Sensor Output Waveforms



VVT Sensor Signal Plate (720 o CA)

VVT Sensor

6Go CA

l8Go CA

l2Go CA

l8Go CA

6Go CA

12Go CA





lGo CA



2) MRE Type VVT Sensor

• The MRE type VVT sensor consists of an MRE, a magnet and a sensor. The direction of the magnetic field changes due to the different shapes (protruded and non-protruded 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 Hi or Lo. The ECM detects the camshaft position based on this output voltage.

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


Sensor Type


Pick-up Coil

Signal Output

Constant digital output starts from low engine speeds.

Analog output changes with the engine speed.

Camshaft Position Detection

Detection is made by comparing the NE signals with the Hi/Lo output switch timing due to the protruded/non-protruded portions of the timing rotor, or made based on the number of the input NE signals during Hi/Lo outputs.

Detection is made by comparing the NE signals with the change of waveform that is output when the protruded portion of the timing rotor passes.

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