СИСТЕМА ECD


  1. CONSTRUCTION


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

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      *1 Timing Sprocket
      *2 Camshaft Position Sensor
      *3 G Signal

    2. The MRE type sensor consists of an MRE, a magnet and a sensor.

    3. 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 crankshaft and camshaft positions based on this output voltage.

    4. The differences between the MRE type sensor and the pick-up coil type sensor used on the conventional models are as follows:


      • The MRE type sensor outputs a constant level of high and low digital signals regardless of the engine speed. Therefore, the MRE type sensor can detect the positions of the crankshaft and camshaft at an early stage of cranking.

      • The pick-up coil type sensor outputs analog signals with levels that change with the engine speed.

      Figure 1. MRE Type and Pick-up Coil Type Output Waveform Image Comparison

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