SFI SYSTEM


  1. CONSTRUCTION


    1. Crank Position Sensor


      1. A pick-up type crankshaft position sensor is used to detect the engine speed and crankshaft angle.

      2. The timing rotor of the crankshaft consists of 34 teeth with 2 teeth missing. The crank position sensor outputs the crankshaft rotation signals every 10°, and the change of the signal due to the missing teeth is used to determine top-dead-center.

        A01CRZRE02
        *1 Crank Position Sensor Assembly
        *2 NE Signal
        *3 Timing Rotor

    2. Camshaft Position Sensor


      1. A Magnetic Resistance Element (MRE) type camshaft position sensor is used. To detect the camshaft position, a timing rotor that is part of the camshaft is used to generate 6 (3 high output, 3 low output) pulses for every 2 revolutions of the crankshaft.

        A01CS94C02
        *1 Camshaft Position Sensor *2 Camshaft
        *3 Timing Rotor - -

      2. The MRE type camshaft position sensor consists of an MRE, a magnet and a sensor. The direction of the magnetic field changes due to the profile (protruding and non-protruding portions) of the timing rotor, which passes by the sensor. As a result, the resistance of the MRE changes, and the output voltage to the ECM changes to high or low. The ECM detects the camshaft position based on this output voltage.

        A01CRURE16