Civic L4-1493cc 1.5L SOHC (8 valve) (1992)
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Crankshaft Position Sensor: Description and Operation
Top Dead Center/Crankshaft Position/Cylinder Position Sensors
The TDC/CYL/CRANK sensor, found inside the distributor housing, consists of the TDC sensor rotor, CRANK sensor rotor, their associated
pick-up coils, and a common shaft that is directly coupled to the camshaft. Because the shaft is coupled to the camshaft both sensors turn in time
with the engine. As the teeth on the sensors break the flux lines of their respective pick-up coils a voltage pulse is generated. These pulses are the
input signal to the engine control unit (ECU).
The CRANK sensor detects engine RPM and is also a primary input signal to the ECU for determining fuel injection timing and ignition of each
cylinder. The TDC Sensor determines ignition timing at start-up (cranking) and when crank angle signal is abnormal. The TDC sensor determines
the crankshaft position at top dead center. The magnetic sensor produces an alternating current generated by the rotary motion of the trigger wheel.
This signal is then sent to the ECU The Cyl sensor detects the position of No. 1 cylinder for sequential fuel injection to each cylinder.
