Scoupe L4-1468cc 1.5L SOHC (8 VALVE) (1991)
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become conductive in the direction opposite to that of ordinary diodes, with the result that current flows as shown by the arrows in the crank angle and
#1 TDC sensor system images, and approximately 5v is applied to the comparator. When this happens, 5v is transmitted from terminal 2 to the ECU.
Because the light to the photo diodes is interrupted when the slit passes, the current shown by the broken line stops flowing, and terminal 2 becomes O
volts. In this way, then, the pulses from the unit assembly are sent to the ECU as signals.
#1 TDC Sensing System
No.1 Cylinder TDC Signal:
Top dead center is detected by the signal obtained through the one inner slit of the disc. The ECU, based upon this signal, determines which of the four
pulses from crank angle sensor is the signal for the #1 cylinder.
