a modulated electrical signal with frequency proportional to the speed of magnetic field change. To produce this change, a tooth on the inner part of the pulley periodically moves close to the sensor. PIN_OUT Pin Description Signal type 1 Earth Earth 2 Timing signal Frequency output 3 Power supply 12 V input In the specific case of the timing sensor it receives a 5 Volt power supply from the engine management control unit. All the times the rotor passes in front of the sensor a variation in the actual sensor output voltage is produced through the Hall effect; this variation takes place for the entire duration that the rotor passes in front of the sensor after which the signal returns to the original value (5V). 10 ms 5 V 3 2 1
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