Facet® 8.2744 Distributor Ignition Pickup Coil

RPM sensors are normally installed near a phonic wheel, also called flywheel.
They detect the variations of the magnetic flow produced by the alternation between the presence and absence of the tooth or cam of the flywheel which generate an electrical signal. This signal is sent to the engine control unit whereby, depending on the phonic wheel where the sensors are installed, the detected signal indicates:
• The revolving speed of the drive shaft (Crankshaft Rotational-speed Sensors)
• The top dead center by detecting the position of the drive shaft (Crankshaft Position Sensors)
• The ignition sequence/timing by detecting the position of the camshaft (Camshaft Position Sensors)
Connectors may have 2 terminals (variable reluctance sensors) or 3 terminals (Hall effect sensors) or, if there is an interference suppression, 3 (variable reluctance sensors) or 4 terminals (Hall effect sensors).
The main reasons for failures in the product are:
• deformation and dents
• de-magnetisation
• sensor overheating
• lack of signal, broken wire from chafing or excessive vibration, short circuit, internal breakage
• infiltrations of liquids or impurities through poor sealing.
The signs of malfunctions of the sensor are indicated by illumination of the engine warning lamp, difficulty in starting the vehicle, high fuel consumption, increased exhaust gas emissions.
RPM sensors are designed and assembled to withstand the critical installation conditions inside the engine compartment. In particular, the following requirements shall be met:
• Operating temperature: -40°C ÷ +150°C
• Degree of protection: IP67 (entrance of dust not allowed and protection against water immersion effects for 30 minutes).